核级316NG奥氏体不锈钢在热老化条件下的析出相

doi:10.13251/j.issn.0254-6051.2023.11.008

金属热处理 ›› 2023, Vol. 48 ›› Issue (11): 50-54.DOI: 10.13251/j.issn.0254-6051.2023.11.008

核级316NG奥氏体不锈钢在热老化条件下的析出相

隋凯伦, 欧阳瑾霏, 巩明浩, 胡洪兴, 李家丰, 阳姗, 龙朝辉, 李小波

湘潭大学材料科学与工程学院, 湖南湘潭 411105

收稿日期:2023-05-22 修回日期:2023-09-06 出版日期:2023-11-25 发布日期:2023-12-27
通讯作者: 龙朝辉,副教授,博士,E-mail:zhlong@xtu.edu.cn
作者简介:隋凯伦(2001—),男,学士,主要研究方向为奥氏体不锈钢,E-mail:2633740649@qq.com。
基金资助:
广东省电子功能材料与器件重点实验室开放基金(EFMD2021007M)

Precipitates of nuclear grade 316NG austenitic stainless steel under thermal aging

Sui Kailun, Ouyang Jinfei, Gong Minghao, Hu Hongxing, Li Jiafeng, Yang Shan, Long Zhaohui, Li Xiaobo

School of Materials Science and Engineering, Xiangtan University, Xiangtan Hunan 411105, China

Received:2023-05-22 Revised:2023-09-06 Online:2023-11-25 Published:2023-12-27

摘要/Abstract

摘要： 通过热老化模拟试验、电解萃取试验和热力学计算方法(CALPHAD)研究了核级316NG奥氏体不锈钢在核环境下的析出相情况。结果表明,316NG奥氏体不锈钢在450 ℃老化100 h无析出相;老化500 h的主要析出相为Cr₂₃C₆;老化1000 h的主要析出相为Z-CrNbN、Cr₂₃C₆和Laves_C14。然后,采用CALPHAD方法建立了316NG奥氏体不锈钢的热力学数据库,并以此数据库为基础,利用Thermo-Calc软件计算了316NG奥氏体不锈钢在450 ℃平衡状态下的析出相组成为Cr₂₃C₆、Z-CrNbN、Laves_C14、Ni₃Si和MX,析出相总原子分数为3.5%,其中Ni₃Si和MX的含量很低(0.46%)。通过CALPHAD方法计算得到的析出相组成与450 ℃等温退火1000 h后的热老化试验结果符合得较好,从而获得关于316NG奥氏体不锈钢在长时间热老化条件下的析出相规律及组织成分的较为完善的信息。

关键词: 316NG奥氏体不锈钢, 热老化, 析出相, CALPHAD

Abstract: Precipitation conditions of the 316NG austenitic stainless steel in the nuclear environment were studied by means of thermal aging simulation experiment, electrolytic extraction experiment and the CALPHAD method. Then, the thermodynamic database of the 316NG austenitic stainless steel was established by the CALPHAD method. The results show that the 316NG austenitic stainless steel has no precipitated phase during annealing at 450 ℃ for 100 h, the Cr₂₃C₆ is the main precipitated phase when annealed at 450 ℃ for 500 h, and the main precipitated phases are Z-CrNbN, Cr₂₃C₆ and Laves_C14 when annealed at 450 ℃ for 1000 h. Based on the thermodynamic database, at 450 ℃, the equilibrium precipitated phases calculated by the Thermo-Calc software are Cr₂₃C₆, Z-CrNbN, Laves_C14, Ni₃Si and MX, and the total atom fraction is 3.5%, among which the content of Ni₃Si and MX is only 0.46%. The calculated precipitated phases by CALPHAD are good agreement with the results by thermal aging experiment of annealing at 450 ℃ for 1000 h, showing that the more complete information is obtained on the precipitated phases and their compositions of the 316NG austenitic stainless steel under long-term thermal aging.

Key words: 316NG austenitic stainless steel, thermal aging, precipitates, CALPHAD

中图分类号:

TG161

隋凯伦, 欧阳瑾霏, 巩明浩, 胡洪兴, 李家丰, 阳姗, 龙朝辉, 李小波. 核级316NG奥氏体不锈钢在热老化条件下的析出相[J]. 金属热处理, 2023, 48(11): 50-54.

Sui Kailun, Ouyang Jinfei, Gong Minghao, Hu Hongxing, Li Jiafeng, Yang Shan, Long Zhaohui, Li Xiaobo. Precipitates of nuclear grade 316NG austenitic stainless steel under thermal aging[J]. Heat Treatment of Metals, 2023, 48(11): 50-54.

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核级316NG奥氏体不锈钢在热老化条件下的析出相

Precipitates of nuclear grade 316NG austenitic stainless steel under thermal aging

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