Transactions of Materials and Heat Treatment

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

Authors： Wan Rongchun Fu Liming Wang Xueshuang

Unit： Bohai Shipbuilding Vocational College Shanghai Jiao Tong University China FAW Group Co. Ltd.

KeyWords： ultra high-strength steel delayed fracture slow strain rate tension test DP1180 steel QP1180 steel microstructure

ClassificationCode：TG111.91

year,vol(issue):pagenumber：2019,44(3):140-143

Abstract：

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.

Funds：

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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