ER70S-6焊丝钢拉拔断裂原因  

Causes of ER70S-6 welding wire steel drawing fracture

作　　者：孟祥英 牛震 MENG Xiangying;NIU Zhen(Jianlong Beiman Special Steel Co.,Ltd.,Qiqihar 161041,China)

机构地区：[1]建龙北满特殊钢有限责任公司,齐齐哈尔161041

出　　处：《理化检验（物理分册）》2023年第9期19-22,共4页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：采用化学成分分析、力学性能测试、金相检验、硬度测试、扫描电镜及能谱分析等方法对ER70S-6焊丝钢拉拔断裂的原因进行分析。结果表明:ER70S-6焊丝钢在拉拔时断口呈“笔尖状”的主要原因是原料内部存在异常未变形的贝氏体组织,以及存在大尺寸非金属夹杂物;断口呈“劈裂状”的原因是表面存在磕伤缺陷。The causes of ER70S-6 welding wire steel drawing fracture were analyzed by chemical composition analysis,mechanical property test,metallographic examination,hardness test,scanning electron microscope and energy spectrum analysis.The results show that the main reason for the“pen-point”fracture of ER70S-6 welding wire steel during drawing were the abnormal undeformed bainite structure and the existence of large-size nonmetallic inclusions in the raw material.The reason for the“splitting”fracture was that there were knock defects on the surface.

关 键 词：ER70S-6焊丝钢 “笔尖状”断口 “劈裂状”断口 贝氏体 非金属夹杂物 

分 类 号：TB31[一般工业技术—材料科学与工程] TG115.2[金属学及工艺—物理冶金]