Ferrite formation and decomposition in 316H austenitic stainless steel electro slag remelting ingot for nuclear power applications

doi:10.1016/j.matchar.2024.114581

IMR OpenIR

	Ferrite formation and decomposition in 316H austenitic stainless steel electro slag remelting ingot for nuclear power applications
	Wang, Yang 1; Chen, Chao 1; Ren, Ruijie 1,2; Xue, Zhixuan 1; Wang, Haozheng 1; Zhang, Yunzhe 1; Wang, Junxian 1; Wang, Jian 1; Chen, Lei 3; Mu, Wangzhong 4,5
通讯作者	Chen, Chao(chenchao@tyut.edu.cn)
	2024-12-01
发表期刊	MATERIALS CHARACTERIZATION
ISSN	1044-5803
卷号	218 页码:11
摘要	316H austenitic stainless steel used in nuclear power has higher requirements for material magnetism, and the main magnetic phase is ferrite. Thus, the ferrite content in 316H steel castings needs to be strictly controlled. This study investigated the ferrite phases in 316H austenitic stainless steel electro-slag remelting (ESR) ingot used in nuclear power applications. The morphology, content and decomposition of ferrite as well as microsegregation in 316H ESR ingot are studied by optical microscopy (OM), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD) and electron probe microanalysis (EPMA). The solidification process is calculated by thermodynamic calculation using Thermo-Calc. Besides, the empirical chromium and nickel equivalent formulas and phase stability diagram are used for prediction of the solidification mode and ferrite content. The experiment results show that the ferrite morphology changes greatly in the direction of the thickness of ESR ingot. From surface to center of the ESR ingot, the ferrite morphology varies as granular -* short rod-shaped -* blocky -* skeletal -* parallel short rod-like + network-like. The ferrite content in the thickness direction of the electroslag ingot varied from 1.92 to 3.57 %, showing an "A" shape distribution. There are three kinds of decomposition behavior of ferrite: decomposition into Sigma phase and austenite phase by the eutectoid reaction, transformation into Chi phase in regions enriched with high Mo element along grain boundaries, and direct transformation into secondary austenite phase. In addition, the thermodynamic calculation and most of empirical formulas predicts the solidification mode is FA mode. From the microstructure analysis, the solidification mode of ESR ingots change from AF mode to FA mode from surface to center. Furthermore, the formulas proposed by Hull provides most accurate predictions results in ferrite content.
关键词	Ferrite 316H austenitic stainless steel Solidification mode Electro-slag remelting ingot Sigma phase
资助者	Shanxi Scholarship Council of China ; Ministry of Education of China ; National Natural Science Foundation of China ; Applied Fundamental Research Programs of Shanxi Province
DOI	10.1016/j.matchar.2024.114581
收录类别	SCI
语种	英语
资助项目	Shanxi Scholarship Council of China[2022-040] ; Ministry of Education of China[HZKY20220507] ; National Natural Science Foundation of China[52104338] ; Applied Fundamental Research Programs of Shanxi Province[202303021221036]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Materials Science, Characterization & Testing
WOS记录号	WOS:001365262900001
出版者	ELSEVIER SCIENCE INC
引用统计	被引频次：5[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/181580
专题	中国科学院金属研究所
通讯作者	Chen, Chao
作者单位	1.Taiyuan Univ Technol, Coll Mat Sci & Engn, Taiyuan 030024, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 3.Taiyuan Univ Technol, Coll Mech Engn, Taiyuan 030024, Peoples R China 4.KTH Royal Inst Technol, Dept Mat Sci & Engn, SE-10044 Stockholm, Sweden 5.Northeastern Univ, Key Lab Electromagnet Proc Mat, Minist Educ, Shenyang 110819, Peoples R China
推荐引用方式 GB/T 7714	Wang, Yang,Chen, Chao,Ren, Ruijie,et al. Ferrite formation and decomposition in 316H austenitic stainless steel electro slag remelting ingot for nuclear power applications[J]. MATERIALS CHARACTERIZATION,2024,218:11.
APA	Wang, Yang.,Chen, Chao.,Ren, Ruijie.,Xue, Zhixuan.,Wang, Haozheng.,...&Mu, Wangzhong.(2024).Ferrite formation and decomposition in 316H austenitic stainless steel electro slag remelting ingot for nuclear power applications.MATERIALS CHARACTERIZATION,218,11.
MLA	Wang, Yang,et al."Ferrite formation and decomposition in 316H austenitic stainless steel electro slag remelting ingot for nuclear power applications".MATERIALS CHARACTERIZATION 218(2024):11.