Kinetic Model to Investigate the Effect of Cooling Rate on δ-Ferrite Behavior and Its Application in Continuous Casting of AISI 304 Stainless Steel

Tahereh Zargar; Fazlollah Sadeghi; Jong Wan Kim; Jae Sang Lee; Yoon‑Uk Heo; Chang Hee Yim

doi:10.1007/s12540-021-01118-z

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자료유형: 학술저널

저자정보: Tahereh Zargar (Pohang University of Science and Technology) Fazlollah Sadeghi (Pohang University of Science and Technology) Jong Wan Kim (POSCO) Jae Sang Lee (Pohang University of Science and Technology) Yoon‑Uk Heo (Pohang University of Science and Technology) Chang Hee Yim (Pohang University of Science and Technology)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.28 No.9

발행연도: 2022.9

수록면: 2,263 - 2,276 (14page)

DOI: 10.1007/s12540-021-01118-z

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The prediction of M-shaped δ-ferrite content along the thickness direction of continuously cast 304 austenitic stainless steelslab was performed using a diffusion-controlled phase transformation module of Thermo-Calc software. The surface andcenter of the slab, which solidified with different cooling rates and secondary dendrite arm spacing, were used for kineticcalculations. Comparison between observations and calculations for slab specimens demonstrated that the moving-boundarymodel could predict retained δ-ferrite content according to various thermal histories. After this validation, the effects ofdifferent cooling rates at liquid and solid-state were analyzed to understand the importance of each stage on the diffusioncontrolledδ → phase transformation. Decrease in solid-state cooling rate generally had a larger effect on the reduction ofδ-ferrite during cooling when the solidification rate was fast (27.75 °C/s) than when it was slow (0.075 °C/s). This model canbe used to predict and control δ-ferrite behavior under different thermal histories during slab casting and welding practices.

#Kinetics modeling · Solidification path · Austenitic stainless steel · Retained δ-ferrite · Diffusion-controlled transformation

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