Precipitation behavior of the sigma phase with Ni and Mn content variations in superaustenitic stainless steel weld metal

被引：34
作者：
Lee, Changmin [1 ]
Lee, Youngchai [1 ]
Lee, Changhee [1 ]
Hong, Seunggab [2 ]
机构：
[1] Hanyang Univ, Div Mat Sci & Engn, Seoul 133791, South Korea
[2] POSCO Tech Res Lab, Pohang 790785, Gyeongbuk, South Korea
来源：
MATERIALS CHARACTERIZATION | 2018年 / 144卷
关键词：
Superaustenitic stainless steel; Sigma phase; Ni; Mn; Depletion zone; MECHANICAL-PROPERTIES; LOCALIZED CORROSION; PITTING CORROSION; CREVICE CORROSION; KINETICS; 800-DEGREES-C; EMBRITTLEMENT; RESISTANCE; TUNGSTEN;
D O I：
10.1016/j.matchar.2018.07.006
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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.
引用
收藏
页码：148 / 154
页数：7
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