Modification method for improving surface nano indentation property of material

Abstract

The invention discloses a modification method for improving the surface nano indentation property of a material. The modification method combines three technologies of mechanical shot blasting, surface alloying and laser shock peening effectively, parts realize the surface nanocrystallization and alloying modification through shot blasting and pack aluminization, and the surfaces of the parts are subjected to laser shock peening complex treatment. The sequence of the technologies improves the surface nano uniformity of the material greatly, and shortens the diffusion time; meanwhile, the high-ductility deformation of the material is caused, and high-amplitude residual compressive stress is applied on the surface of the material, and the surface of the material is subjected to high-density dislocation. The parts prepared by the peening method have a good nano indentation property, high abrasive resistance, high corrosion stability and high temperature oxidation resistance, and the fatigue lives of the parts at the normal temperature and high temperature are prolonged greatly.

Description

technical field [0001] The present invention relates to the field of material processing and metal surface nanotechnology, in particular to the method of using a composite treatment technology to obtain surface nanometer properties, improve the fatigue performance of metal materials and alloy materials under normal temperature and high temperature fatigue conditions, and prolong the fatigue life of workpieces , especially suitable for nanoparticle modification on the surface of high-temperature components such as aerospace, nuclear energy, machinery manufacturing and petrochemical industries. Background technique [0002] In recent years, in the fields of aerospace, petrochemical and machinery manufacturing, more and more components need to operate in high-temperature, highly corrosive, and highly oxidative environments, so component materials are required to have good high-temperature fatigue characteristics and oxidation resistance. . The instability of most materials s...

AI Technical Summary

Problems solved by technology

The aluminide coating obtained by this method has good high temperature oxidation resistance, corrosion resistance, wear resistance and high temperature fatigue life, but the efficiency of laser shock treatment is low, the single treatment area is small, and the uniformity of the overall treatment is not good

Mechanical shot peening can refine the grains, improve the fatigue strength of the material, realize the rapid diffusion of atoms at the same time, shorten the time of aluminizing, and the surface integrity of the workpiece after shot peening is relatively uniform, but the material after shot peening and aluminizing If the roughness of the surface layer increases, if repeated shot peening is performed, the mechanical wear of the workpiece surface will be large, which is not conducive to the high-temperature fatigue performance of the material; the laser shock energy is concentrated, the surface treatment depth is large, and there is no mechanical damage and thermal stress damage to the workpiece surface, but the processing efficiency Low, single treatment area is small, multiple laser shocks still cannot guarantee the uniformity of the overall treatment

Images