CN118711713B - Method for predicting tensile strength of high-strength crack-arrest thick plate - Google Patents
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Abstract
本发明提供了一种高强度止裂厚板抗拉强度预测方法，涉及材料断裂失效研究技术领域，所述方法包括：对抗拉强度Rm与合金成分、Ceq、晶粒度、板厚t进行相关性分析；对Rm/t2与Ceq/t2、晶粒度/t2、Si含量/t2、Ni含量/t2分别进行相关性分析；建立高强度止裂厚板抗拉强度预测模型；对高强度止裂厚板的抗拉强度预测时，获得Rm、镍元素含量、硅元素含量、晶粒度、板厚t，并计算Ceq；将Rm、Si含量、Ni含量、晶粒度、t、Ceq代入到模型，确定参数α、β、γ、μ、ρ；本发明所述的一种高强度止裂厚板抗拉强度预测方法，能够较为准确地对高强度止裂厚板抗拉强度进行预测，为钢板止裂韧性评估和更高强度等级止裂厚板开发提供指导。
The present invention provides a method for predicting the tensile strength of a high-strength crack arrest thick plate, which relates to the technical field of material fracture failure research. The method comprises: performing correlation analysis on the tensile strength Rm and alloy composition, Ceq, grain size, and plate thickness t; performing correlation analysis on Rm/ t2 and Ceq/ t2 , grain size/ t2 , Si content/ t2 , and Ni content/ t2 respectively; establishing a tensile strength prediction model for a high-strength crack arrest thick plate; when predicting the tensile strength of the high-strength crack arrest thick plate, obtaining Rm, nickel content, silicon content, grain size, and plate thickness t, and calculating Ceq; substituting Rm, Si content, Ni content, grain size, t, and Ceq into the model to determine parameters α, β, γ, μ, and ρ; the method for predicting the tensile strength of a high-strength crack arrest thick plate described in the present invention can more accurately predict the tensile strength of the high-strength crack arrest thick plate, and provide guidance for the evaluation of crack arrest toughness of steel plates and the development of crack arrest thick plates with higher strength grades.
Description
Technical Field
The invention relates to the technical field of material fracture failure research, in particular to a method for predicting the tensile strength of a high-strength crack-arrest thick plate, and particularly relates to a rapid prediction model for determining the tensile strength of high-strength crack-arrest steel.
Background
In twenty-first century, the development of container ships has been increasingly tending to be large and ultra-large in order to improve benefits and reduce operation cost, and as the structures are large and ultra-large, the strength grade and plate thickness specification of steel plates used for hull structures are continuously increased to meet the requirements of rigidity and strength, the highest strength level has reached 460MPa, and the maximum plate thickness specification is approaching 100mm. As strength increases and plate thickness specifications increase, fracture resistance of the steel plate decreases, and safety and reliability problems thereof are prominent.
In order to ensure the safety of the structure, it is often required that the high-strength thick steel plate for the key part of the large container ship has a crack-stopping performance, namely, once brittle cracks are generated in the structure, the steel plate can stop the brittle cracks, so that the catastrophic damage is avoided. Therefore, the IACS hull committee specially establishes the PT52 working group to establish the relevant standard of the safe application of the marine high-strength steel thick plate with the thickness of 50-100mm, and proposes a crack-stopping performance evaluation test method and technical indexes of crack-stopping performance (the plate thickness is less than or equal to 80mm, kca is more than or equal to 6000N/mm 3/2 at-10 ℃ and the plate thickness is more than 80mm, and Kca is more than or equal to 8000N/mm 3/2 at-10 ℃).
Aiming at the problems of how to evaluate the crack-stopping performance and how to regulate and control the crack-stopping performance, a great deal of researches are carried out at home and abroad, a plurality of correlation models between the crack-stopping toughness/crack-stopping temperature and the characteristic parameters of small-size samples are established, such as a correlation model of crack-stopping toughness, core tensile strength and side surface non-plastic transition temperature, a correlation model of crack-stopping temperature and core dynamic tearing ductile-brittle transition temperature, and the like, the basic mechanical performance parameters influencing the crack-stopping performance are defined by establishing the correlation between a large-size crack-stopping test and a small-size test, and the regulation and improvement of the crack-stopping performance indicates the direction, so that the development of domestic crack-stopping steel is strongly guided.
