非金属夹杂物引起的螺栓低周疲劳断裂分析  

Analysis on low cycle fatigue fracture of bolts induced by nonmetallic inclusions

作　　者：陈盛杰 张丽 纪良浩[3] 于杰 杨龙龙 王刚 王复栋[1] CHEN Shengjie;ZHANG Li;JI Lianghao;YU Jie;YANG Longlong;WANG Gang;WANG Fudong(College of Materials Science and Engineering,Yingkou Institute of Technology,Yingkou 115014,China;School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,China;Ansteel Engineering Technology Corporation Limited,Anshan 114021,China)

机构地区：[1]营口理工学院材料科学与工程学院,辽宁营口115014 [2]辽宁科技大学材料与冶金学院,辽宁鞍山114051 [3]鞍钢集团工程技术有限公司,辽宁鞍山114021

出　　处：《辽宁科技大学学报》2022年第5期321-328,共8页Journal of University of Science and Technology Liaoning

基　　金：辽宁省大学生创新创业训练计划(S202214435027)。

摘　　要：某汽车厂40Cr钢螺栓在仅使用一天的情况下发生断裂,为了分析其断裂的原因,本文采用全自动钢中非金属夹杂物分析软件,结合电镜、能谱、传统的金相评级法对其微观组织、夹杂物分布、大小及形态进行分析,发现断口中存在尺寸偏大并且数量较多的硫化物夹杂;开裂源位置存在大量二次裂纹,裂纹扩展区疲劳纹较宽;断口形貌主要为脆性沿晶和穿晶解理,沿晶晶界上有“撕裂棱”氢脆特征。In order to analyze the fracture of a 40Cr steel bolt of an automobile factory after only one day use,the automatic analysis software of nonmetallic inclusions in steel,combined with electron microscopy,energy spectrum,and traditional metallographic rating method,are used to analyze the microstructure and the distribution,size,and morphology of the inclusions.The results show that many large sulfide inclusions exist in the fracture,a large number of secondary cracks exist in the crack source location,and the fatigue striations are relatively wide in the crack propagation zone.The fracture morphology presents mainly brittle intergranular and transgranular cleavage,with hydrogen embrittlement characteristics of tearing edges along the grain boundaries.

关 键 词：疲劳断裂 非金属夹杂物 螺栓 

分 类 号：TG115[金属学及工艺—物理冶金]