吝章国,唐荻,郑红红,米振莉,江海涛

• 1:北京科技大学冶金工程研究院
• 2:北京神州卓越石油科技有限公司

摘要(Abstract)：

采用连续退火模拟机CCT-AY-Ⅱ对中锰Q&P钢(0.2C-5Mn-1.5Si中锰钢,锰含量4.92%)进行热处理实验,利用SEM、EBSD、拉伸试验以及X射线衍射法研究了不同退火温度对中锰Q&P钢的组织和力学性能、残留奥氏体含量的影响。结果表明,随退火温度的升高,抗拉强度逐渐升高,屈服强度逐渐降低,伸长率和强塑积先升高后降低,在660℃奥氏体化Q&P处理后力学性能最佳,抗拉强度为1040 MPa,断后伸长率为33.7%,强塑积达35.9 GPa·%;残留奥氏体体积分数随着退火温度的升高逐渐增多,最高达25%;试验钢对两相区奥氏体化温度非常敏感,稍高或稍低的退火温度都会导致强塑积的急剧下降,而在650~670℃之间退火时强塑积可达30.0 GPa·%以上。

关键词(KeyWords)： 中锰钢;Q&P工艺;两相区退火;亚稳奥氏体;应力应变

Abstract:

Keywords:

基金项目(Foundation): 高等学校博士学科点专项科研基金(20110006110007);; 中央高校基本科研业务费资助项目(FRF-TP-11-005B)

作者(Author): 吝章国,唐荻,郑红红,米振莉,江海涛

DOI: 10.13289/j.issn.1009-6264.2015.07.008

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