The results of a large number of researches show that the crack-stopping performance of the crack-stopping thick plate not only depends on the ductile-brittle transition characteristic temperature of the material, but also has close relation with the tensile strength of the material core, and when the ductile-brittle transition temperature is the same, the higher the tensile strength is, the higher the crack-stopping toughness of the material is. In addition, the development of container ships is increasingly large, but the thickness of the plates used on 24000TEU container ships is up to 95mm due to the limit of strength level, and a series of problems such as high production difficulty, weight gain of ship bodies, low welding efficiency of shipyards and the like are brought, so that clear demands are made for improving the strength grade of steel plates and reducing the thickness of the plates.
Therefore, with respect to the tensile strength closely related to the crack-stopping performance of the crack-stopping thick plate, the influence factors influencing the tensile strength of the crack-stopping thick plate are ascertained, so that not only can the support be provided for improving the crack-stopping toughness of the steel plate, but also effective guidance can be provided for developing the crack-stopping steel with higher strength grade. However, no report is published on the factors affecting the tensile strength of the crack-arrest thick plate and the prediction model.
Disclosure of Invention
In view of the above, the invention aims to provide a method for predicting the tensile strength of a high-strength crack-arrest thick plate, which realizes the prediction and evaluation of the tensile strength of the core of the crack-arrest thick plate through the measurement of the alloy components and the grain size of the material, and provides a technical basis for improving the crack-arrest toughness and strength grade of the crack-arrest thick plate so as to fill the blank of researching the influence factors and the prediction model of the tensile strength of the crack-arrest thick plate in the prior art.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
a method for predicting the tensile strength of a high-strength crack-arrest thick plate comprises the following steps:
s1, respectively carrying out correlation analysis on the tensile strength Rm of the high-strength crack-arrest thick plate and the content of single element in alloy components;
s2, introducing a parameter t 2 to correct the relation between the tensile strength Rm and the carbon equivalent Ceq, the grain size, the Si content and the Ni content, and respectively carrying out correlation analysis on Rm/t 2, ceq/t 2, the grain size/t 2, the Si content/t 2 and the Ni content/t 2;
S3, establishing a high-strength crack-arrest thick plate tensile strength prediction model Rm=alpha×Ceq+beta×GS+gamma×Ni+mu×Si+rho×t 2;
S4, when the tensile strength of the high-strength crack-arrest thick plate is predicted, obtaining Rm, nickel element content, silicon element content, grain size and plate thickness t by carrying out tensile test, alloy element analysis and grain size grade assessment on the high-strength crack-arrest thick plate, and calculating according to an alloy element analysis result to obtain carbon equivalent Ceq;
Wherein Rm is the tensile strength of the high-strength crack-arrest thick plate, MPa, ceq is the carbon equivalent,% GS is the grain size, grade, ni is the nickel element content,% Si is the silicon element content,% t is the plate thickness, mm, and alpha, beta, gamma, mu and rho are undetermined parameters.
Further, in step S1, the alloy composition includes at least C, si, mn, ni, cr, mo, cu, al, nb, P.
In step S1, the tensile strength Rm and the alloy composition are data corresponding to the core position of the high-strength crack-arrest thick plate.
Further, ceq has a formula of Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15, wherein C, mn, cr, mo, V, ni, cu is the mass percentage of the corresponding element.
Further, in step S4, parameters α= 1399.3, β=5.4, γ= -48.6, μ=274.5, ρ= -0.011, and a high-strength crack-arresting thick plate tensile strength prediction model rm=1399.3ceq+5.4gs-48.6ni+274.5si-0.011 t 2 is determined by substituting t 50mm to 90mm, ceq 0.359% -0.484%, nickel element content 0.089% -3.35%, silicon element content 0.134% -0.284%, grain size 7-12, and Rm 517mpa to 679mpa into the model expression of step S3, and fitting by using a least square method.
