胡进朋,万德成,李杰,安庆生

• 1:华北理工大学冶金与能源学院

摘要(Abstract)：

利用扫描电镜(SEM)、X射线衍射(XRD)和拉伸试验机研究了临界区不同退火温度对Fe-0.21C-4.1Mn-1.85Si-0.05Nb冷轧中锰钢组织性能和变形行为的影响。结果表明:随着退火温度的升高,试验钢中铁素体含量逐渐降低,马氏体含量增加且尺寸增大,残留奥氏体的含量先升高后降低;随着退火温度的升高,试验钢的抗拉强度逐渐升高,屈服强度先升高后降低,伸长率先升高后降低,强塑积先升高后逐渐降低最后再次升高。残留奥氏体的稳定性降低和铁素体的硬化行为阻碍了吕德斯带的拓展。PLC(Portevin-Le Chatelier)效应受残留奥氏体含量和稳定性的影响。680℃及以下退火,由于多相组织协调变形以及较高稳定性残留奥氏体产生明显的TRIP(Transformation induced plasticity,相变诱导塑性)效应,使得试验钢变形时获得更持久的加工硬化能力。退火温度为680℃时,试验钢的力学性能最佳,抗拉强度为1059 MPa,伸长率为22.2%,强塑积为23.5 GPa·%。680℃以上退火,硬相马氏体增多,同时残留奥氏体的稳定性降低,易于转变为马氏体,试验钢的总体加工硬化率更高,抗拉强度增加,但塑性下降。

关键词(KeyWords)： 中锰钢;退火温度;残留奥氏体;变形行为

Abstract:

Keywords:

基金项目(Foundation): 河北省科技重大专项项目(21281008Z);; 唐山市应用基础研究项目(21130218C)

作者(Author): 胡进朋,万德成,李杰,安庆生

DOI: 10.13289/j.issn.1009-6264.2021-0370

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