Shot peening strengthening method for controlling strain hardening rate of high temperature alloy surface

A strain hardening rate, superalloy technology, applied in the field of shot peening and surface shot peening of metal materials, it can solve the problems of poor thermal stability of compressive stress field, not suitable for strengthening treatment of superalloy parts, and achieve a mature working principle. Effect

Inactive Publication Date: 2012-03-14
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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Problems solved by technology

[0004] The present invention is aimed at the deficiencies in the above-mentioned prior art and provides a shot peening method for controlling the strain hardening rate of the superalloy surface. Its purpose is to solve the poor thermal stability of the residual compressive stress field of the existing shot peening technology. It is not suitable for the strengthening treatment of superalloy parts

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  • Shot peening strengthening method for controlling strain hardening rate of high temperature alloy surface
  • Shot peening strengthening method for controlling strain hardening rate of high temperature alloy surface
  • Shot peening strengthening method for controlling strain hardening rate of high temperature alloy surface

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Embodiment Construction

[0017] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments:

[0018] The test material of this embodiment is a high temperature alloy GH4169, and the size of the shot peening sample is 20mm×20mm×20mm small squares.

[0019] The steps of the shot peening method for controlling the surface strain hardening rate of superalloys of the present invention are as follows:

[0020] (1) The surface residual compressive stress value, the depth of residual compressive stress and the maximum residual compressive stress value of the superalloy material are used as the three parameters to characterize the residual compressive stress field, and the X-ray diffraction residual stress measurement method is used to determine the shot peening from small to large Surface residual compressive stress value, residual compressive stress depth and maximum residual compressive stress value under strain hardening ...

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Abstract

The invention provides a shot peening strengthening method for controlling a strain hardening rate of a high temperature alloy surface, which comprises the following steps: 1, finding a critical strain hardening rate under a material saturated residual compressive stress field through a test; 2, determining shot peening strengthening technological parameters of the material critical strain hardening rate; and 3, utilizing the technological parameters obtained in step 2 to carry out shot peening strengthening treatment. Compared with the prior art, the technical scheme of the invention has the characteristic of low strain hardening rate, so the thermal stability of the shot peening residual compressive stress field is strong, the method is suitable for the surface peening treatment of metal parts used at a higher temperature so as to prolong the fatigue life of the metal parts and improve the fatigue resistance of the metal parts.

Description

Technical field [0001] The invention is a shot peening strengthening method for controlling the surface strain hardening rate of high-temperature alloys, and belongs to the technical field of surface shot peening strengthening of metal materials. Background technique [0002] Since aero-engines mostly fail in the form of fatigue, the requirements for fatigue performance are relatively high. The strength of advanced superalloy materials is getting higher and higher, but with that comes its high sensitivity to stress concentration, and its fatigue strength varies with K t The increase in value drops drastically. And the fatigue cracks of parts mostly originate in the stress concentration parts. Surface shot peening technology is often used in engineering to improve the fatigue performance and reliability of parts. [0003] The anti-fatigue mechanism of shot peening is as follows: the projectile impacts the surface of the material at high speed, introduces a residual compressive str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D7/06C22F1/00
Inventor 王强宋颖刚王欣田雅田帅
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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