Further, the method is used for predicting the tensile strength of the high-strength crack-arrest thick plate with the tensile strength of 390-460 MPa and the plate thickness of 50-90 mm.
Compared with the prior art, the method for predicting the tensile strength of the high-strength crack-arrest thick plate has the following advantages:
According to the method for predicting the tensile strength of the high-strength anti-cracking thick plate, provided by the invention, the correlation model of the tensile strength, the carbon equivalent, the Si content, the Ni content, the grain size and the plate thickness of the high-strength anti-cracking thick plate is established by introducing the parameter t 2 for correction and analyzing the correlation of the tensile strength, the alloy component and the grain size from the correlation of the tensile strength of the core part of the high-strength anti-cracking thick plate and the alloy component and the grain size, and the prediction model can accurately predict the tensile strength of the high-strength anti-cracking thick plate and has the advantages of definite physical mechanism, simplicity in construction, rapidness in use and the like.
When the core tensile strength of the high-strength crack-arrest thick plate is required to be predicted, the tensile strength, the carbon equivalent, the Si content, the Ni content, the grain size grade and the plate thickness of the core are obtained by carrying out a tensile test, an alloy component test and grain size grade assessment of the crack-arrest thick plate, and the parameters alpha, beta, gamma, mu and rho are determined by substituting the parameters into the model expression in the step S3. And when the subsequent prediction and design of the tensile strength of the core of the high-strength anti-cracking thick plate are performed, the prediction of the tensile strength of the core of the high-strength thick plate can be performed through the alloy component design and the target grain size, and guidance can be provided for evaluation of the anti-cracking toughness of the steel plate and development of the anti-cracking thick plate with higher strength grade.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a diagram showing the correlation between the tensile strength of a core and element C;
FIG. 2 is a diagram showing the correlation between the tensile strength of the core and Si element according to the present invention;
FIG. 3 is a diagram showing the correlation between the tensile strength of the core and Mn element according to the present invention;
FIG. 4 is a diagram showing the correlation between the tensile strength of the core and Ni element according to the present invention;
FIG. 5 is a diagram showing the correlation between the tensile strength of the core and Cr element according to the present invention;
FIG. 6 is a diagram showing the correlation between the tensile strength of the core and Mo element according to the present invention;
FIG. 7 is a diagram showing the correlation between the tensile strength of the core and Cu element according to the present invention;
FIG. 8 is a diagram showing the correlation between the tensile strength of the core and the Al element;
FIG. 9 is a graph showing the correlation of core tensile strength and Nb element in accordance with the present invention;
FIG. 10 is a diagram showing the correlation between the tensile strength of the core and the element P according to the present invention;
FIG. 11 is a graph showing the correlation of core tensile strength and carbon equivalent according to the present invention;
FIG. 12 is a graph showing the correlation between core tensile strength and grain size in accordance with the present invention;
FIG. 13 is a graph showing the correlation between core tensile strength and sheet thickness in accordance with the present invention;
FIG. 14 is a graph showing the correlation between core tensile strength and carbon equivalent after considering the plate thickness effect according to the present invention;
FIG. 15 is a graph showing the correlation between core tensile strength and grain size after considering plate thickness effect in the present invention;
FIG. 16 is a diagram showing the correlation between the tensile strength of the core and Si element after considering the plate thickness effect in the present invention;
FIG. 17 is a graph showing the correlation between the tensile strength of the core and Ni in consideration of the plate thickness effect according to the present invention;
fig. 18 is a graph showing the relationship between the predicted tensile strength and the measured tensile strength in example 1 of the present invention.
Detailed Description
The inventive concepts of the present disclosure will be described below using terms commonly used by those skilled in the art to convey the substance of their work to others skilled in the art. These inventive concepts may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
Aiming at the tensile strength closely related to the crack-stopping performance of the crack-stopping thick plate, the influence factors influencing the tensile strength of the crack-stopping thick plate are ascertained, so that not only can the support be provided for improving the crack-stopping toughness of the steel plate, but also effective guidance can be provided for developing the crack-stopping steel with higher strength level. However, no report is published on the factors affecting the tensile strength of the crack-arrest thick plate and the prediction model.
