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Process for improving performance of carbonitriding layer through laser shock peening

A technology of laser shock strengthening and carbonitriding, which is used in metal material coating process, coating, solid diffusion coating, etc. and other problems, to achieve the effect of improving dislocation density, improving fatigue performance, and improving service life

Inactive Publication Date: 2020-12-29
JIANGSU UNIV
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  • Description
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Problems solved by technology

However, the surface grains of the traditional carbonitriding layer are coarse, the mechanical properties are poor, and the wear resistance and corrosion resistance are insufficient.

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  • Process for improving performance of carbonitriding layer through laser shock peening
  • Process for improving performance of carbonitriding layer through laser shock peening

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Embodiment 1

[0026] 20Cr2Mn2Mo is a high-quality alloy steel, commonly used in the manufacture of high-speed and heavy-duty gears. It must have good wear resistance, corrosion resistance and fatigue properties in engineering practice, so it needs to be surface modified, carbonitriding is one of the most common ways. The laser shock strengthening of the carbonitriding layer of the alloy steel is beneficial to refine the surface grains, generate residual compressive stress, and improve the service life of the alloy steel. In the present invention, carbonitriding is carried out to 20Cr2Mn2Mo first, and then laser shock strengthening is carried out, which specifically includes the following steps:

[0027] Step 1: First, cut the annealed 20Cr2Mn2Mo wire into a cuboid with a volume of 20×20×10mm, and then use 400#, 800#, 1200#, 1500#, 2000# sandpaper for step-by-step grinding; then use 0.5~3.5 The metallographic polishing agent of μm specification is polished step by step to make the surface r...

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Abstract

The invention provides a process for improving the performance of a carbonitriding layer through laser shock peening. The process comprises the following steps: pretreating the surface of an annealedtarget material; putting the target material subjected to surface treatment into a vacuum furnace for carbonitriding, and carrying out low-temperature tempering on the target material subjected to carbonitriding; and arranging a restraint layer on the surface of the target material, and performing small-energy high-repetition-frequency laser shock on the surface of the target material through laser. The method can be used for refining surface layer grains, the surface hardness of the target material is improved again, large residual compressive stress is generated at a large depth, and generation of surface fatigue cracks is inhibited.

Description

technical field [0001] The invention relates to the fields of laser processing and heat treatment, in particular to a process for improving the performance of a carbonitriding layer by laser shock strengthening. Background technique [0002] Large-scale heavy-duty equipment has high requirements on the mechanical properties of its transmission gears, and is commonly made of materials such as 20CrMnTi and 20Cr2Mn2Mo. In order to ensure the toughness and impact resistance of the gear surface, the surface hardness and wear resistance of the gear are generally improved by the surface heat treatment process. The most common surface heat treatment processes are carburizing, nitriding, carbonitriding and other processes. After carburizing treatment, due to the poor adhesion of the carburized layer, it is easy to peel off when subjected to stress; after nitriding treatment, the hardened layer is very thin, which is not suitable for use in high-speed impact environments; carbonitrid...

Claims

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Application Information

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IPC IPC(8): C23C8/32C23C8/80C21D10/00
CPCC23C8/32C23C8/80C21D10/005
Inventor 任云鹏万瀚宇陆恒辛志铎李致宇
Owner JIANGSU UNIV
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