Revealing in-situ phase transition during laser additive manufacturing via high-speed synchrotron X-ray diffraction and imaging

作者：Lianghua Xiong, Shuya Zhang, Cang Zhao, Niranjan D. Parab, Tao Sun, Andrew Chihpin Chuang, Kamel Fezzaa, Anping Dong, Baode Sun · 发表于：Materials Research Letters · 年份：2024 · DOI：10.1080/21663831.2024.2404539 · 被引用次数：7 · 研究领域：Additive Manufacturing Materials and Processes、High Entropy Alloys Studies、Additive Manufacturing and 3D Printing Technologies

Phase transition at the initial solidification stage notably affects subsequent phase structure of peritectic alloys, however, detailed dynamics between entangled three-phase region remains ambiguous in the far-from-equilibrium condition during laser additive manufacturing. Here, in-situ peritectic phase transition during single-layer laser printing of an exemplary 304L stainless steel is directly investigated and quantified at high temporospatial resolution by high-speed synchrotron X-ray diffraction and imaging. These quantitative observations clarify the mechanism of coupled peritectic growth and local remelting at three-phase region. The results revealed provide in-depth understanding of phase transformation dynamics and delicate design of phase structure for metal additive manufacturing.