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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.54  No.12 (2013)  >  pp.2180-2184

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Microstructural Evolution and Mechanical Response of the Surface of 18CrNiMo7-6 Steel after Multistep Shot Peening during Annealing

Peng Fu1) 2), Chuanhai Jiang1), Vincent Ji3)
1) School of Materials Science and Engineering, Shanghai Jiao Tong University 2) School of Materials Science and Engineering, Liaocheng University 3) LEMHE/ICMMO, UMR 8182, Université Paris-Sud 11

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.

shot peening, line profile analysis, residual stress relaxation, micro-structure, micro-hardness

Received: July 29, 2013
Accepted: September 03, 2013 , Published online: November 25, 2013
Copyright © 2013 The Japan Institute of Metals and Materials



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