Principle of stress-relief heat treatment
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Could some expert explain the metallurgical principles behind stress-relief heat treatment?
When the material is heated to a certain temperature, the stress caused by deformation processing or welding allows the lattice distortion to be restored, thereby achieving stress relief.
When a certain temperature is reached, the accelerated diffusion of metal structures or elements causes changes in the structure, which in turn leads to changes in properties.
During stress-relief heat treatment, residual stresses decrease as the yield strength of the material drops during heating, and creep occurs, that is, high-temperature relaxation.