2013 Volume 54 Issue 12 Pages 2180-2184
The variations of micro-structure, residual stress and micro-hardness for 18CrNiMo7-6 steel after triple shot peening (SP) against annealing temperature were studied. X-ray diffraction line profile analysis (XRDLPA) was used to identify the change of micro-structure and residual stress relaxation behaviors of the top surface for 18CrNiMo7-6 steel after SP. The results show that the micro-strain, dislocation density, stored energy, compressive residual stress (CRS) and micro-hardness of the top surface of 18CrNiMo7-6 steel after SP decrease with the increase of annealing temperature while the domain size increases with increasing annealing temperature. Meanwhile, the change rates of micro-structure the residual stress and micro-hardness are bigger at higher annealing temperatures.