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Metal-surface supersonic stress peening method

A metal surface and shot peening strengthening technology, which is applied in the field of metal surface strengthening, can solve the problems of low strengthening efficiency, no related reports on metal material shot peening strengthening, and thin strengthening layer, so as to achieve high reuse rate and improve shot peening efficiency. Effect, effect of strengthening layer thickness

Inactive Publication Date: 2005-06-22
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the shot-peening speed of shot-peening strengthening is generally 70-100m / s at home and abroad, and the most recently developed shot-peening speed in Japan is the strengthening shot-peening technology of 200m / s (Tadaji Kagaya, Surface Technology (Day), 2001, 52(2): 169; (Recent Trends in Shot Peening Technology)) and (Kagaya Tadashi, Kubota Pukan, Special Steel (Japan), 2000, 49(5): 33; ultrafine powder impact processing), and Maximum speed: 150-200m / s, micro-powder particle size: 40-60μm, its disadvantages are low strengthening efficiency and thin strengthening layer
[0004] In addition, the supersonic spraying process uses compressed air to obtain supersonic speed through the Lava nozzle, and sprays other metal materials or alloys with different properties from the base metal on the surface of the base to form a coating. However, there are no related reports on the use of supersonic jets to strengthen metal materials.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0015] The base material is 316L stainless steel pipe, and the projectile is Al 2 o 3 (The particle size of the projectile is about 150 microns) Use compressed air to carry the projectile, inject gas through the Lava nozzle to accelerate the projectile to 300-1100m / s, and continuously bombard the surface of the metal material to produce a residual compressive stress layer on the metal surface. The process parameters are as follows:

[0016] The spray distance is 70mm, the gas pressure is 3.0MPa, the gas temperature is room temperature, the gas flow rate is 30g / s, the power consumption is 12kW, the shot feeding voltage is 30V, the shot peening time is 6 minutes, and the average thickness of the surface strengthening layer is 75 microns according to X-ray diffraction analysis. about.

[0017] This embodiment adopts as figure 1 The supersonic spraying device shown is a Russian patent, and the patent numbers are respectively 1674585 (1991), 1603581 (1993), 1618778 (1993), 177307...

Embodiment 2

[0019] The difference from Example 1 is:

[0020] The matrix material is a carbon steel test piece, and the projectile adopts steel shot (about 100 microns), and the process parameters are as follows:

[0021] The spraying distance is 55mm, the gas pressure is 2.5MPa, the gas temperature is room temperature, the gas flow rate is 28g / s, the power consumption is 10kW, the shot feeding voltage is 25V, and the shot peening time is 10 minutes. According to X-ray diffraction analysis, the average thickness of the surface strengthening layer reaches 75 Microns or so.

Embodiment 3

[0023] The difference from Example 1 is:

[0024] The base material is a mold steel test piece, and the projectile uses nylon particles (about 200 microns). The process parameters are as follows:

[0025] The spray distance is 100mm, the gas pressure is 2.2MPa, the gas temperature is room temperature, the gas flow rate is 26g / s, the power consumption is 8kW, the shot feeding voltage is 20V, the shot peening time is 15 minutes, and the average thickness of the surface strengthening layer is 70 microns according to X-ray diffraction analysis. about.

[0026] In addition, the device used in the present invention can also adopt the cold air power spraying device in the Chinese patent application (application number is 01128130.8).

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Abstract

The invention relates to a metal surface strengthening technology, specifically a metal surface supersonic shot peening method, which is characterized in that compressed air is used to carry metal or non-metal projectiles, accelerate the projectiles to 300-1100m / s, and continuously bombard the surface of metal materials to make the metal surface A residual compressive stress layer is produced, and the process parameters are as follows: spraying distance 55-100mm, gas pressure 2.2-3.0MPa, gas temperature at room temperature, gas flow rate 26-30g / s, pellet feeding voltage 20-30V, pellet particle size 50- 200 microns. The present invention has the advantages of enhanced layer thickness, simple device, less energy consumption, and improved mechanical properties of the material (such as fatigue strength, abrasion resistance, and corrosion resistance under stress); in addition, the present invention has low cost, high utilization rate, and is applicable wide range.

Description

technical field [0001] The invention relates to metal surface strengthening technology, in particular to a metal surface supersonic shot peening strengthening method. Background technique [0002] It is generally believed that fatigue cracks occur in the tensile stress area of ​​the metal surface, and the existence of residual tensile stress accelerates the initiation and propagation of cracks, which eventually leads to the fracture of the material. On the contrary, the existence of residual compressive stress helps to improve the fatigue life. The wear resistance of the components is enhanced, and at the same time, it can effectively prevent stress corrosion and improve the corrosion fatigue life of the components. [0003] Shot peening can improve the fatigue resistance of metal parts and improve the mechanical properties of metal parts. Metal surface shot peening is very important to improve the fatigue life of metal parts. The formation of a residual compressive stress l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D7/06
Inventor 熊天英李铁藩吴杰金花子吴敏杰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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