Precipitation behavior of the sigma phase with Ni and Mn content variations in superaustenitic stainless steel weld metal
- Title
- Precipitation behavior of the sigma phase with Ni and Mn content variations in superaustenitic stainless steel weld metal
- Author
- 이창희
- Keywords
- Superaustenitic stainless steel; Sigma phase; Ni; Mn; Depletion zone
- Issue Date
- 2018-10
- Publisher
- ELSEVIER SCIENCE INC
- Citation
- MATERIALS CHARACTERIZATION, v. 144, page. 148-154
- Abstract
- In this study, precipitation behavior of the sigma phase with variations of the Ni and Mn in superaustenitic stainless steel weld metal was evaluated focused on microstructure and thermodynamic analysis. Experiments were conducted with variation of Ni and Mn based on a 23Cr-17Ni-6Mo superaustenitic stainless steel weld. And GTAW welding was performed on the casted specimens for simulating the weld metal. The weld metal consisted of gamma-dendrite and an amount of sigma phases at interdendritic boundaries. And the sigma phase fraction showed decreasing behavior inversely according to addition of the Ni and Mn in the weld metal. From the micro structural analysis, the Ni addition induced increase of Mo content in the sigma phase, which caused the Mo depletion zone around the sigma phase. Whereas, the Mn addition induced replacement of Mo in sigma phase by Mn, so that the Mo depletion zone was not formed. Also, from the Thermo-Calc analysis, it was revealed that Ni addition caused increase of Mo activity, which induced Mo clustering in the sigma phase, while the Mn addition showed opposite effect of the Mo activity.
- URI
- https://www.sciencedirect.com/science/article/pii/S1044580317335416?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/120178
- ISSN
- 1044-5803; 1873-4189
- DOI
- 10.1016/j.matchar.2018.07.006
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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