CN101509056A - Thermal treatment method for precipitation hardening of martensitic stainless steel FV520B - Google Patents
Thermal treatment method for precipitation hardening of martensitic stainless steel FV520B Download PDFInfo
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- CN101509056A CN101509056A CNA2008100109437A CN200810010943A CN101509056A CN 101509056 A CN101509056 A CN 101509056A CN A2008100109437 A CNA2008100109437 A CN A2008100109437A CN 200810010943 A CN200810010943 A CN 200810010943A CN 101509056 A CN101509056 A CN 101509056A
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- 229910001105 martensitic stainless steel Inorganic materials 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000004881 precipitation hardening Methods 0.000 title claims description 32
- 238000007669 thermal treatment Methods 0.000 title description 5
- 238000005496 tempering Methods 0.000 claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims description 26
- 239000010959 steel Substances 0.000 claims description 26
- 229910001566 austenite Inorganic materials 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 11
- 229910000734 martensite Inorganic materials 0.000 claims description 10
- 238000009738 saturating Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 7
- 238000001816 cooling Methods 0.000 abstract description 6
- 238000005728 strengthening Methods 0.000 description 17
- 229910045601 alloy Inorganic materials 0.000 description 8
- 239000000956 alloy Substances 0.000 description 8
- 238000009413 insulation Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000004643 material aging Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention provides a method for heat-treating precipitation-hardened martensitic stainless steel FV520B, particularly a method adopting the following manner: tempering the precipitation-hardened martensitic stainless steel FV520B at a higher temperature for a short time and then slowly cooling, to lead the precipitation-hardened martensitic stainless steel FV520B to have the advantage of good combination of toughness and strength, and solve the following problems of the existing heat treatment processes: the high-temperature tempering strength is low and the low-temperature tempering toughness is low; as a result, the high strength and the high toughness cannot be achieved at the same time.
Description
Technical field
The present invention relates to a kind of heat treating method of precipitation hardening of martensitic stainless steel FV 520 B, specifically precipitation hardening of martensitic is carried out the short period of time tempering at comparatively high temps, take slow refrigerative mode afterwards, make this precipitation hardening of martensitic stainless steel have good toughness and intensity combination.
Background technology
The low-carbon (LC) precipitation hardening of martensitic stainless steel, to be easy to processing, intensity height, toughness good because of it, have excellent corrosion resistant performance and welding property, also have the lateral performance of good impact toughness and larger cross-section coideal, be widely used in occasions such as gear, bolt, axle, wheel disc, blade, rotor, pump.Successfully produce the various parts of such Martensite Stainless Steel of excellent property in the world, but owing to reasons such as technical know-hows, the details of thermal treatment gordian technique is unknown, the parameter of bibliographical information does not often have reference value yet owing to scope is wide.China adopts such steel in a large number at some key parts in fields such as space flight and compressor.
Precipitation hardening of martensitic Heat Treatment Of Steel technology plays decisive role to its tissue and performance.Usually, its high strength is mainly separated out 8-Cu, NbC, Mo by strengthening elements such as Cu, Nb, Mo in ag(e)ing process
2C, M
7C
3, M
23C
6Obtain Deng strengthening phase.The heat treating regime that present such steel is adopted adds the tempered processing method for quenching, and the tempering system mainly contains two kinds, and the one, at 400-470 ℃ of (A
C1Below) carry out low-temperaturetempering, obtain the tiny strengthening phase tissue of martensite+disperse, obtain higher intensity; The one, at 580-650 ℃ of (A
C1More than) carry out the comparatively high temps tempering, at this moment since tempering temperature at A
C1More than (about 580 ℃), can obtain a small amount of reversed austenite in the room temperature undertissue, the existence of reversed austenite increases substantially the toughness of steel, but under the high temperature, the precipitated phase size is grown up, and reduces the intensity of alloy.Therefore, generally speaking, each user can only select wherein a kind of tempering system according to demand, obtains high strength or high tenacity and sacrifices another performance.According to bibliographical information, there is not a kind of heat treating regime can make this steel obtain high strength and high tenacity simultaneously at present.
