【作者】 彭驰； 胡殿印； 毛建兴；

【Author】 PENG Chi;HU Dianyin;MAO Jianxing;School Of Aeronautic Science And Engineering,Beihang University;Development Research Center,Chinese Aeronautical Establishment;

【机构】 中国航空研究院发展研究中心； 北京航空航天大学航空发动机研究院；

【摘要】 本文对DD6材料试件进行喷丸处理,然后对喷丸处理件开展低循环疲劳试验,研究了喷丸处理后的微观组织和残余应力场,并对喷丸强化如何提高材料的疲劳寿命进行了探究。通过金相观测,分析了喷丸处理后的试件表层微观结构,并且在疲劳中断试验的基础上,探究了疲劳过程中表层微观组织的演变行为,为喷丸强化处理如何影响镍基单晶高温合金的疲劳寿命提供了解释,同时对比了有无喷丸强化处理对材料低循环疲劳寿命的影响。结果表明,喷丸对DD6合金产生了增殖位错强化作用,会产生随层深和测量角变化的残余应力场;喷丸强化处理可以提高试验件的疲劳寿命,强化效果会受到残余应力松弛以及显微畸变降低等因素的影响。更多还原

【Abstract】 In this paper,shot peening was performed on DD6 material specimens,and then low cycle fatigue tests were conducted on the shot peened parts to investigate the microstructure and residual stress field after shot peening,and to investigate how shot peening can improve the fatigue life of the material.The surface microstructure of the shot peened specimens was analyzed by metallographic observations,and the evolution of the surface microstructure during fatigue was investigated based on fatigue interruption tests to provide an explanation of how shot peening affects the fatigue life of nickel-based single crystal high temperature alloys,and to compare the effect of shot peening with and without shot peening on the low-cycle fatigue life of the material.The results show that shot peening produces a proliferative dislocation strengthening effect on DD6 alloy,which generates a residual stress field although the layer depth and measurement angle vary;shot peening treatment can improve the fatigue life of the test pieces,and the strengthening effect is affected by the residual stress relaxation and the reduction of microscopic distortion.更多还原