High temperature mechanical properties and surface fatigue behavior improving of steel alloy via laser shock peening》.pdf

Materials and Design 53 (2014) 452–456 Contents lists available at ScienceDirect Materials and Design journal homepage: www.else /locate/matdes High temperature mechanical properties and surface fatigue behavior improving of steel alloy via laser shock peening N.F. Ren a, H.M. Yang a,⇑, S.Q. Yuan b, Y. Wang b, S.X. Tang a, L.M. Zheng a, X.D. Ren a,⇑, F.Z. Dai a a School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, PR China b Research Center of Fluid Machinery Engineering and Technical, Jiangsu University, Zhenjiang 212013, China a r t i c l e i n f o a b s t r a c t Article history: Laser shock peening was carried out to reveal the effects on ASTM: 410L 00C 12 microstructures and fati- r Received 27 March 2013 gue resistance in the temperature range 25–600 C. The new conception of pinning effect was proposed to Accepted 2 July 2013 explain the improvements at the high temperature. Residual stress was measured by X-ray diffraction Available online 20 July 2013 with sin2w method, a high temperature extensometer was utilized to measure the strain and control the strain signal. The grain and precipitated phase evolutionary process were observed by scanning elec- Keywords: tron microscopy. These results show that a deep layer of compressive residual stress is developed by laser Laser shock peening