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Meeting 2023 TMS Annual Meeting & Exhibition
Symposium Advanced Real Time Imaging
Presentation Title Reinforcement of Band Delta-Ferrite Stability by Secondary Particles in AISI 416 Stainless Steel Investigated by in-situ Characterization
Author(s) Qianren Tian, Jianxun Fu, Wangzhong Mu
On-Site Speaker (Planned) Qianren Tian
Abstract Scope The mechanical characteristics of AISI 416 stainless steel at high temperature, such as hot rolling cracking, can be negatively impacted by band δ-ferrite. This work investigated the effect of secondary particles,M23C6 and sulfide, on the band δ-ferrite stability in AISI 416 stainless steel by combining confocal laser scanning microscopy (CLSM) and electron probe micro-analyzer (EPMA). The secondary particles act as the barriers to the diffusion of Cr and C in the band, this effect enhances the stability of the band at the rolling temperature (1170 °C). The length and width of each grain in band δ-ferrite are approximately 15 to 20 and 5 μm, respectively. The spacing between the bands is in the range of 30 to 60 μm. During the cooling process, these bands are difficult to transform into martensite at a cooling rate of 5°C/s, which might be the reason to lead to the steel cracking.
Proceedings Inclusion? Planned:
Keywords Characterization, Iron and Steel, Pyrometallurgy


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