JPH07331408A - High damping alloy steel member having wear resistance and its production - Google Patents

Abstract

PURPOSE:To produce a high damping alloy steel member excellent in wear resistance by film-forming an Ni-base or Co-base self-fluxing alloy on the surface of a high damping alloy steel member by thermal spraying. CONSTITUTION:The surface of a high damping alloy steel member is thermally sprayed with an Ni-base or Co-base self-fluxing alloy to execute film forming. The Ni-base self fluxing alloy is essentially contg. O to 20% Cr, 1.0 to 4.5% B, l.5 to 5.0% Si, <=1.1% C, <=5% Fe, <=1% Co, <=4% Mo, <=4% Cu, and the balance Ni. Moreover, the Co-base self-fluxing alloy is essentially contg., by weight, 0 to 30% Ni, 16 to 24% Cr, 1.5 to 2.4% B, 1.5 to 4.5% Si, <=1.5% C, <=5% Fe, <=7% Mo, 4 to 15% W, and the balance Co. After the film forming by thermal spraying, fusing treatment is executed at about 950 to 1250 deg.C, by which the high damping allay steel member improved in wear resistance while its high damping capacity is maintained can be obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a vibration-damping alloy steel member, for example, an alloy-type vibration-damping steel, which is spray-coated with a wear-resistant alloy to form a wear-resistant alloy with excellent wear resistance. And a damping alloy steel member and a method for manufacturing the same.

[0002]

2. Description of the Related Art Recent industrial economic development, on the other hand, has caused various pollutions such as air pollution, water pollution, soil pollution, noise, vibration, ground subsidence, and bad odor, which significantly deteriorates the living environment. Is causing In particular, noise is often complained by the general public, and general traffic noise such as aircraft and noise generated from various machines and structures are often serious social problems and work environment problems at work.

As measures against this, along with basic research on noise phenomena, vigorous efforts are being made to reduce and reduce noise sources that have direct effects, while the development and practical application of various soundproofing and vibration-proofing materials are being promoted. Came. A typical example thereof is a resin composite type vibration damping steel plate in which a synthetic resin is laminated between steel plates, which are disclosed in JP-A-1-125220 and JP-A-1-12.
The technique is proposed in Japanese Patent No. 7332, Japanese Patent Laid-Open No. 2-251433, Japanese Patent Laid-Open No. 4-77245, Japanese Patent Laid-Open No. 5-69509, Japanese Utility Model Laid-Open No. 62-68434, and the like.

Further, a metal material having a large vibration damping ability, particularly a steel member which plays a major role in a structure, is disclosed in Japanese Patent Laid-Open No. 3-1837
According to JP-A-41, JP-A-4-99148, JP-A-4-99149, and JP-A-4-232229, various alloys excellent in vibration damping performance including improvement of chemical composition and heat treatment conditions are disclosed. Steel members belonging to the type damping steel have been developed.

Further, a technique aimed at improving the appearance and corrosion resistance as well as damping effect by applying surface treatments such as various electroplating coatings and chemical treatment coatings on steel materials is disclosed in Japanese Patent Laid-Open No. 2-29326, It is proposed by Japanese Patent Laid-Open Nos. 3-184839 and 3-193443.

However, conventional damping alloy steels are (1) expensive, (2) difficult to form, (3) difficult to weld, and (4) damping performance at high and low temperatures. Is low,
(5) A material having a larger damping capacity is softer and has poor wear resistance. (6) Alloy-type damping steel has drawbacks such as deterioration in performance when subjected to processing accompanied by plastic deformation. Therefore, its field of use is limited, and its status as a general-purpose material is still insufficient.

