30CrMnSiNi2A超高强度钢电子束焊接头的低周疲劳性能  

Low-cycle Fatigue Property of Electron Beam Welded Joint of 30CrMnSiNi2A Ultra-high Strength Steel

作　　者：王浩军 张颖云 李玉杨 龙健 马政雄 张林杰[2] WANG Haojun;ZHANG Yingyun;LI Yuyang;LONG Jian;MA Zhengxiong;ZHANG Linjie(AVIC Xi'an Aircraft Industry Group Co.,Ltd.,Xi'an 710089,China;State Key Laboratory of Mechanical Behavior for Materials,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]中航西安飞机工业集团股份有限公司,陕西西安710089 [2]西安交通大学金属材料强度国家重点实验室,陕西西安710049

出　　处：《热加工工艺》2022年第23期58-62,共5页Hot Working Technology

摘　　要：对26 mm厚的30CrMnSiNi2A超高强度钢板电子束焊接头和母材的低周疲劳性能进行了研究。结果表明:母材的低周疲劳性能稍优于接头的,母材和接头的应变疲劳极限分别为0.50%和0.48%。电子束焊接头的疲劳断裂位置在母材区。二者的疲劳裂纹源均在试样表面,且呈现多源启裂特征;疲劳裂纹扩展区均呈典型的疲劳辉纹,最后拉伸断裂区有大量韧窝,呈现韧性断裂特征。接头母材、热影响区和焊缝区组织较为相似,均为回火马氏体,但焊缝区晶粒尺寸较大。The low-cycle fatigue properties of 26 mm thick 30CrMnSiNi2A ultra-high strength steel plate electron beam welded joint and base metal were studied. The results show that the low-cycle fatigue performance of the base metal is slightly higher than that of the joint, and the strain fatigue limits of the base metal and the joint are 0.50% and 0.48%, respectively. The fatigue fracture position of the welded joint is in the base metal. The fatigue crack sources are all on the surface of the samples,showing the characteristics of multi-source cracking, the fatigue crack propagation areas show typical fatigue lines. Lots of dimples are found in the final tensile fracture zone. The microstructure of the base metal, heat affected zone and weld metal of the joint is similar, which is tempering martenite, but the grain size of the weld metal is bigger.

关 键 词：30CrMnSiNi2A超高强度钢 电子束焊接 低周疲劳性能 断口形貌 

分 类 号：TG456.3[金属学及工艺—焊接]