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A Method for Reducing Residual Stress and Increasing Hardness of GT35 Steel Bonded Cemented Carbide

A steel-bonded cemented carbide and residual stress technology, applied in the field of composite material processing, can solve the problems of reducing the service life of precision devices, affecting product quality, affecting the accuracy and reliability of inertial devices, and achieving the effect of simplifying the process

Active Publication Date: 2021-06-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the use of the alloy, the deformation of the alloy will reduce the precision of the device, affect the quality of the product, and reduce the service life of the precision device; the TiC-reinforced steel-bonded cemented carbide alloy with a mass fraction of 35% is mainly It is used to manufacture core parts such as motor bearings and end covers. The small deformation of parts will affect the accuracy and reliability of inertial devices

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The forged GT35 alloy was directly subjected to stress aging treatment, the heating temperature was 100°C, the loading stress was 200MPa, and the loading time was 24h to obtain a sample. The residual stress of the alloy surface obtained after this treatment is -162MPa, and the hardness of the cemented carbide is increased to 1012HV. Measure the dimensional change rate of the obtained product after being placed at room temperature for 30 days, and calculate A / B=0.5.

Embodiment 2

[0027] The forged GT35 alloy was directly subjected to stress aging treatment, the heating temperature was 200°C, the loading stress was 200MPa, and the loading time was 24h to obtain a sample. The residual stress on the surface of the alloy obtained after this treatment is -142MPa, and the hardness of the cemented carbide is increased to 1070HV. Measure the dimensional change rate of the obtained product after standing at room temperature for 30 days, and calculate A / B=0.55.

Embodiment 3

[0029] The forged GT35 alloy was directly subjected to stress aging treatment, the heating temperature was 150°C, the loading stress was 250MPa, and the loading time was 8h to obtain a sample. The residual stress of the alloy surface obtained after this treatment is -134MPa, and the hardness of the cemented carbide is increased to 1034HV. Measure the dimensional change rate of the obtained product after standing at room temperature for 30 days, and calculate A / B=0.62.

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Abstract

The invention relates to a method for reducing the residual stress of GT35 steel-bonded hard alloy and improving its hardness, belonging to the technical field of composite material processing. In the present invention, the forged GT35 steel-bonded hard alloy is used as a raw material, and the raw material is directly subjected to stress aging treatment to obtain a product; during the stress aging treatment, the tensile stress loaded on the raw material is 200-400MPa, and the temperature is 50-300°C , the time is greater than 0.5h. The reduction range of the surface residual stress of the product obtained in the present invention is 86-218 MPa, and the hardness increase range of the alloy is 157-260 MPa. The present invention simplifies the treatment process of GT35 steel-bonded hard alloy, and the obtained product has excellent performance, which is GT35 steel-bonded hard alloy Low-cost applications provide the necessary conditions.

Description

technical field [0001] The invention relates to a method for reducing the residual stress of GT35 steel-bonded hard alloy and improving its hardness, belonging to the technical field of composite material processing. Background technique [0002] Because steel-bonded cemented carbide has excellent comprehensive properties such as high hardness, high strength, low density and low thermal expansion coefficient, it is widely used in the fields of tools and molds, strategic weapons, aerospace and other fields. During the use of the alloy, the deformation of the alloy will reduce the precision of the device, affect the quality of the product, and reduce the service life of the precision device; the TiC-reinforced steel-bonded cemented carbide alloy with a mass fraction of 35% is mainly It is used to manufacture core parts such as motor bearings and end covers. The small deformation of parts will affect the accuracy and reliability of inertial devices. The dimensional stability o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/18
CPCC21D1/18Y02P10/20
Inventor 肖来荣赵小军涂晓萱韦道明蔡圳阳沈鸿泰
Owner CENT SOUTH UNIV