17-4PH不锈钢350℃长期时效组织演化的透射电镜观察

邹红; 王均; 李聪; 左汝林; 邱绍宇; 沈保罗

17-4PH不锈钢350℃长期时效组织演化的透射电镜观察

1. 中国核动力研究设计院核燃料及材料国家重点实验室, 成都, 610041;
2. 四川大学材料科学与工程学院, 成都, 610064;
3. 重庆大学材料学院, 400044

基金项目:

核燃料及材料国家重点实验室基金资助(51481080104ZS8501)

详细信息

作者简介:
邹红(1968—),女,副研究员。2001年毕业于中国核动力研究设计院核材料及循环专业,获博士学位。现从事反应堆结构材料的研究。

王均(1976—),男,博士研究生。2004年毕业于四川大学金属材料专业,获硕士学位。主要从事金属材料的研究。

李聪(1968—),男,副研究员。2003年毕业于四川大学材料专业,获博士学位。现从事材料结构与性能的研究。

中图分类号: TL7
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出版历程
- 收稿日期: 2005-01-25
- 网络出版日期: 2025-07-29
- 刊出日期: 2005-08-15

Study on Microstructure Transformation of 17-4PH Stainless Steel after Long-Term Aging at 350℃

1. National Key Laboratory of Nuclear Fuel and Materials, Nuclear Power Institute of China, Chengdu, 610041, China;
2. School of Materials Science and Engineering, Sichuan University, Chengdu, 610064, China;
3. School of Materials Science and Engineering, Chongqi University, 400044, China

摘要

摘要: 采用X-ray衍射(XRD)和透射电镜(TEM)研究了17-4PH马氏体沉淀硬化不锈钢在350℃长期时效过程中显微组织的变化规律。结果表明:在沉淀硬化回火处理后,在典型的板条马氏体基体中弥散分布着大量的纳米级的ε-Cu颗粒,二次碳化物M₂₃C₆沿马氏体板条束界析出。17-4PH马氏体不锈钢在350℃时效6个月后,组织发生一定变化,spinodal分解开始在晶界发生,另外析出的ε-Cu颗粒逐渐长大,并且有少量的逆转变奥氏体产生。17-4PH不锈钢在350℃时效15个月后,spinodal分解逐渐由晶界发生转向晶内,基体中析出大量有取向的细小的G相,并观测到少量sigma相。基体仍为板条马氏体。
- 17-4PH不锈钢 /
- 等温时效 /
- 组织演化 /
- spinodal分解 /
- G相
Abstract: The transformation of microstructure with the extension of aging time on the type of 17-4PHstainless steel at 350℃ was studied in this paper by X-ray diffraction and transmission electron microscope. The results showed that there was the matrix of lath martensite and the nano-metric precipitates of ε-Cu and secondary carbide, M₂₃C₆, after the type alloy subjected to solution treatment and temper treatment. When the alloy aged at 350℃ for about 4200 h, the α-α’ spinodal decomposition occurred along the grain boundary and some reversed austenite was transformed. With the age time extended to 11000 h, the spinodal decomposition and G-phase, which consisted of complex nickel silicide, precipitation occurred in matrix at this intermediate temperature. Some sigma phase was also observed.
- 17-4PH stainless steel /
- Isothermal aging /
- Microstructure transformation /
- Spinodal de- composition /
- G phase