吴腾,吴润,邓雨微,刘斌,梁文

• 1:武汉科技大学省部共建耐火材料与冶金国家重点实验室
• 2:武汉科技大学信息科学与工程学院
• 3:宝钢中央研究院武汉分院

摘要(Abstract)：

基于合金减量化原则,采用以超快冷技术为核心的新一代TMCP技术制备了1200 MPa级热轧双相钢,研究了弛豫时间对试验钢组织和性能的影响。研究表明:随着弛豫时间增加,试验钢铁素体晶粒尺寸和体积分数均增加,屈服强度降低,伸长率均在10.0%以上;组织中马氏体均以块状马氏体为主,并由块状向小岛状转变,其体积分数减少,抗拉强度降低,屈强比减小,n值增加。弛豫时间影响到铁素体和马氏体的体积分数及内部结构。弛豫9 s的试验钢,铁素体体积分数为44.2%,铁素体晶粒尺寸为3.4μm,组织中块状马氏体中板条束条宽细化至0.3μm及较多的小岛状马氏体有利于n值,抗拉强度达到1258 MPa,伸长率为12.0%,屈强比最低为0.55,n值高达0.13,其综合性能最好。

关键词(KeyWords)： 超高强双相钢;弛豫时间;显微组织;成型性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51771139);; 省部共建耐火材料与冶金国家重点实验室青年基金(2018QN07)

作者(Author): 吴腾,吴润,邓雨微,刘斌,梁文

DOI: 10.13289/j.issn.1009-6264.2019-0043

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