Based on this, as shown in fig. 1-18, this embodiment provides a method for predicting the tensile strength of a high-strength crack-arrest thick plate, which includes:
s1, respectively carrying out correlation analysis on the tensile strength Rm of the high-strength crack-arrest thick plate and the content of single element in alloy components;
The tensile strength Rm and the alloy composition are data measured at the center of the high-strength crack-arrest thick plate, namely, the tensile strength can be regarded as the center tensile strength, and the alloy composition can also be regarded as the center alloy composition.
In the step S1, the sample of the high-strength crack-stopping thick plate is a 390 MPa-460 MPa-grade crack-stopping thick plate, the plate thickness specification is 50 mm-90 mm, and correspondingly, the method is also suitable for the high-strength crack-stopping thick plate with the specification.
In step S1, the specific correlation analysis result is:
as can be seen from fig. 1 to 10, there is no obvious correlation between the single element and the tensile strength, and it is clearly difficult to achieve effective improvement of the tensile strength by adjusting the single element composition.
As can be seen from fig. 11, as the carbon equivalent increases, the tensile strength of the material increases, but there is some variability in the data correlation, indicating that the carbon equivalent is a factor affecting the tensile strength of the core of the steel sheet.
As can be seen from fig. 12, the tensile strength tends to increase with increasing grain size grade, but the data dispersion is larger, indicating that the grain size (grain size) is also a factor affecting the tensile strength of the steel sheet core.
As can be seen from fig. 13, the strength of the steel sheet tends to decrease somewhat as the sheet thickness increases.
From this, by the correlation analysis of step S1, it can be determined that the carbon equivalent, the grain size, and the plate thickness are all factors affecting the tensile strength of the material.
Similarly, the present application has been briefly described to facilitate the understanding of the technical content of the present application, which was developed by the applicant at the beginning of its study.
The alloy components and microstructure of the material are often core influencing factors influencing the strength of the material, and the main alloy elements include C, si, mn, cr, mo, V, ni, cu, ti, nb, impurity elements P, S and the like. Wherein, C is an essential element for ensuring the strength, si is a main deoxidizing component in the steelmaking process and mainly enhances the strength of the material through solid solution strengthening and precipitation strengthening, si existing in a solid solution form can enhance the ductile-brittle transition temperature while enhancing the strength, mn is an essential element for ensuring the strength and toughness of the steel plate, mn and S are combined to form MnS, hot cracks caused by FeS formation at a grain boundary are avoided, and Mn is also a good deoxidizer. Cu can improve the strength of the material, ni has a solid solution strengthening effect, can promote the steel plate to form a stable austenite structure, improves the strength and toughness of the steel plate, al is a deoxidizing and refining grain element, nb can effectively refine the grain size of the steel, is an element added for improving the strength and toughness of the steel, ti can improve the toughness of the steel and the toughness of a welding heat affected zone, mainly exists in a TiN form to play a role, P is an element which is unfavorable for the toughness of the material, can segregate at the central part of a plate blank, can be aggregated at a grain boundary and the like to damage the low-temperature toughness, S is also an element which is unfavorable for the toughness of the material, can form sulfide inclusions and become a crack source. At the same time, the size of the crystal grains has obvious influence on the strength of the material, and the smaller the size of the crystal grains is, the higher the strength of the material is. Based on the method, a foundation is laid for the research direction of the application, and the applicant gradually researches and builds a prediction model of the core tensile strength through the analysis of the correlation between the core tensile strength of the high-strength crack-arrest thick plate and the alloy components and the grain size.
