中锰钢温成形技术探讨  

Warm stamping of medium-Mn steel

作　　者：李书利[1] 王存宇[2,3] 王育田 常颖[4] 董瀚[2] 

机构地区：[1]长城汽车股份有限公司技术中心,河北保定071000 [2]钢铁研究总院华东分院,北京100081 [3]太原钢铁(集团)有限公司技术中心,山西太原030003 [4]大连理工大学汽车工程学院,辽宁大连116024

出　　处：《钢铁研究学报》2016年第11期46-50,共5页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(51571048);国家"973"计划资助项目(2010CB630803)

摘　　要：使用Gleeble-3800热模拟试验机研究了中锰钢(温成形钢)和22MnB5钢(热成形钢)的微观组织、力学性能和高温拉伸性能。结果表明:与22MnB5钢相比,在获得1 500MPa级的抗拉强度时,中锰钢的加热温度可从950℃降低到800℃,钢的组织明显细化并且没有发生表面脱碳,断后伸长率从7.5%提高到10%。高温拉伸试验结果表明:中锰钢比22MnB5钢具有更高的延伸率和硬化指数,可以减小成形过程中局部减薄过高导致的样件破裂。The microstructure,mechanical properties and high temperature tensile properties of medium-Mn steel（warm stamping steel）and 22MnB5steel（hot stamping steel）were studied by Gleeble-3800 hot simulation tester.The results show that comparing with 22MnB5 steel,the heating temperature of medium-Mn steel reduces from950℃to 800℃for obtaining the tensile strength of 1 500 MPa,and finer microstructure can be obtained in medium-Mn steel without surface decarburization;the total elongation reaches 10% which is higher than that of hot stamping steel（7.5%）.The high temperature tensile tests results show that the medium-Mn steel has higher elongation and hardening index value,which can reduce the broken induced by local necking during high temperature stamping process.

关 键 词：第三代汽车钢 中锰钢 温成形 热成形 马氏体 

分 类 号：TG142.1[一般工业技术—材料科学与工程]