冲压温度对镀锌22MnB5钢板镀层中裂纹的影响
Effect of Stamping Temperature on Cracks in Coating of Galvanized 22MnB5 Steel Plates
摘 要
利用扫描电子显微镜（SEM）及附带能谱仪系统（EDS），对在不同冲压温度下热成形后镀锌22MnB5钢板镀层中产生的裂纹进行了研究。结果表明：对钢板进行900℃保温5 min的均匀奥氏体化能够有效提高镀层中的Fe含量，使镀层中的液态Zn在热冲压后转变为固态的α-Fe（Zn）相，避免高温冲压时出现由液态金属导致的脆性（LMIE）裂纹；冲压后镀层中Zn含量为25%~30%（原子分数），能够为基体提供良好的阴极保护作用；冲压温度在Γ相熔点（782℃）以下时有利于减少镀层中的LMIE裂纹。
冲压温度
锌镀层
液态金属导致脆性(LMIE)
hot forming steel
stamping temperature
zinc coating
liquid metal induced embrittlement (LMIE)
Abstract
The cracks in the coating of galvanized 22MnB5 steel plates formed at different stamping temperatures were studied by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results show that homogeneous austenitization at 900℃ for 5min of the steel plates could improve the Fe content in the coating, and Zn liquid was transformed into solid α-Fe (Zn) to avoid the occurrence of liquid metal induced embrittlement (LMIE) cracks in high temperature stamping process. The Zn content in the coating after stamping was 25%-30% (atom), which could provide good cathodic protection for the substrate. It was helpful to reduce LMIE cracks in the coating when the stamping temperature was below the melting point of Γ phase (782℃).
中图分类号 TG156.1 DOI 10.11973/fsyfh-201804012
所属栏目 试验研究
基金项目 北京市科技计划项目（D151100003515001）
收稿日期 2016/11/1
修改稿日期
网络出版日期
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引用该论文: QIU Xiaopan,ZHANG Jie,JIANG Sheming,ZHANG Qifu,SUN Shiqing,TENG Huaxiang,LI Xuetao. Effect of Stamping Temperature on Cracks in Coating of Galvanized 22MnB5 Steel Plates[J]. Corrosion & Protection, 2018, 39(4): 302
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【5】GUI Z X,LIANG W K,LIU Y,et al. Thermo-mechanical behavior of the Al-Si alloy coated hot stamping boron steel[J]. Materials and Design,2014,60:26-33.
【6】张杰,江社明,张启富. 热成形钢镀层研究进展[J]. 金属热处理,2015,40(3):169-172.
【7】GUI Z X,LIANG W K,ZHANG Y S. Formability of aluminum-silicon coated boron steel in hot stamping process[J]. Transactions of Nonferrous Metals Society of China,2014,24:1750-1757.
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【11】林建平,立影,孙国华,等. 超高强度钢板热冲压成形研究与进展[J]. 金属铸锻技术,2008,37(21):140-144.
【12】张杰,江社明,张启富,等. 加热工艺对22MnB5钢板组织和力学性能的影响[J]. 热加工工艺,2014,43(14):204-206.
【13】ZHU L J,GU Z W,XU H,et al. Modeling of microstructure evolution in 22MnB5 steel during hot stamping[J]. Journal of Iron and Steel Research,2014,21(2):197-201.
【14】NEDERI M,KETABCHI M,ABBASI M,et al. Analysis of microstructure and mechanical properties of different boron and non-boron alloyed steels after being hot stamped[J]. Procedia Engineering 2011,10:460-465.
【15】TURETTA A,BRUSCHI S,GHIOTTI A. Investigation of 22MnB5 formability in hot stamping operations[J]. Journal of Materials Processing Technology,2006,177:396-400.
【16】谷诤巍,孟佳,李欣,等. 超高强度钢热成形奥氏体化加热参数的优化[J]. 吉林大学学报:工学版,2011(S2):194-197.
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