S2, introducing a parameter t 2 to correct the relation between the tensile strength Rm and the carbon equivalent Ceq, the grain size, the Si content and the Ni content, and respectively carrying out correlation analysis on Rm/t 2, ceq/t 2, the grain size/t 2, the Si content/t 2 and the Ni content/t 2;
In order to avoid misunderstanding, the parameter t 2 is the square of the plate thickness t, and is aimed at introducing this influencing factor based on the influence of the plate thickness on the tensile strength and correcting other relevant parameters.
In step S2, the specific correlation analysis result is:
As can be seen from FIG. 14, there is a clear linear relationship between Rm/t 2 and Ceq/t 2;
As can be seen from fig. 15, there is also a clear linear relationship between Rm/t 2 and grain size/t 2;
It can be seen from FIGS. 16 and 17 that Rm/t 2 has a certain linear correlation with Si content/t 2 and Ni content/t 2.
The carbon equivalent Ceq contains 7 elements such as alloy element C, mn, cr, mo, V, ni, cu, but does not contain Si element which affects the strength of the material, meanwhile, ni is used as an alloy element which can not only enhance the strength of the material but also improve the toughness of the material, and is a core element which affects the toughness of the material.
S3, establishing a high-strength crack-arrest thick plate tensile strength prediction model Rm=alpha×Ceq+beta×GS+gamma×Ni+mu×Si+rho×t 2;
Wherein Rm is the tensile strength of the high-strength crack-arrest thick plate, MPa, ceq is the carbon equivalent,%, and the calculated formula of Ceq is Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15, GS is the grain size, grade, ni is the nickel element content,%; si is the silicon element content,%; t is the plate thickness, mm, and alpha, beta, gamma, mu and rho are undetermined parameters.
Based on the correlation analysis results of the steps S1 and S2, after the parameter t 2 is introduced for correction, the tensile strength has close relations with the carbon equivalent, the grain size, the Si element content and the Ni element content, namely the tensile strength of the crack-arrest thick plate mainly depends on the carbon equivalent, the grain size, the Si element content, the Ni element content and the plate thickness.
S4, when the tensile strength of the high-strength crack-arrest thick plate is predicted, obtaining Rm, nickel element content, silicon element content, grain size and plate thickness t by carrying out tensile test, alloy element analysis and grain size grade assessment on the high-strength crack-arrest thick plate, calculating according to an alloy element analysis result to obtain carbon equivalent Ceq, substituting Rm, nickel element content, silicon element content, grain size, t and Ceq into a model expression of the step S3, and determining parameters alpha, beta, gamma, mu and rho.
The method comprises the steps of carrying out a tensile test on a high-strength crack-arrest thick plate according to GB/T228.1 'a room temperature test method of a metal material tensile test part 1', carrying out alloy element analysis on the high-strength crack-arrest thick plate according to ASTM E1019, GB/T20125, GB/T22382, SN/T3806 and other standards, carrying out grain size grade assessment on the high-strength crack-arrest thick plate according to GB/T6394, determining the grain size grade, and calculating Ceq according to a calculated formula of the Ceq in the step S3. Meanwhile, not only in step S4, the related data are obtained in the present application, and detailed description is omitted.
After the parameters alpha, beta, gamma, mu and rho are determined, the model expression is a definite mathematical relation, the tensile strength of the high-strength crack-arrest thick plate is predicted in the subsequent process, and the tensile strength of the high-strength crack-arrest thick plate can be predicted only by substituting the carbon equivalent, si content, ni content, grain size grade and plate thickness into the definite mathematical relation (namely the final prediction model) without carrying out tensile test again and carrying out alloy element analysis and grain size grade assessment on the high-strength crack-arrest thick plate.
According to the invention, from the correlation of the tensile strength of the core of the high-strength crack-arrest thick plate and the alloy component and the grain size, after the parameter t 2 is introduced for correction, a correlation model of the tensile strength, the carbon equivalent, the Si content, the Ni content, the grain size and the plate thickness of the high-strength crack-arrest thick plate is established through the correlation analysis of the tensile strength, the alloy component and the grain size, and the prediction model can accurately predict the tensile strength of the high-strength crack-arrest thick plate and has the advantages of definite physical mechanism, simplicity in construction, rapidness in use and the like.
