Nb和Cr对冷轧低碳低硅双相钢组织性能的影响Effect of Nb and Cr on microstructure and properties of low C and low Si cold-rolled high strength dual-phase steels
张学辉,李永强,庞海轮,朱国辉,毛卫民,张先贵
摘要(Abstract):
研究了在不同双相处理工艺条件下加Nb(0.033%)和加Cr(0.44%)两种低碳低硅冷轧双相钢的组织演变规律和性能特点。分析了合金元素Cr和Nb对双相组织中马氏体体积分数、马氏体形态和铁素体晶粒尺寸的影响。结果表明,Nb的作用主要是通过NbC粒子的析出阻碍再结晶晶粒的长大,从而在同样较低温度热处理工艺条件下,加Nb双相钢中的铁素体晶粒较细。随着处理温度的升高,当相变先于再结晶发生时,NbC对细化晶粒的作用不明显,因而加Nb和加Cr钢具有相近的铁素体晶粒尺寸。Cr提高奥氏体形成温度,导致双相处理时奥氏体的体积分数以及淬火后马氏体的体积分数的减少。力学性能分析表明,在同样的双相处理条件下,加Nb钢具有较高的强度和较低的屈强比;而加Cr钢则表现出较好的塑性。
关键词(KeyWords): 高强度双相钢;合金元素;晶粒细化;组织性能
基金项目(Foundation):
作者(Author): 张学辉,李永强,庞海轮,朱国辉,毛卫民,张先贵
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