|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Advanced Real Time Imaging
||Reinforcement of Band Delta-Ferrite Stability by Secondary Particles in AISI 416 Stainless Steel Investigated by in-situ Characterization
||Qianren Tian, Jianxun Fu, Wangzhong Mu
|On-Site Speaker (Planned)
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.
||Characterization, Iron and Steel, Pyrometallurgy