In response to such a situation, one of the inventors of the present invention utilizes the porosity of the thermal spray coating to plate various metals therein, or to mutually deposit a large number of metals and ceramics having different natural frequencies. To improve the soundproofing and antivibration effects by forming a laminated thermal spray coating, it is disclosed in
Proposed in Japanese Patent No. 236264. This thermal spraying member has little resonance, and exhibits some performance in an environment where a light impact force is applied, but under the condition that a large heavy object contacts or collides, the thermal sprayed film Since there is a risk of peeling, there was a need for further improvement.

[0008]

As described above, a steel member having excellent vibration damping performance generally has low rigidity and is soft and therefore has a drawback of poor wear resistance. Further, it is known that the synthetic resin composite type damping steel plate loses its function under high temperature. On the other hand, vibration-damping alloy steel, for example, alloy-type vibration-damping steel, has a drawback that its vibration-damping performance is deteriorated by slight plastic working such as grit blasting and bending cutting.

Further, even if a hard Cr plating film is applied to vibration-damping steel that is soft and poor in wear resistance, the hardness of the Cr plating film will decrease in an environment of 350 ° C. or higher, so that the wear resistance will be improved. I can't expect. In addition, just by forming a thermal spray coating on the alloy-type vibration-damping steel, the vibration-damping performance may deteriorate due to the blasting treatment performed as a pretreatment.
I need some measure.

[0010]

[Means for Solving the Problems] In order to make up for the drawbacks of the current damping alloy steel materials, the member of the present invention is formed by spraying a Ni-based or Co-based alloy on the surface of the steel material and then applying the
Fusing treatment at 0-1250 ℃ or 950
It is heated at a temperature of ~ 1250 ° C for a predetermined time to make the thermal spray coating dense and highly hardened, and to diffuse and permeate into the substrate. The film thus formed is hard and has excellent wear resistance, and because it is metallurgically bonded to the base material, it exhibits good adhesion and does not peel even when subjected to a large impact. Further, for alloy-type vibration-damping steel whose vibration-damping performance has deteriorated due to plastic working, this treatment has the effect of recovering the vibration-damping performance of the substrate.

(1) The invention of claim 1 is a vibration-damping alloy steel member having wear resistance in which a Ni-based or Co-based self-fluxing alloy is spray-coated on the surface of the vibration-damping alloy steel member.

(2) The invention of claim 2 is the vibration-damping alloy steel member having wear resistance according to claim 1, wherein the Ni-based self-fluxing alloy has the following composition (the composition is wt%): . As main components, Cr: 0 to 20%, B: 1.0 to 4.5%, Si: 1.5 to 5.0%, C: 1.1% or less, Fe: 5% or less, Co: 1% or less, Mo: 4% or less, Cu : 4% or less, Ni: balance.

(3) The invention of claim 3 is the vibration-damping alloy steel member having wear resistance according to claim 3, wherein the Co-based self-fluxing alloy has the following component composition (component composition is wt%). . As the main component, Ni: 0-30%, Cr: 16-24%, B: 1.5-2.4%, Si: 1.5-4.5%, C: 1.5% or less, Fe: 5% or less, Mo: 7% or less, W: 4 to 15% or less, Co: The balance.

(4) The invention of claim 4 is characterized in that the Ni-based alloy or the Co-based alloy is WC, Cr ₃ C ₂ or N, respectively.
The vibration-damping alloy steel member having wear resistance according to claim 2 or 3, which contains 20 to 80% by volume of carbide particles of any one or more of bC, TiC, and TaC.

(5) According to a fifth aspect of the invention, after a Ni-based or Co-based self-fluxing alloy is formed by thermal spraying on the surface of the vibration-damping alloy steel member, it is subjected to a fusing treatment to make the film dense and the steel base. A method for producing a vibration-damping alloy steel member having wear resistance, characterized by performing metallurgical bonding with a material and recovering or maintaining the vibration-damping performance by utilizing heat of fusing treatment.

