Formation Mechanism of Band Delta-Ferrite in 416 Stainless Steel and Its Relationship with MnS and M23C6

被引：0
|
作者：
Wang, Yi [1 ,2 ]
Tian, Qianren [1 ,2 ]
Xu, Xiangyu [1 ,2 ]
Fu, Jianxun [1 ,2 ]
机构：
[1] Shanghai Univ, Sch Mat Sci & Engn, Ctr Adv Solidificat Technol, Shanghai 200444, Peoples R China
[2] Shanghai Univ, State Key Lab Adv Special Steel, Shanghai 200444, Peoples R China
来源：
TMS 2024 153RD ANNUAL MEETING & EXHIBITION: SUPPLEMENTAL PROCEEDINGS | 2024年
关键词：
416 stainless steel; Banded structure; Segregation; MnS inclusion; M23C6; Pinning effect;
D O I：
10.1007/978-3-031-50349-8_38
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
AISI 416 steel with a banded structure (BS) that is formed by element segregation, and its MnS significantly affects its microstructure and properties during the hot working process. In this study, we investigated the formation mechanism of the BS and its relationship with MnS in 416 steel by carrying out thermodynamic calculations and microscopic characterization measurements. The BS was identified to be a delta-ferrite phase rich in Cr. In addition, when the volume fraction of delta-ferrite was the largest during the 1665 K, the BS was most likely to precipitate. The fine M23C6 particles around the BS enhanced the segregation of Cr and worked with the MnS inclusions to pin the surrounding grains. The metastable-banded structure formed near the BS transformed into a martensite phase. The MnS inclusions pinned and refined the grains and showed four types of distributions.
引用
收藏
页码：443 / 453
页数：11
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