RM2锻棒断裂原因分析  

Analysis of Fracture Reason of RM2 Forging Rod

作　　者：徐辉 宋祖峰[2] 牟祖茂 王德宝[2] XU Hui;SONG Zu-feng;MU Zu-mao;WANG De-bao

机构地区：[1]马钢股份公司技术中心检验所,安徽马鞍山243000 [2]马钢股份公司技术中心,安徽马鞍山243000

出　　处：《安徽冶金科技职业学院学报》2022年第1期19-21,共3页Journal of Anhui Vocational College of Metallurgy and Technology

摘　　要：某厂RM2锻棒在锻造后进行正火+球化退火热处理,但是在后续粗加工过程中出现了裂纹。分析结果表明:RM2锻棒由于终锻温度偏高,碳化物偏析并且成网状分布,使得锻棒具有很大的脆性;在后续热处理过程中,原先的粗晶内细晶形核长大,并不能消除锻造粗晶,致使在外力作用的情况下出现沿晶脆裂,导致裂纹的产生[1]。RM2 forging bars in a factory underwent normalized and spheroidized annealing treatment after forging,but cracks appeared in the subsequent rough machining process.The analysis results show that because of the high final forging temperature,carbide segregation and network distribution,the RM2 forging bar has great brittleness.In the subsequent heat treatment process,the original fine grains within the coarse grain nucleated and grew up,and the forging of coarse grain could not be eliminated,resulting in intergranular brittle cracking under the action of external forces,leading to the generation of cracks.

关 键 词：RM2锻棒 网状碳化物 终锻温度 

分 类 号：TG115[金属学及工艺—物理冶金]