(6) In the invention of claim 6, after the Ni-based or Co-based self-fluxing alloy is formed by thermal spraying, the damping alloy steel member formed by thermal spraying is further heated at 950 to 1250 ° C. for 15 minutes or more, The method of manufacturing a vibration-damping alloy steel member having wear resistance according to claim 5, wherein the film is hardened and the adhesion is improved, and the vibration-damping performance possessed by the vibration-damping steel is restored or maintained. is there.

[0017]

In the damping alloy steel member having the sprayed coating of the present invention, it is important to select the damping alloy steel as the base material, the spraying material and the construction technique thereof. The base material to be sprayed is preferably a vibration-damping alloy steel member having a vibration-damping performance superior to that of ordinary carbon steel.
In particular, when alloy-type damping steel or damping alloy in which 2.5% Al-0.5% Si-remainder is substantially represented by Fe is sprayed, the damping performance at high temperature is good and Since Al contains Al, it has excellent high-temperature oxidation resistance and can be used in a wide temperature range. In addition to this, as the damping alloy steel, graphite cast iron, Fe-C-Si-based alloy (including rolled cast iron), Fe-Cr-based alloy, Fe-Cr-Al-based alloy, Fe-Cr-Mo-based alloy, etc. Yes, it is within the scope of the present invention.

Further, a member which belongs to damping alloy steel and has ferromagnetism has a characteristic that the damping property is deteriorated by a slight plastic working. However, as in the present invention, the process of performing the fusing treatment after thermal spraying is performed. As a result, all residual stress remaining in the vibration-damping alloy steel is released, so that the vibration-damping performance is completely recovered, which is an advantage as a method for forming a wear-resistant film that also has performance recovery processing.

Further, blast treatment is indispensable as a pretreatment for thermal spraying. However, when this treatment is applied to a vibration-damping alloy steel member, the vibration-damping performance is deteriorated due to the influence of blasting, especially when the plate thickness is thin. However, in the present invention in which the thermal spray coating is subjected to the fusing treatment, the influence of the blast processing can be completely eliminated. Also known as the problem peculiar to vibration-damping alloy steel, "the vibration-damping performance that decreases with a large impact load due to the shape with sharp notches" is also prevented by the hardened, wear-resistant, and highly-adhesive fusing sprayed coating of the present invention. be able to.

Regarding the thermal spray material, for example, JIS
It is preferable to use Ni-based and Co-based self-fluxing alloys defined in H 8303 (1989). Its chemical composition is as follows. The Ni-based alloy has the following composition (wt
%) Is desirable. As main components, Cr: 0 to 20%, B: 1.0 to 4.5%, Si: 1.5 to 5.0%, C: 1.1% or less, Fe: 5% or less, Co: 1% or less, Mo: 4% or less, Cu : 4% or less, Ni: alloy which is the balance.

As the Co-based alloy, the following composition (w
t%) is desirable. As the main component, Ni: 0-30%, Cr: 16-24%, B: 1.5-2.4%, Si: 1.5-4.5%, C: 1.5% or less, Fe: 5% or less, Mo: 7% or less, W: 4 to 15% or less, Co: alloy that is the balance. When higher wear resistance is required, it is possible to mix one or more kinds of carbide powders such as WC, Cr ₃ C ₂ , NbC, TiC, and Tac in these alloys in an amount of 20 to 80% by volume. desirable. Only the main components of the Ni-based alloy and the Co-based alloy are described, but there is no substantial difference in the performance even if they include unavoidable impurities such as P and S.

The thermal spraying method is usually an atmospheric plasma spraying method or a thermal spraying method using a combustion flame of a combustible gas and oxygen as a heat source, and then depositing the film in the atmosphere, in a vacuum, or in an inert gas atmosphere. Maintain at 950 to 1250 ℃ for 15 minutes to several hours. By this treatment, the sprayed coating is melted and densified, and also penetrates into the base material to cause metallurgical bonding.

