Kinetics of the δ/γ interface in the massive-like transformation in Fe-0.3C-0.6Mn-0.3Si alloys. Issue 1 (May 2015)

• Record Type: Journal Article
• Authors: Nishimura, T; Morishita, K; Nagira, T; Yoshiya, M; Yasuda, H
• Is Part Of: IOP conference series. Volume 84:Issue 1(2015)
• Publication Date: 2015-05
• Subjects: Materials science -- Periodicals; 620.1105
• DOI: 10.1088/1757-899X/84/1/012062
• Languages: English
• ISSNs: 1757-8981

Abstract

Abstract: In Fe-C alloys, it has been considered that the peritectic reaction occurs during solidification. Recently, the massive-like transformation, in which δ phase undercooled below the peritectic temperature transforms into γ phase, has been observed by X-ray imaging. It is of interest to know how the δ phase transforms into the γ phase, because the transformation is related to deformation of solidifying shell. Time-resolved and in-situ X-ray imaging with frame rate up to 500 fps was performed to know the δ/γ interface motion in the massive-like transformation in Fe-0.3C-0.6Mn-0.3Si alloys (mass%). The moving velocity of the δ/γ interface locally fluctuated. The average velocity ranged from several mm/s to 200 mm/s. However, no relationship between the moving velocity and the undercooling from the peritectic temperature was observed. The interface was not planar and the morphology continuously changed. The results showed that the stress / strain induced though the transformation from the δ phase to the γ phase in the steel solidification was not simply explained by the conventional peritectic reaction.