| 大气环境下1180MPa级超高强钢延迟开裂寿命研究 |
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| 引用本文： | 万荣春,付立铭,王学双. 大气环境下1180MPa级超高强钢延迟开裂寿命研究[J]. 锻压技术, 2021, 46(1): 164-169 |
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| 作者姓名： | 万荣春 付立铭 王学双 |
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| 作者单位： | 渤海船舶职业学院 材料工程系,辽宁 葫芦岛125105;上海交通大学 材料科学与工程学院,上海200240;上海交通大学 材料科学与工程学院,上海200240;中国第一汽车集团公司,吉林 长春130011 |
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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。 |
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| 摘 要： | 通过对试验钢进行拉深成形模拟超高强钢实际应用时的应力、应变状态,研究了盐雾和大气环境下DP1180钢、MS1180钢和QP1180钢这3种1180 MPa级超高强汽车薄板钢拉深冲杯试样的延迟开裂寿命.试验结果表明:在盐雾条件下,DP1180钢的抗延迟开裂性能最好,QP1180钢的抗延迟开裂性能最差;但大气环境下,DP1...
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| 关 键 词： | 盐雾 大气环境 超高强钢 延迟开裂 拉应力 拉应变 |
Research on delayed cracking life for 1180MPa ultra-high strength steel in atmospheric environment |
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| Wan Rongchun,Fu Liming,Wang Xueshuang. Research on delayed cracking life for 1180MPa ultra-high strength steel in atmospheric environment[J]. Forging & Stamping Technology, 2021, 46(1): 164-169 |
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| Authors: | Wan Rongchun Fu Liming Wang Xueshuang |
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| Affiliation: | (Materials Engineering Department,Bohai Shipbuilding Vocational College,Huludao 125105,China;School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;China FAW Group Corporation,Changchun 130011,China) |
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| 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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| Keywords: | salt spray atmospheric environment ultra-high strength steel delayed cracking tensile stress tensile strain |
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