摘要
为了研究激光冲击处理对GH625高温合金抗疲劳性能的影响,采用激光冲击强化技术处理厚度为2 mm的GH625高温合金板材。分析了GH625高温合金激光冲击处理前后的微观组织、物相组成、残余应力、断口、疲劳寿命等方面的变化。结果表明:与母材相比,激光冲击处理后试样的表层晶粒细化;试样的表层残余应力状态发生改变,由原始的拉应力(5 MPa~16 MPa)变为压应力(-526 MPa),激光冲击后的残余压应力影响深度可达1.5 mm;激光冲击试样的疲劳寿命是母材试样的3.05倍。表层晶粒细化、残余压应力和加工硬化是激光冲击强化技术提升GH625抗疲劳性能的重要原因。
In order to study the effect of laser shock peening on the fatigue resistance of GH625 superalloy,GH625 superalloy plate with thickness of 2 mm was treated by laser shock peening.The changes of microstructure,phase composition,residual stress,fracture and fatigue life of GH625 superalloy before and after laser shock peening were analyzed.The results show that the surface grain of the sample after laser shock peening is finer than that of the base metal;The surface residual stress state of the sample is changed from the original tensile stress(5~16 MPa)to compressive stress(-526 MPa),and the influence depth of residual compressive stress after laser shock peening can reach 1.5 mm;The fatigue life of laser shock peenging specimen is 3.05 times that of base metal specimen.Surface grain refinement,residual compressive stress and work hardening are important reasons for laser shock peening to improve the fatigue resistance of GH625.
作者
陈浩
葛茂忠
陆大兴
CHEN Hao;GE Maozhong;LU Daxing(School of Mechanical Engineering,Jiangsu University of Technology,Changzhou Jiangsu 213001,China)
出处
《激光杂志》
CAS
北大核心
2023年第7期38-43,共6页
Laser Journal
基金
江苏省科技成果转化项目(No.BA2018070)
江苏省自然科学基金面上项目(No.BK20151171)
江苏省研究生科研与实践创新计划项目(No.XSJCX21_02)。
作者简介
陈浩,硕士生,研究领域为主要激光冲击强化提升高温合金疲劳寿命,E-mail:1527010980@qq.com;通讯作者:葛茂忠,副教授,研究领域为激光加工方面研究。E-mail:gmzxjy@126.com。
