32Cr3Mo1V连铸圆坯端部锯切缺陷的原因分析及工艺改进  

Cause analysis and process improvement of end sawing defect of 32Cr3Mo1V continuous casting round billet

作　　者：轩康乐 张新文[1] 俞杰 黄笑笑 张春香 XUAN Kangle;ZHANG Xinwen;YU Jie;HUANG Xiaoxiao;ZHANG Chunxiang(Special Steel Company,Jiangsu Yonggang Group Co.,Ltd.,Zhangjiagang 215628,China)

机构地区：[1]江苏永钢集团有限公司特钢公司,江苏张家港215628

出　　处：《物理测试》2023年第2期48-52,共5页Physics Examination and Testing

摘　　要：32Cr3Mo1V连铸圆坯端部在锯切时发现缺陷,采用扫描电镜分析断口形貌,金相显微镜分析组织,并配合布氏硬度仪进行硬度分析,找出32Cr3Mo1V连铸圆坯端部锯切缺陷的原因为完全退火不彻底,存在较多的贝氏体组织,较大的组织应力在锯切下料时在锯条切口处产生应力集中,在珠光体内萌生裂纹,裂纹逐步扩展引起宏观开裂。通过提高退火温度、延长保温时间、增加升温及降温平台,使问题得到解决。The defects were found at the end of 32Cr3Mo1V continuous casting round billet during sawing.The fracture morphology was analyzed by the scanning electron microscope,the microstructure was observed by the metallographic micro⁃scope.The hardness analysis was carried out with Brinell hardness tester.It was found that the reason for the sawing de⁃fects at the end of 32Cr3Mo1V continuous casting round billet was the incomplete annealing.There were many bainite structures.The larger structural stress produced stress concentration at the saw blade notch during sawing and blanking.The cracks were generated in pearlite.The gradual propagation of cracks caused the macroscopic cracking.By increasing the annealing temperature,prolonging the holding time,and increasing the heating and cooling platform,the problem could be solved.

关 键 词：应力裂纹 组织应力 完全退火 

分 类 号：TG333.17[金属学及工艺—金属压力加工] TG115