保温时间对锌铁合金镀层热冲压钢开裂行为的影响  

Effect of Holding Time on Cracking Behavior of Zinc-iron Alloy Coated Hot Stamping Steel

作　　者：崔磊[1] 董标 晋家春 肖洋洋[1] 彭梦都 周世龙[1] 顾斌 CUI Lei;DONG Biao;JIN Jiachun;XIAO Yangyang;PENG Mengdu;ZHOU Shilong;GU Bin(Technology Center,Ma'anshan Iron&Steel Company Ltd.,Ma'anshan 243000,China)

机构地区：[1]马鞍山钢铁股份有限公司技术中心,安徽马鞍山243000

出　　处：《热加工工艺》2020年第9期117-119,共3页Hot Working Technology

摘　　要：通过表面镀锌铁合金的22MnB5基板在热冲压前炉内保温时间的变化,研究了热冲压后的镀层和基体裂纹形貌及镀层相结构的变化,探讨了保温时间对锌铁合金镀层热成形钢微观结构和开裂行为的影响。结果表明:随保温时间的延长,扩展到基体的裂纹长度变短,保温360 s时无裂纹扩展到基体;镀层主要由Zn含量较高的Γ-Fe3Zn10和Fe含量较高的α-Fe(Zn)组成;随保温时间的增加,部分Γ相转化为α-Fe(Zn)相,镀层中α-Fe(Zn)固溶相的比例增多。Through the change of holding time in furnace of Zn-Fe alloy coated hot stamping 22MnB5, the changes of crack morphology and phase structure of coating and substrate after hot stamping were studied, and the effect of holding time on microstructure and cracking behavior of hot-formed steel coated with Zn-Fe alloy was discussed. The results show that with the extension of the holding time, the crack length extending to the matrix becomes shorter, and no crack propagates to the matrix when the holding time is 360s. The coating is mainly composed of Γ-Fe3Zn10 with high Zn content and α-Fe(Zn)with high Fe content. With the increase of holding time, some Γ phase is transformed into α-Fe(Zn) phase, and the proportion ofα-Fe(Zn) solid solution phase increases in the coating.

关 键 词：锌铁合金镀层 热成形钢 保温时间 开裂 

分 类 号：TG306[金属学及工艺—金属压力加工]