不同标印工艺对2A70铝合金的低周疲劳性能的影响  

Effects of Different Marking Processes on Low Cycle Fatigue Properties of 2A70 Aluminum Alloy

作　　者：钱昆 高爽 杨林青 周松 胡馨月 QIAN Kun;GAO Shuang;YANG Linqing;ZHOU Song;HU Xinyue(AECC Shenyang Liming Aero-engine,Shenyang 110043,China;School of Mechatronics Engineering,Shenyang Aerospace University,Shenyang 110136,China)

机构地区：[1]中国航发沈阳黎明航空发动机有限责任公司,辽宁沈阳110043 [2]沈阳航空航天大学机电工程学院,辽宁沈阳110136

出　　处：《热加工工艺》2022年第24期41-44,共4页Hot Working Technology

基　　金：国家自然科学基金项目(51775355);沈阳航空航天大学青年博士科研启动基金项目(18YB05)。

摘　　要：材料的表面缺陷是影响疲劳寿命的重要因素,研究了激光标印和振动标印后2A70铝合金低周循环载荷下的低周疲劳行为。研究了标印对疲劳寿命的影响规律以及断裂机理。结果表明:经过振动标印后的2A70合金比母材的低周疲劳寿命下降69%,而激光标印后下降了99%;激光标印后的痕迹更为尖锐,导致的应力集中较大,从而使得低周疲劳性能下降、寿命降低。The surface defects of materials are important factors affecting the fatigue life. The low-cycle fatigue behavior of 2A70 aluminum alloy under low cycle load after laser and vibration labeling was studied, and the influence of labeling on the fatigue life and fracture mechanism were further studied. The results show that the low cycle fatigue life of 2A70 alloy after vibration marking reduces by 69% compared with that of the base metal, while reduces by 99% after laser marking.After laser marking, the trace is more sharp, resulting in a larger stress concentration, which can reduce the low cycle fatigue performance and life.

关 键 词：低周疲劳 2A70铝合金 微观组织 应力集中 

分 类 号：TG115[金属学及工艺—物理冶金]