Summary of the invention
The heat treating method that the purpose of this invention is to provide a kind of precipitation hardening of martensitic stainless steel FV 520 B, make this steel have good toughness and intensity combination, it is low to solve the existing thermal treatment process high tempering of this steel intensity, and low-temperaturetempering toughness is low, the problem that high strength and high tenacity can not get both.
The invention provides a kind of heat treating method of precipitation hardening of martensitic stainless steel FV 520 B, precipitation hardening of martensitic stainless steel FV 520 B is carried out normalizing and comparatively high temps short period of time temper after, take slow refrigerative mode.
The heat treating method of precipitation hardening of martensitic stainless steel FV 520 B provided by the invention may further comprise the steps:
(1) steel is carried out normalizing treatment, treatment process is: pending precipitation hardening of martensitic stainless steel FV 520 B material is put into return stove, be heated above A
C3(A
C3Be about 800～830 ℃) make complete austenitizing more than 200 ℃, promptly 1050 ± 10 ℃ are carried out normalizing, are incubated 1-2 hour (soaking time should according to material thickness), shrend then;
(2) steel is carried out temper, treatment process is: the precipitation hardening of martensitic stainless steel material that (1) is finished dealing with is put into and is return stove, is heated above A
C1(A
C1Be about 570～600 ℃) form the mixed structure that tempered martensite adds reversed austenite, promptly 630 ± 10 ℃ are carried out tempering, burn back insulation 5-60 minute (time of burning should according to material thickness) thoroughly thoroughly, cool to room temperature then with the furnace.
The heat treating method of precipitation hardening of martensitic stainless steel FV 520 B provided by the invention, described high tempering temperature is A
C1More than 20～50 ℃.
The time that the heat treating method of precipitation hardening of martensitic stainless steel FV 520 B provided by the invention, described tempering burn the back isothermal treatment for short time thoroughly is preferably 10-15 minute.
The present invention selects higher temperatures tempering in short-term, and promptly tempering temperature is selected A
C1Above 20-50 ℃, because the reversed austenite of this steel is to form with the shear form, so formation speed is very fast; And separating out and growing up of its strengthening phase needs the time to spread.Such high temperature, short time is handled, and both can obtain the reversed austenite tissue, can not cause separating out in a large number of strengthening phase again in tempering simultaneously.Strengthening phase is mainly separated out in annealing process, because temperature is lower, can not take place to grow up unusually, has guaranteed strengthening effect.
With prior art relatively, the present invention has following characteristics:
(1) FV520B of the present invention selects high tempering, and promptly tempering temperature is selected 630 ± 10 ℃, not only has the reversed austenite tissue to generate, and also has separating out of strengthening phase simultaneously; And the document tempering temperature that provides the FV520B steel was selected about 400 ℃ in the past, only helped separating out of strengthening phase.
(2) timeliness is in short-term selected in tempering of the present invention, the promptly saturating back insulation 10-15 branch that burns; And in the past document to provide FV520B steel timeliness be long-time timeliness, the time is 1-2 hour.
(3) the present invention selects with the cold type of cooling of stove.And in the past document to provide the FV520B steel be the air cooling mode.
The present invention has following outstanding advantage:
(1) precipitation hardening of martensitic stainless steel FV 520 B Heat Treatment Of Steel method of the present invention produces a certain amount of reversed austenite tissue generation and a certain amount of strengthening phase and separates out, and makes hardness of steel and toughness obtain raising simultaneously.
(2) because the material aging time is shorter, having avoided growing up because of the strengthening phase of separating out produces the strength of materials and descends, and the reversed austenite tissue content is stablized in ag(e)ing process.
(3) precipitation hardening of martensitic stainless steel FV 520 B Heat Treatment Of Steel method of the present invention makes the thermal treatment of FV520B steel energy-conservation and save time.
(4) the present invention is the practical application of precipitation hardening of martensitic stainless steel, and the theoretical basis of heat treatment technics is provided.
