杨跃辉

• 1:唐山学院机电工程系

摘要(Abstract)：

对普通Q235钢进行55%的冷变形,然后加热至750℃并保温不同时间,水冷后获得了平均晶粒尺寸在5~8μm,且具有双峰尺度分布的铁素体组织,讨论了此类组织的形成过程及其对性能的影响。结果表明:试验钢的屈服强度和抗拉强度分别达到825 MPa和970 MPa,此时仍具有11.4%的均匀伸长率。分析认为临界区保温期间同时存在变形铁素体的再结晶以及奥氏体晶粒的形核长大,再结晶得到多边形铁素体,且其随保温时间的延长快速长大,粗大的多边形铁素体限制了奥氏体晶粒的合并长大,因此冷却后生成的准多边形铁素体更加细小,促进了双峰尺度分布的形成。试验钢应力应变曲线表现为连续屈服,证明细小的准多边形铁素体可以起到与双相钢中硬相相同的作用。

关键词(KeyWords)： 低碳钢Q235;双峰尺度;力学性能

Abstract:

Keywords:

基金项目(Foundation): 河北省高等学校科学研究项目(ZC2016022);; 河北省钢铁联合研究基金项目(E2014105091);; 河北省科技计划资助项目(14211014D)

作者(Author): 杨跃辉

DOI: 10.13289/j.issn.1009-6264.2016.12.017

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