Transactions of Materials and Heat Treatment

Title：Research on delayed cracking life for 1180 MPa ultra-high strength steel in atmospheric environment

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ClassificationCode：TG111.91

year,vol(issue):pagenumber：2021,46(1):164-169

Abstract：

The stress and strain state of ultra-high strength steel in practical application were simulated by deep-drawing with test steel, and the delayed cracking lifes for three kinds of ultra-high strength automotive sheet steels such as DP1180 steel, MS1180 steel and QP1180 steel in salt spray and atmospheric environments were studied respectively. The results show that in the salt spray condition, DP1180 steel has the best anti-delayed cracking performance, and QP1180 steel has the worst. However, in the atmospheric environment, DP1180 steel has the best anti-delayed cracking performance, and MS1180 steel has the worst, which is most prone to delayed cracking. Furthermore, in the atmospheric environment, ultra-high strength steel is easy to delay cracking under the combined action of tensile stress/tensile strain and environmental hydrogen, and for the first time, the cracking of deep-drawing cup sample cracking is found at the edge of outer surface in the cup bottom with the maximum tensile stress and the maximum tensile strain. In addition, the existence of island martensite and massive ferrite in the test steel is beneficial to reduce its delayed cracking sensitivity.

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基金项目:2018年辽宁省自然科学基金指导计划项目（20180550659）；2019年辽宁省教育厅科学研究经费项目（BHCYL201901）；2019年辽宁省“百千万人才工程”人选科技活动资助项目

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

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