Combining the surface deformation strengthening of metal parts (such as surface shot peening, rolling, etc.) with the strengthening of gear heat treatment (including overall heat treatment and surface heat treatment) by high-frequency induction heating equipment can significantly improve its fatigue and contact fatigue strength and prolong machine parts. service life.
(1) Surface high temperature deformation quenching composite heat treatment process
The process of heating the surface of metal parts to austenitize, deforming the surface layer by rolling method at high temperature, and then implementing overall quenching is called surface high temperature deformation quenching composite heat treatment process. This process can significantly improve the fatigue strength and wear resistance of metal parts.
(2) Pre-cooling surface high temperature deformation quenching composite heat treatment process
Pre-executing cold deformation strengthening of 1000-3000kN pressure on metal parts, and then performing high-temperature deformation quenching heat treatment on the surface can also exert the genetic effect of cold deformation and obtain a better strengthening effect. Pre-cooling deformation can make steel parts form high residual stress during high temperature deformation heat treatment on the surface, which can significantly improve their fatigue limit, wear resistance and surface roughness.
(3) Surface deformation aging composite heat treatment process
After strengthening the surface of metal parts by shot peening or rolling, the fatigue strength of metal parts can be further improved by using high-frequency induction heating equipment for supplementary aging (low temperature tempering). The relationship curve between contact fatigue strength and rolling force of 40 and 40Cr steel after surface quenching, which shows that after surface quenching and low temperature tempering (aging), the steel is subjected to rolling (under a certain range of rolling force) surface deformation strengthening, It can also greatly improve the contact fatigue strength of parts.
(4) Composite heat treatment process of surface deformation and chemical heat treatment
Surface deformation can not only accelerate the chemical heat treatment process, but also enhance the strengthening effect of heat treatment, which is worthy of attention. Effect of Surface Deformation Processes on Diffusion Both deformation and stress can accelerate the diffusion capacity of iron and carbon atoms in steel. This is because with the increase of deformation and stress, the defects in steel (such as dislocation density, etc.) increase, which makes the diffusion ability of iron atoms stronger. The effect of deformation on the diffusion ability of interstitial atoms is more complicated, and it is often necessary to select appropriate deformation and post-heat treatment conditions to accelerate the diffusion ability of carbon or nitrogen elements.
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GS-ZP-1200
