Numerical Calculation and Experimental Research on Residual Stresses in Precipitation-hardening Layer of NAK80 Steel for Shot Peening

作     者：MIAO Hong ZUO Dunwen WANG Min ZHANG Ruihong WANG Hongfeng 

作者机构：Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology Nanjing University of Aeronautics and Astronautics Nanjing 210016 China College of Mechanical Engineering Yangzhou University Yangzhou 225000 China 

出 版 物：《Chinese Journal of Mechanical Engineering》 (中国机械工程学报（英文版）)

年 卷 期：2011年第24卷第3期

页      面：439-445页

核心收录：

学科分类：080503[工学-材料加工工程] 070801[理学-固体地球物理学] 07[理学] 0817[工学-化学工程与技术] 08[工学] 0807[工学-动力工程及工程热物理] 0708[理学-地球物理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 0811[工学-控制科学与工程] 0801[工学-力学（可授工学、理学学位）] 080201[工学-机械制造及其自动化] 

基　　金：supported by National Natural Science Foundation of China (Grant No. 50772095) Jiangsu Provincial Key Laboratory of Precision and Micro-manufacturing Technology Foundation of China(Grant No. JSPM20 0705) 

主　　题：shot peening residual stress precipitation-hardening layer surface quality 

摘      要：Shot peening can improve fatigue strength of materials by creating compressive residual stress field in their surface layers,and offers a protection against crack initiation and propagation,corrosion,*** fatigue fracture and stress corrosion cracking of NAK80 steel parts are improved *** there lacks in-depth research in which the beneficial effect of the residual stress may be offset by the surface damage associated with shot peening,especially in terms of the research on the effective control of shot peening *** order to obtain the surface residual stress field of NAK80 steel after shot peening,the samples are shot peened by pneumatic shot peening machine with different *** residual stress in the precipitation-hardening layer of NAK80 steel is measured before and after a shot peening treatment by X-ray diffraction *** order to obtain true residual stress field,integral compensation method is used to correct *** setting up analytical model of the residual stress in the process of shot peening,the surface residual stress is calculated after shot peening,and mentioning the reason of errors occurred between calculated and experimental residual stresses,which is mainly caused by the measurement error of the shoot arc *** the same time,micro hardness,microstructure and roughness in the precipitation-hardening layer of NAK80 steel before and after shot peening were measured and surveyed in order to obtain the relation between shot peening strength and surface quality in the precipitation-hardening *** results show that the surface quality of NAK80 steel is significantly improved by shot peening *** over peening effect is produced when the shot peening intensity is too high,it is disadvantageous to improve sample＇s surface integrity,and leading to reduce the fatigue *** arc high value of optimal shot peening is 0.40 mm,the surface quality is the best,and the depth of residual stress in the precipit