Embodiment
Embodiment 1
Choose the steel of a FV520B precipitation hardening of martensitic steel, the main component of this steel sees Table 1.The former primary state of steel is that thickness is the forging sheet material of (11) mm, and through the thermal dilatometer test, the phase change characteristics temperature of this steel is: A
C1, A
C3, Ms sees Table 2.According to this, Steel Alloy is carried out the temper of the differing temps and the type of cooling respectively, relatively its tensile property and impact property.
The main component of table 1 FV520B precipitation hardening of martensitic steel
| Element | C | Si | Mn | S | P | Ni | Cr | Cu | Mo | Nb |
| Content | 0.042 | 0.335 | 0.579 | 0.0016 | 0.017 | 5.540 | 13.80 | 1.560 | 1.470 | 0.391 |
The phase change characteristics temperature of table 2 FV520B precipitation hardening of martensitic steel
| Stagnation point | A c1 | A c3 | Ms |
| Temperature ℃ | 589 | 847 | 180 |
Process of thermal treatment is as follows:
(1) pending FV520B precipitation hardening of martensitic stainless steel material sample is put into return stove, be heated above A
C3To complete austenitizing, promptly 1050 ± 10 ℃ are carried out normalizing more than 200 ℃, are incubated 1-2 hour, shrend then.
(2) the FV520B precipitation hardening of martensitic stainless steel material sample after the normalizing shrend is put into heat treatment furnace, be heated above A
C1Above 20-50 ℃ forms the mixed structure that tempered martensite adds reversed austenite, and promptly 630 ± 10 ℃ are carried out tempering, and then, a kind of burning back insulation 5,15,60 minutes cools to room temperature with the furnace; A kind of burning back insulation 15 minutes, cool to the furnace 450 ℃ be incubated 1 hour again after, air cooling is to room temperature; A kind of burning back insulation 15 minutes, cool to room temperature with the furnace after, reheat to 450 ℃ insulation after 1 hour air cooling to room temperature.Toughness and intensity experiment the results are shown in Table 3 and table 4.
Table 3 toughness experimental result
| A k-v(J) | a k-v(J/cm 2) | |
| 450 ℃ of 2h impact (room temperature) | 19 | 32 |
| 630 ℃ of impacts (room temperature) in 5 minutes | 57 | 95 |
| 630 ℃ of impacts (room temperature) in 15 minutes | 62 | 102 |
| 630 ℃ of impacts (room temperature) in 60 minutes | 99 | 123.5 |
| 630 ℃ of 15 minutes to 450 ℃ 1h impact (room temperature) | 65 | 115 |
| 630 ℃ of 15 minutes (room temperature)+450 ℃ 1h impact (room temperature) | 64 | 113 |
Table 4 intensity experiment result
| σ 0.2N | σ bN | δ％ | Ψ％ | |
| 450℃ | 1173 | 1273.6 | 16.8 | 63 |
| 630 ℃ 5 minutes | 1087 | 1112.5 | 19.6 | 63 |
| 630 ℃ 15 minutes | 1141 | 1162.2 | 25.6 | 65 |
| 630 ℃ 60 minutes | 779 | 989.85 | 20.2 | 67.3 |
| 630 ℃ were chilled to 450 ℃ of 1h in 15 minutes | 1016.6 | 1065.5 | 19.6 | 53 |
| 630 ℃ of 15 minutes (room temperature)+450 ℃ 1h | 1016 | 1067 | 19 | 53 |
Interpretation of result:
The data of contrast table 3 and table 4 are passed through A as can be seen
C1Below the sample of 450 ℃ of temper, its intensity is higher, yield strength is about 1173MPa, tensile strength is about 1274MPa; And toughness is lower, under the v-notch, and impelling strength 32J/cm
2, ballistic work 19J.Through 1 hour sample of 630 ℃ of temper, its intensity is lower, and yield strength is about 779MPa, and tensile strength is about 989MPa; And toughness is higher, under the v-notch, and impelling strength 123.5J/cm
2, ballistic work 99J.
