赵紫杨,孙永庆,罗茜尹,苏礼奎,赵志国,范云鹰

• 1:昆明理工大学材料科学与工程学院
• 2:钢铁研究总院特殊钢研究院
• 3:中国航空工业集团公司成都飞机设计研究所

摘要(Abstract)：

采用透射电镜(TEM)、X射线衍射(XRD)、电子背散射衍射(EBSD)技术以及拉伸实验机等对冷变形PH13-8Mo不锈钢经510～621℃时效处理后的微观组织和力学性能进行了研究，并分析了其强化机制。结果表明：时效处理后PH13-8Mo不锈钢的析出相为NiAl、M_(23)C_6、M_2C及碳化物和NiAl的复合相。NiAl是主要强化相，以球状弥散分布在基体上，随时效温度的升高，其尺寸逐渐增大，体积分数先增加后减少；M_(23)C_6主要以链状形式分布在晶界和板条界处，其形貌随时效温度的升高，由椭圆状变为短棒状最终转变为块状；M_2C主要分布在晶内，566℃时效后逐渐消失。PH13-8Mo不锈钢经冷拉时效处理后，其力学性能显著提升，其中510℃时效处理后强度达到最高值，随着时效温度的升高，强度和硬度呈持续下降趋势。通过理论计算分析得知，510℃时效时，PH13-8Mo不锈钢的强化机制主要是位错强化，538～566℃时效时主要是析出强化，621℃时效则主要是固溶强化。

关键词(KeyWords)： 时效处理;析出相;逆转变奥氏体;强化机制

Abstract:

Keywords:

基金项目(Foundation): 航空工业成都飞机设计研究所预研项目

作者(Author): 赵紫杨,孙永庆,罗茜尹,苏礼奎,赵志国,范云鹰

DOI: 10.13289/j.issn.1009-6264.2024-0041

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