宽厚板轧机传动轴虎口裂纹产生原因分析  

Analysis of Crack Forming Causes at the Hub of Transmission Shaft for the Wide and Heavy Plate Mill

作　　者：吴军 邬早勤 谢广明[2] 王磊[3] Wu Jun;Wu Zaoqin;Xie Guangming;Wang Lei(Tangshan Wenfeng Special Steel Co.,Ltd.;State Key Laboratory of Rolling&Automation,Northeastern University;School of Materials Science and Engineering,Hebei University of Technology)

机构地区：[1]唐山文丰特钢有限公司 [2]东北大学轧制技术及连轧自动化国家重点实验室 [3]河北工业大学材料科学与工程学院

出　　处：《宽厚板》2023年第2期42-44,共3页Wide and Heavy Plate

摘　　要：通过对轧机传动轴虎口裂纹分析,发现裂纹首先在传动轴虎口内壁形成,在后期使用过程中逐渐发生疲劳扩展,最终产生脆性断裂。金相组织观察结果表明:裂纹周围组织主要为属于脆性组织的淬火马氏体,回火屈氏体偏少,说明回火工艺不合理;存在残余组织应力,易于在使用过程中开裂。轧制过程中咬钢瞬间电流达到7069 A,比额定电流3096 A高出2倍以上,说明轧制过程中存在主传动轴瞬间冲击载荷过载现象。By analyzing the crack at the hub of transmission shaft on the rolling mill,it is found that the crack firstly forms in the inner wall of the transmission shaft hub,then fatigue propogation gradually occurs in the process of application,and brittle rupture happens finally.The metallographic mirostructure observation results show that the microstructure adjacent to the crack is mainly quenched martensite belonging to brittle microstructure with less quenched troostite,which indicates that the tempering process is irrational,residual microstructure stress exists,the crack probably occurred in the process of transmission shaft operation.The transient current of 7069 A at biting-in during rolling is higher than twice of the rated current 3096 A,indicating that instantaneous impact overload of the main transmission shaft exists during rolling.

关 键 词：传动轴 虎口裂纹 脆性断裂 冲击载荷 

分 类 号：TG333.7[金属学及工艺—金属压力加工]