This mainly is that the tissue that produces under the different heat treatment system with alloy is relevant: the sample of 450 ℃ of temper, especially treatment temp is at A
C1Below, through X ray and scanning electron microscope analysis, do not contain reversed austenite in the sample after the tempering, and contain the rich Cu strengthening phase of a large amount of small and disperseds in the alloy, cause its high strength, low toughness; And containing 22% the reversed austenite of having an appointment in the sample of 1 hour temper of 630 ℃ of insulations, reversed austenite absorbs energy in impact process, hinder crack propagation, improve alloy toughness, but the strengthening phase in the alloy has taken place to grow up, and bigger size reaches um, has reduced strengthening effect.
With this two kinds of processing systems contrast, contain reversed austenite through the sample of 630 ℃ and 450 ℃ processing, raising alloy toughness, under the v-notch, impelling strength 113J/cm
2, ballistic work 64J; But the strengthening phase in the alloy has taken place to grow up, and bigger size reaches um, has reduced strengthening effect, and intensity has reduced, and yield strength is about 1016MPa, and tensile strength is about 1067MPa.
Have only through the tempering system and be: 630 ℃ are incubated 15 minutes, and the FV520B precipitation hardening of martensitic stainless steel material sample after the processing just obtains high-strong toughness.Its intensity is higher, and yield strength is about 1141MPa, and tensile strength is about 1162MPa; Toughness is also higher, under the v-notch, and impelling strength 102J/cm
2, ballistic work 62J.Through X ray and scanning electron microscope analysis, contain 5% the reversed austenite of having an appointment in the sample in the sample after the tempering, and also contain the rich Cu strengthening phase of a certain amount of small and dispersed in the alloy, cause its high strength, high tenacity.
Claims (5)
1. the heat treating method of a precipitation hardening of martensitic stainless steel FV 520 B is characterized in that: after precipitation hardening of martensitic stainless steel FV 520 B is carried out normalizing and comparatively high temps short period of time temper, take slow refrigerative mode.
2. according to the heat treating method of the described precipitation hardening of martensitic stainless steel FV 520 B of claim 1, it is characterized in that, may further comprise the steps:
(1) steel is carried out normalizing treatment, treatment process is: pending precipitation hardening of martensitic stainless steel FV 520 B material is put into return stove, be heated above A
C3Make complete austenitizing more than 200 ℃, promptly 1050 ± 10 ℃ are carried out normalizing, are incubated 1-2 hour, shrend then;
(2) steel is carried out temper, treatment process is: the precipitation hardening of martensitic stainless steel material that (1) is finished dealing with is put into and is return stove, is heated above A
C1Form the mixed structure that tempered martensite adds reversed austenite, the saturating back of burning is incubated 5-60 minute, cools to room temperature then with the furnace.
3. according to the heat treating method of the described precipitation hardening of martensitic stainless steel FV 520 B of claim 2, it is characterized in that: described high tempering, temperature are A
C1More than 20～50 ℃.
4. according to the heat treating method of the described precipitation hardening of martensitic stainless steel FV 520 B of claim 2, it is characterized in that: described tempering was burnt the back isothermal treatment for short time 10-15 minute thoroughly.
