770 MPa级调质铸钢液态金属致脆失效原因及相应防护对策  

Failure Reason and Protection Countermeasures on Liquid Metal Induced Embrittlement of 770 MPa Grade Quenched and Tempered Steel Casting

作　　者：杨永强 马晓健 王鹏[3] 刘露芊 郑春雷[3] YANG Yongqiang;MA Xiaojian;WANG Peng;LIU Luqian;ZHENG Chunlei(Joy Global(Tianjin)Mining Machinery Co.,Ltd.,Tianjin 300308,China;Tangshan Kaiyuan Welding Automation Technology Institute Co.,Ltd.,Tangshan 063000,China;Yanshan University,Qinhuangdao 066004,China)

机构地区：[1]久益环球(天津)装备制造有限公司,天津300308 [2]唐山开元自动焊接装备有限公司,唐山063000 [3]燕山大学,秦皇岛066004

出　　处：《腐蚀与防护》2024年第4期54-58,共5页Corrosion & Protection

摘　　要：采用金相显微镜、电子扫描显微镜等对某大型截面铸钢工件裂纹成因进行了分析。结果表明:开裂高强度调质铸钢,在热浸锌过程中,基体产生了垂直于表面的裂纹,裂纹长度约为3 mm,且裂纹沿晶开裂。能谱结果表明,裂纹中富含大量锌,为典型的液态金属致脆现象。针对此情况,在热浸锌工艺、焊接工艺、成型工艺、涂装体系等方面给出了避免产生液态金属致脆的防护对策。The causes of cracks in a large cross-section cast steel workpiece were analyzed using metallographic microscopy,electron scanning microscopy,and other methods.The results show that during the hot-dip galvanizing process of highstrength quenched and tempered cast steel,cracks perpendicular to the surface were generated in the matrix,with a crack length of about 3 mm,and the cracks cracked along the grain.The energy spectrum results indicated that the cracks contained a large amount of zinc,which was a typical liquid metal embrittlement phenomenon.In response to this situation,protective measures were proposed to avoid liquid metal embrittlement through hot-dip galvanizing process,welding process,forming process,coating system and other aspects.

关 键 词：液态金属致脆 调质铸钢 热浸锌 沿晶裂纹 

分 类 号：TG174.4[金属学及工艺—金属表面处理]