马啸宇,黄贞益,马玉康,侯清宇,郭爱民,光剑锋

• 1:安徽工业大学冶金工程学院

摘要(Abstract)：

通过X射线衍射(XRD)、透射电镜(TEM)、电子背散射衍射(EBSD)以及拉伸实验等研究了时效温度对铸态奥氏体基低密度钢(Mn30Al9Si)组织及力学性能的影响,并研究了其强韧化机制。结果表明:铸态Mn30Al9Si钢经固溶时效后的组织由奥氏体基体及条状铁素体组成,并包含κ-碳化物、β-Mn等第二相;450℃时效后试验钢获得了优异的强塑性结合,其抗拉强度为732 MPa,伸长率为52.91%;500℃时效后,由于β-Mn相在铁素体/奥氏体边界析出,其伸长率由52.91%下降到6.31%;550℃时效过程中,由于β-Mn相持续析出并长大以及κ-碳化物的不断长大并分布在奥氏体晶界,使伸长率下降至0.67%。Mn30Al9Si钢的变形区TEM组织具有典型的平面滑移特征,奥氏体基体中存在大量畴界及交叉微带,赋予了试验钢优秀的强塑性,其强韧化机制以微带诱发塑性为主。

关键词(KeyWords)： 奥氏体基低密度钢;时效温度;组织结构;位错滑移

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51674004)

作者(Author): 马啸宇,黄贞益,马玉康,侯清宇,郭爱民,光剑锋

DOI: 10.13289/j.issn.1009-6264.2020-0255

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