The coating hardness is Vickers hardness, Hv: 500-
Hv: 1000 to 1800 is reached for a film in which 800 and carbides are dispersed, and the film quality is extremely hard and excellent in wear resistance as compared to damping steel. In addition, the alloy type damping steel, which has undergone plastic working due to the heat during the fusing treatment and whose damping performance has deteriorated, has the effect of recovering the performance.

[0024]

Example 1 In this example, the wear resistance of a member obtained by forming a thermal sprayed fusing coating of the present invention on a vibration damping alloy steel member was examined under the following conditions. 1. Abrasion resistance test equipment and test conditions Abrasion test equipment: Ogoshi-type wear test equipment Counterpart material: SK-D11 Quenched and tempered material Abrasion distance: 200 mm Abrasion speed: 0.37 m / s Load: 3.3 kg

2. Test film and material 2-1 Film of the present invention 2.5% Al-0.5% Si-remaining JI on the surface of Fe material
SH 8303, MSFNi 2 film formed by flame spraying (film thickness 1 mm), and then heated and melted in the atmosphere. The same film as above with WC fine powder added to 30 wt% was used as a thermal spray material to form a film by plasma spraying (film thickness 1 mm) and then heated and melted in Ar JIS H 8303, MSFCo1 A film was formed (film thickness 1 mm) in the same manner as that used.

2-2 Materials Used as Comparative Examples Carbon Steel: SS400 2.5% Al-0.5 Si-Remainder Fe Synthetic Resin Composite Damping Plate Table 1 summarizes the wear test results. Here, the wear reduction is the weight reduction ratio of the coating of the present invention and MSFNi2.
The wear resistance of each test material was compared as 0. As is clear from these results, since SS400, which is used as a general structural steel material, commercially available alloy type damping steel, and commercially available composite type damping steel, are all soft, three times as much as the film of
The amount of wear was 3.8 times.

On the other hand, the fused thermal sprayed coating of the present invention exhibits a relatively high hardness and therefore has a small amount of wear loss. In particular, the coating in which WC is dispersed in the thermal spray material has a weight loss of 50% of the standard coating. It was confirmed that the abrasion resistance was extremely excellent.

[0028]

[Table 1]

Example 2 The film of the present invention prepared in Example 1 was applied at 700 ° C. (in Ar) ×
A thermal shock test was conducted by heating in water at 20 ° C after heating for 15 minutes, and the film was sound without peeling even after repeating 10 times. On the other hand, Al ₂ O ₃ , A
In the coating of ceramics sprayed with l ₂ O ₃ · 40 wt% TiO ₂ or the like, 50% or more of the coating was peeled off after repeating 5 to 6 times.

Example 3 In this example, the loss coefficient was experimentally measured in order to investigate the damping performance of the alloy-type damping steel pipe on which the thermal sprayed fusing coating of the present invention was formed. 1. Test Steel Pipes (1) The following steel pipes (size of raw pipe: 114 mm diameter x 300 m length)
m × thickness 4.5 mm) with the coating of the present invention 2.5 mm Al-0.5% Si-remaining Fe alloy-type damping steel tube after JIS H8303, MSFNi4 was formed by flame spraying (sprayed film thickness 1 mm) Heated at 1050 ° C for 20 minutes and then allowed to cool. Same as above, spray coating 2mm. (2) The steel pipe used as a comparative example (the raw pipe size is the same as 1, 1) is directly subjected to the fusing treatment (1050 ° C × 20
Heated for a minute and then allowed to cool) The raw tube was heated at 950 ° C for 1 hour, and then left to cool, as it was. A carbon steel tube with a thermal spray coating (film thickness 1 mm) formed. Carbon steel tube with a thermal spray coating. Formed (thickness 2 mm)

2. Loss coefficient measurement method The two suspension free damping method was used. In this method, the steel pipe is horizontally suspended at the two nodes, hit with a hammer, the acceleration is measured by an acceleration sensor attached to the steel pipe, and the loss coefficient is measured from the vibration damping. Is the way.

