Abstract
The variations of micro-structure, residual stress and micro-hardness for 18CrNiMo7-6 steel after triple shot peening (SP) in function of annealing time and temperature were studied. X-ray diffraction line profile analysis (XRDLPA) was used to identify variation of micro-structure and residual stress relaxation behaviors on the top surface of 18CrNiMo7-6 steel after SP during isothermal annealing. The results show that the micro-strain, dislocation density, stored energy, compressive residual stress (CRS) and micro-hardness on the top surface of 18CrNiMo7-6 steel after SP decrease with the increase of annealing time. But the domain size increases with increasing annealing time at four different temperatures. Indeed, the change rates of micro-structure, residual stress and micro-hardness are bigger at a higher annealing temperature or for a longer annealing time.
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