Thermostability of S30432 shot peened surface layer

The recrystallisation behaviour of S30432 shot peened deformation surface layer during isothermal annealing has been investigated by X-ray diffraction line profile analysis method. The results revealed that annealing time and temperature were two key parameters for isothermal annealing process of S30432 steel. With higher annealing temperature, the recrystallisation behaviour in the shot peened deformed layer was more obvious. Based on the results of line profile analysis, the recrystallisation activation energy and microstrain relaxation energy were calculated. In addition, after isothermal annealing, the depth distribution of domain size in the deformed layer was also investigated and discussed in details. According to the analysis, the results showed that the thermostability of S30432 shot peened surface layer was relatively stable when the annealing temperature was below 650°C.