The results of loss factor measurement are shown in FIG. From this result, the following can be recognized. The damping steel blank of the comparative example (No. 3) has a small loss coefficient because it has undergone processing history in the pipe making process, but if this is normalized at 950 ° C (No. 4), the damping steel's original large It shows the loss factor. Even if the temperature is changed to normalizing and the fusing conditions of the thermal spray coating are heated, a considerable recovery is seen (No. 5).

From this phenomenon, it is suggested that the effect of blasting, which is carried out as a pretreatment for thermal spraying, is considerably improved by the heating temperature during the fusing treatment. On the other hand, even if the thermal spray coating of the present invention is formed on a carbon steel pipe having low vibration damping performance (Nos. 6 and 7), the loss factor is small and no effect is recognized. On the other hand, by forming a thermal spray coating on the damping steel pipe,
The fused products (Nos. 1 and 2) have a relatively high loss coefficient, and it is recognized that they can be practically used even in the film-formed state.

[0034]

EFFECTS OF THE INVENTION As is clear from the above examples, the alloy steel member having the vibration damping performance is obtained by subjecting the alloy steel member having the Ni-based or Co-based self-fluxing alloy to the thermal spray deposition and then the fusing treatment to the vibration damping. It has the effect of improving wear resistance while maintaining performance. In addition, the fusing film is metallurgically bonded to the damping steel, so it does not peel off, and it also has the advantage of increasing the effect of releasing the various residual stresses that the damping steel had before the thermal spraying process. It can be effectively used in a work environment where abrasion resistance is required in a wide temperature range.

[Brief description of drawings]

FIG. 1 is a comparison of the measured loss coefficient of a damping steel pipe that has been subjected to a fusing treatment after the formation of the self-fluxing alloy sprayed coating of the present invention, with the steel pipes of Comparative Examples.

Claims (6)

[Claims] 1. A vibration-damping alloy steel member having wear resistance in which a Ni-base or Co-base self-fluxing alloy is spray-coated on the surface of the vibration-damping alloy steel member. 2. The vibration-damping alloy steel member having wear resistance according to claim 1, wherein the Ni-based self-fluxing alloy has the following composition (the composition is wt%): As main components, Cr: 0 to 20%, B: 1.0 to 4.5%, Si: 1.5 to 5.0%, C: 1.1% or less, Fe: 5% or less, Co: 1% or less, Mo: 4% or less, Cu : 4% or less, Ni: balance. 3. A vibration-damping alloy steel member having wear resistance according to claim 1, wherein the Co-based self-fluxing alloy has the following component composition (the component composition is wt%). As the main component, Ni: 0-30%, Cr: 16-24%, B: 1.5-2.4%, Si: 1.5-4.5%, C: 1.5% or less, Fe: 5% or less, Mo: 7% or less, W: 4 to 15% or less, Co: The balance. 4. The Ni-based alloy or the Co-based alloy contains 20 to 80% by volume of carbide particles of any one or more of WC, Cr ₃ C ₂ , NbC, TiC, and TaC, respectively. Item 4. A vibration-damping alloy steel member having wear resistance according to Item 3. 5. A spray-deposited Ni-based or Co-based self-fluxing alloy is formed on the surface of a vibration-damping alloy steel member, and this is subjected to a fusing treatment to densify the film and perform metallurgical bonding with the alloy steel base material. A method for producing a vibration-damping alloy steel member having wear resistance, characterized in that the vibration-damping performance is recovered or maintained by utilizing heat of fusing treatment. 6. A vibration-damping alloy steel formed by spray-coating the Ni-base or Co-base self-fluxing alloy at a temperature of 950 to 1250 ° C.
6. Wear resistance according to claim 5, characterized in that, by heating for 15 minutes or more, the hardness and adhesion of the coating are improved and the damping performance of the damping alloy steel is restored or maintained. Manufacturing method of damping alloy steel member.