赵征志,佟婷婷,闫远,梁驹华,赵爱民,覃强

• 1:北京科技大学冶金工程研究院
• 2:北京市交通与能源用特殊钢工程技术研究中心
• 3:中钢设备有限公司

摘要(Abstract)：

针对一种0.14C-2.72Mn-1.29Si冷轧高强钢进行了轧制和不同等温时效温度的退火处理,得到了两种不同退火基体的组织特征,均具有较好的综合力学性能。利用FESEM、XRD、TEM和拉伸试验对比分析了不同退火基体试验钢的微观组织、力学性能和加工硬化行为。研究表明:试验钢在220~300℃等温时效后钢板的基体组织主要由铁素体和马氏体构成,240℃等温时效后钢板的综合性能最佳,屈服强度为672 MPa,抗拉强度为1333 MPa,总伸长率为13%,屈强比为0.50,组织中含有5.75%的残留奥氏体。而试验钢在390~430℃等温时效后钢板的基体组织主要由铁素体和贝氏体构成,在390℃等温时效后钢板的综合性能最佳,屈服强度为505 MPa,抗拉强度为1115 MPa,总伸长率为17%,屈强比为0.45,组织中含有11.17%的残留奥氏体。铁素体+马氏体基体退火钢优异的综合力学性能主要源于细晶强韧化;而铁素体+贝氏体基体退火钢优异的性能主要源于细晶强韧化和TRIP效应增塑,这两种机制的共同作用,使得钢板在高强度的同时,还具有较好的塑韧性。

关键词(KeyWords)： 高强钢;不同退火基体;细晶;残留奥氏体;加工硬化

Abstract:

Keywords:

基金项目(Foundation): 中央高校基本科研业务费专项资金(FRF-TP-10-001A)

作者(Author): 赵征志,佟婷婷,闫远,梁驹华,赵爱民,覃强

DOI: 10.13289/j.issn.1009-6264.2015.05.016

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