Inhibiting primary carbide in steel by diffusion:A perspective of phase-field study  

作　　者：Tongzhao Gong Weiye Hao Weiqi Fan Yun Chen Xing-Qiu Chen Dianzhong Li 

机构地区：[1]Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 10016,China [2]School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 10016,China

出　　处：《Journal of Materials Science & Technology》2024年第35期50-54,共5页材料科学技术(英文版)

基　　金：supported by the National Sci-ence and Technology Major Project(No.J2019-VI-0019-0134);the National Natural Science Foundation of China(No.52203301);the China Postdoctoral Science Foundation(No.2021TQ0335);the Strategic Priority Research Program of the Chinese Academy of Sci-ences(No.XDC04040202).

摘　　要：This study provides a potentially viable approach to manipulate the precipitation of primary carbides in molten steel by modifying the diffusion coefficient of carbon.The solidification process of a Fe-C alloy is simulated using the multi-phase-field method,and we focus on the impact of diffusion coefficient of carbon on the solute segregation and cementite precipitation.Two benefits have been revealed as the ratio of the diffusivities of carbon in solid to that in liquid is increased.A potential advantage is the re-duction in the volume fraction of the residual liquid enriched with carbon during the late solidification.Furthermore,the magnitude of the chemical driving force for the phase transition of cementite precip-itation will be lower.The combined influence of both factors results in an exponential decrease in the volume fraction of cementite formed at the end of solidification.

关 键 词：Fe-C alloy SOLIDIFICATION Primary carbide Solute segregation Phase-field method 

分 类 号：TG1[金属学及工艺—金属学]