5. according to the heat treating method of the described precipitation hardening of martensitic stainless steel FV 520 B of claim 3, it is characterized in that: described tempering temperature is 630 ± 10 ℃.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102560022A (en) * | 2012-03-05 | 2012-07-11 | 昆明理工大学 | Method for controlling content of reversed austenite in super martensitic stainless steel |
| CN104271787A (en) * | 2012-09-27 | 2015-01-07 | 日立金属株式会社 | Precipitation hardening type martensitic steel and process for producing same |
| CN104451072A (en) * | 2014-11-14 | 2015-03-25 | 无锡阳工机械制造有限公司 | Heat treatment method of 14Cr17Ni2 stainless steel |
| CN104588591A (en) * | 2015-01-16 | 2015-05-06 | 遵义拓特铸锻有限公司 | Martensitic stainless steel pump case product for manufacturing spray pump of containment for nuclear power plant |
| CN104831034A (en) * | 2015-04-30 | 2015-08-12 | 智腾机械设备（上海）有限公司 | Heat treatment method for enclosed impeller |
| CN105039869A (en) * | 2015-08-11 | 2015-11-11 | 中国人民解放军装甲兵工程学院 | Alloy powder used for laser remanufacturing of martensitic stainless steel parts and preparation method |
| US20170121808A1 (en) * | 2015-11-04 | 2017-05-04 | Haidou WANG | Method for enhancing anti-fatigue performance of coating |
| CN106639934A (en) * | 2016-09-22 | 2017-05-10 | 石家庄博深石油机械有限公司 | Valve spool and valve seat of bypass valve body of screw rod drilling tool |
| CN108251759A (en) * | 2018-02-01 | 2018-07-06 | 南京理工大学 | The martensitic stain less steel and its manufacturing method of reversed austenite toughening |
| CN108393557A (en) * | 2018-05-22 | 2018-08-14 | 大连透平机械技术发展有限公司 | The welding method of blower wheel FV520B/KMN dissimilar materials |
| CN109487061A (en) * | 2019-01-10 | 2019-03-19 | 成都先进金属材料产业技术研究院有限公司 | The heat treatment method of martensitic precipitation 06Cr15Ni5Cu2Ti |
| CN110205446A (en) * | 2019-06-17 | 2019-09-06 | 西安理工大学 | A kind of G520 martensitic precipitation heat treatment method |
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2008
- 2008-04-08 CN CN2008100109437A patent/CN101509056B/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102560022A (en) * | 2012-03-05 | 2012-07-11 | 昆明理工大学 | Method for controlling content of reversed austenite in super martensitic stainless steel |
| CN104271787A (en) * | 2012-09-27 | 2015-01-07 | 日立金属株式会社 | Precipitation hardening type martensitic steel and process for producing same |
| CN104451072A (en) * | 2014-11-14 | 2015-03-25 | 无锡阳工机械制造有限公司 | Heat treatment method of 14Cr17Ni2 stainless steel |
| CN104588591B (en) * | 2015-01-16 | 2016-11-23 | 遵义拓特铸锻有限公司 | Manufacture a kind of containment spray pump for nuclear power station martensitic stain less steel pump case product |
| CN104588591A (en) * | 2015-01-16 | 2015-05-06 | 遵义拓特铸锻有限公司 | Martensitic stainless steel pump case product for manufacturing spray pump of containment for nuclear power plant |
| CN104831034A (en) * | 2015-04-30 | 2015-08-12 | 智腾机械设备（上海）有限公司 | Heat treatment method for enclosed impeller |
| CN105039869A (en) * | 2015-08-11 | 2015-11-11 | 中国人民解放军装甲兵工程学院 | Alloy powder used for laser remanufacturing of martensitic stainless steel parts and preparation method |
| US20170121808A1 (en) * | 2015-11-04 | 2017-05-04 | Haidou WANG | Method for enhancing anti-fatigue performance of coating |
| CN106639934A (en) * | 2016-09-22 | 2017-05-10 | 石家庄博深石油机械有限公司 | Valve spool and valve seat of bypass valve body of screw rod drilling tool |
| CN108251759A (en) * | 2018-02-01 | 2018-07-06 | 南京理工大学 | The martensitic stain less steel and its manufacturing method of reversed austenite toughening |
| CN108251759B (en) * | 2018-02-01 | 2019-09-27 | 南京理工大学 | Inverted austenitic toughened martensitic stainless steel and method of manufacturing the same |
| CN108393557A (en) * | 2018-05-22 | 2018-08-14 | 大连透平机械技术发展有限公司 | The welding method of blower wheel FV520B/KMN dissimilar materials |
| CN109487061A (en) * | 2019-01-10 | 2019-03-19 | 成都先进金属材料产业技术研究院有限公司 | The heat treatment method of martensitic precipitation 06Cr15Ni5Cu2Ti |
| CN109487061B (en) * | 2019-01-10 | 2020-07-07 | 成都先进金属材料产业技术研究院有限公司 | Heat treatment method of martensite precipitation hardening stainless steel 06Cr15Ni5Cu2Ti |
| CN110205446A (en) * | 2019-06-17 | 2019-09-06 | 西安理工大学 | A kind of G520 martensitic precipitation heat treatment method |
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