杨幸,熊毅,查小琴,厉勇,任凤章

• 1:河南科技大学材料科学与工程学院
• 2:有色金属新材料与先进加工技术省部共建协同创新中心
• 3:洛阳船舶材料研究院
• 4:海洋腐蚀与保护全国重点实验室

摘要(Abstract)：

采用X射线衍射、光学显微镜、扫描电镜、透射电镜、显微硬度计和万能拉伸试验机等研究了时效温度(400～600℃)对冷轧态Fe-28Mn-8Al-1C轻质钢(变形量为90%)微观组织及力学性能的影响。结果表明：该冷轧态轻质钢经不同温度时效处理后，均能析出纳米尺度的κ-碳化物((Fe, Mn)_3AlC),而当时效温度升高至450℃后开始析出B2相；随着时效温度的升高，纳米级第二相的尺寸逐渐增大，冷变形奥氏体的基体组织在550℃开始发生再结晶现象；冷轧态轻质钢的力学性能随时效温度的升高呈现先增加后降低的变化趋势，经450℃时效处理后，在时效强化的主要作用下，其硬度、抗拉强度和屈服强度分别为621 HV0.5、1956 MPa和1905 MPa,与时效前相比，分别增加了17%、15%和16%。冷轧态轻质钢的断口形貌随时效温度的升高由韧-脆混合的断口形貌转变为韧性断裂断口形貌。

关键词(KeyWords)： 轻质钢;时效强化;微观组织;力学性能

Abstract:

Keywords:

基金项目(Foundation): “十四五”国家重点研发计划(2022YFB3705200);; 国家自然科学基金(U1804146,51905153,52111530068);; 河南省重大专项资助项目(221100230200)

作者(Author): 杨幸,熊毅,查小琴,厉勇,任凤章

DOI: 10.13289/j.issn.1009-6264.2024-0517

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