锻压技术

1180 MPa级超高强钢慢速率拉伸延迟开裂性能

英文标题：Delayed fracture performance of 1180 MPa ultra high-strength steel by slow strain rate tension

作者：万荣春付立铭王学双

关键词：超高强钢延迟断裂慢应变速率拉伸试验 DP1180钢 QP1180钢微观组织

分类号：TG111.91

出版年,卷(期):页码：2019,44(3):140-143

摘要：

针对DP1180和QP1180两种超高强度汽车用钢板，通过微观组织分析和慢应变速率拉伸试验（SSRT）研究了这两种1180 MPa级超高强汽车钢的延迟开裂性能。试验结果表明，DP1180钢的微观组织为马氏体+铁素体，QP1180钢的微观组织为马氏体+铁素体+少量残余奥氏体。试验钢的延迟开裂性能用其在0.1 mol·L-1的HCl介质中与空气介质中的力学性能指标的比值表示。QP1180钢断裂时间、断面收缩率、断后伸长率、抗拉强度的比值均低于DP1180钢，说明0.1 mol·L-1的HCl 介质对QP1180钢力学性能指标影响更大些，其延迟开裂的敏感性更高。

For ultra-high strength automotive steel DP1180 and QP1180 sheets, their delayed fracture properties were studied by microstructural analysis and slow strain rate tension test (SSRT). The results show that the microstructures of DP1180 steel are martensite and ferrite, and the microstructures of QP1180 steel are martensite，ferrite and a small amount of retained austenite. The delayed fracture behavior of test steel is expressed by the ratio of mechanical properties in 0.1 mol·L-1 HCl medium to air medium. The fracture time, section shrinkage, elongation after fracture and the tensile strength ratio of QP1180 steel are lower than that of DP1180 steel, which shows that 0.1 mol·L-1 HCl medium has more influence on the mechanical properties of QP1180 steel, and its sensitivity to delayed cracking is higher.

基金项目：

2018年辽宁省自然科学基金指导计划项目（20180550659）；2015年辽宁省教育厅科学技术研究一般项目（L2015004）

万荣春（1981-），男，博士，副教授，E-mail：springs111@163.com

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