激光冲击强化与超声喷丸对1Cr11Ni2W2MoV不锈钢疲劳性能的影响  

Effects of Laser Shock Peening and Ultrasonic Shot Peening on Fatigue Property of 1Cr11Ni2W2MoV Stainless Steel

作　　者：赖志林[1] 汪诚[1] 李应红[1] 周留成[1] 何卫锋[1] 聂祥樊[1] 孙冬[1] 

机构地区：[1]空军工程大学等离子体动力学重点实验室,陕西西安710038

出　　处：《激光与光电子学进展》2013年第5期160-167,共8页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(51205406)资助课题

摘　　要：为了比较激光冲击强化与超声喷丸对1Cr11Ni2W2MoV不锈钢疲劳性能的影响,对未处理、超声喷丸处理和激光冲击强化处理三种状态试件进行常温振动疲劳试验,并通过X射线衍射、扫描电镜和透射电镜等手段分析两种技术提高疲劳寿命的机理。试验结果表明,在选定的工艺参数下,超声喷丸和激光冲击强化处理后,疲劳寿命分别提高了88.2%和280.1%,形成的表面残余应力分别为-545 MPa,-810 MPa,残余压应力深度分别为0.4mm,1.8mm,表面硬度由392HV分别提高到434HV、405HV;超声喷丸形成的组织细化层和纳米晶层较深。经分析,激光冲击强化对1Cr11Ni2W2MoV不锈钢常温疲劳性能的提高优于超声喷丸主要与其产生的高残余压应力和低粗糙度影响有关。In order to compare the effects of laser shock peening （LSP） and ultrasonic shot peening （USP） on fatigue property in 1Cr11Ni2W2MoV stainless steel, vibration fatigue tests of three different samples are conducted at 20 ℃, X-ray diffractometry （XRD）, scanning electron microscopy （SEM） and transmission electron microscopy （TEM） are used to investigate the mechanism of fatigue property improvement. Experimentally, the fatigue lives of 1Crl 1NiZWZMoV stainless steel after USP and LSP are increased by 88.2 % and 280.1%, respectively. The surface residual stress after LSP is 810 MPa and the one after USP is --545 MPa, and the compressive residual stress depth after LSP and USP is 1.8 ram, 0.4 mm, respectively. The surface microhardness after LSP and USP increases from 392 HV to 434 HV and 405 HV, respectively. The microstructure studies demonstrate that USP has an advantage in microstructure refinement and surface nanocystallines. We come to the conclusion that the residual stress and the small influence to the roughness make great contributions to the superiority of LSP in the improvement in fatigue property of 1CrllNi2W2MoV stainless steel over USP at 20℃.

关 键 词：激光技术 激光喷丸 超声喷丸 1Cr11Ni2W2MoV不锈钢 疲劳寿命 残余应力 纳米晶层 

分 类 号：TG665[金属学及工艺—金属切削加工及机床] TG142.24[一般工业技术—材料科学与工程]