When the core tensile strength of the high-strength crack-arrest thick plate is required to be predicted, the tensile strength, the carbon equivalent, the Si content, the Ni content, the grain size grade and the plate thickness of the core are obtained by carrying out a tensile test, an alloy component test and grain size grade assessment of the crack-arrest thick plate, and the parameters alpha, beta, gamma, mu and rho are determined by substituting the parameters into the model expression in the step S3. And when the subsequent prediction and design of the tensile strength of the core of the high-strength anti-cracking thick plate are performed, the prediction of the tensile strength of the core of the high-strength thick plate can be performed through the alloy component design and the target grain size, and guidance can be provided for evaluation of the anti-cracking toughness of the steel plate and development of the anti-cracking thick plate with higher strength grade.
Example 1
In view of the foregoing detailed description of the specific analysis process of the steps S1-S3, and the same content is adopted in this embodiment, for this reason, the detailed implementation process of the steps S1-S3 is not repeated in terms of text.
The present embodiment is focused on the implementation of step S4.
Step a, carrying out tensile test on high-strength crack-arrest thick plates of different batches according to GB/T228.1 'a room temperature test method of a part 1 of a tensile test of a metal material', obtaining core tensile strength, carrying out alloy element analysis on the core of a steel plate according to ASTM E1019, GB/T20125, GB/T22382, SN/T3806 and other standards, calculating to obtain carbon equivalent Ceq, and simultaneously carrying out grain size evaluation on the core position of the steel plate according to GB/T6394, and determining grain size grade, wherein the data are shown in Table 1. In the actual implementation of step a, the detected data sets are numerous, and are difficult to display one by one, and only the range of the acquired data is shown in table 1.
Table 1 detection data for high strength crack arrest planks
Substituting the data measured in the step a into the model expression of the step S3, and fitting by using a least square method to obtain undetermined parameters of alpha= 1399.3, beta=5.4, gamma= -48.6, mu=274.5 and rho= -0.011, and correspondingly obtaining a high-strength crack-arresting thick plate tensile strength prediction model Rm=1399.3Ceq+5.4GS-48.6Ni+274.5Si-0.011 t 2 (formula A);
Substituting the individual data sets in the step a into the formula A, respectively calculating to obtain Rm predicted values, and comparing the Rm predicted values with corresponding Rm actual measured values, wherein the comparison results of the partial data sets are shown in the table 2.
TABLE 2 comparison of Rm predictions and Rm measured values for high Strength crack arrest planks
The relative deviation is the difference between the Rm actual measurement value and the Rm predicted value, and divided by the Rm actual measurement value.
As can be seen from the results in Table 2, the absolute value of the relative deviation between the Rm predicted value and the Rm measured value obtained by the high-strength anti-cracking thick plate tensile strength prediction method is not more than 6.5%.
Meanwhile, reference may be made to fig. 18 for specific comparison, in which fig. 18 uses the Rm predicted value as the abscissa and the Rm measured value as the ordinate, and a point may be determined in the coordinate system by using a set of corresponding Rm predicted values and Rm measured values. As can be seen from fig. 18, the relative deviation between the Rm predicted value and the Rm measured value obtained by the method for predicting the tensile strength of the high-strength crack-arrest thick plate is smaller, and the deviation range requirement of the design research requirement (the deviation range requirement corresponds to the range between the uppermost oblique line and the lowermost oblique line in fig. 18) can be met.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
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| CN108763637A (en) * | 2018-04-19 | 2018-11-06 | 张家港联峰钢铁研究所有限公司 | A kind of calculating of hot rolling wire tensile strength and pre-judging method |
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| CN114781113B (en) * | 2022-03-04 | 2023-03-24 | 中国船舶重工集团公司第七二五研究所 | Prediction model for crack arrest temperature of high-strength steel thick plate for ship and construction method and application thereof |
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| CN108763637A (en) * | 2018-04-19 | 2018-11-06 | 张家港联峰钢铁研究所有限公司 | A kind of calculating of hot rolling wire tensile strength and pre-judging method |
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