牛佳佳,孙磊,霍光瑞,杨常举,高珍鹏

• 1:洛阳船舶材料研究所
• 2:海洋腐蚀与防护全国重点实验室

摘要(Abstract)：

探索Fe-Mn-Al-C系低密度钢的低温性能和变形行为对扩展其在低温领域的应用具有重要意义。采用扫描电镜、透射电镜和万能拉伸试验机等研究了时效处理对Fe-30Mn-9Al-0.9C低密度高锰钢组织性能的影响。结果表明：试验钢的晶粒取向均呈随机分布，经-196℃拉伸变形后，绝大部分晶粒取向倾向于<001>//拉伸方向或<111>//拉伸方向；经600或650℃时效12 h后，试验钢在室温和-196℃拉伸时均呈脆性断裂，甚至在弹性变形阶段就发生脆断；经550℃时效0.5 h后，试验钢在-196℃下的屈服强度、抗拉强度和断后伸长率分别为1591 MPa、1784 MPa和31.4%;试验钢经550℃时效处理的反快速傅里叶变换(IFFT)和选区电子衍射花样中存在较强超点阵衍射，表明存在短程有序的κ-碳化物，使其在低温条件下的塑性变形机制依然以平面滑移为主。

关键词(KeyWords)： Fe-Mn-Al-C低密度高锰钢;低温变形;有序相;平面滑移

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 牛佳佳,孙磊,霍光瑞,杨常举,高珍鹏

DOI: 10.13289/j.issn.1009-6264.2024-0576

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