In-situ observation and analysis of high temperature behavior of carbides in GCr15 bearing steel by confocal laser scanning microscopy  

作　　者：Jun Ren Yue Teng Xiang Liu Xi Xu Hui-gai Li Ke Han Qi-jie Zhai 

机构地区：[1]State Key Laboratory of Advanced Special Steel and Shanghai Key Laboratory of Advanced Ferrometallurgy and School of Materials Science and Engineering,Shanghai University,Shanghai,200444,China [2]Center for Advanced Solidification Technology(CAST),School of Materials Science and Engineering,Shanghai University,Shanghai,200444,China [3]Ansteel Group Iron and Steel Research Institute,Anshan,114000,Liaoning,China [4]National High Magnetic Field Laboratory,Florida State University,Tallahassee,FL,32310,USA

出　　处：《Journal of Iron and Steel Research International》2025年第2期409-417,共9页钢铁研究学报(英文版)

基　　金：supported by Independent Research Project of State Key Laboratory of Advanced Special Steel,Shanghai Key Laboratory of Advanced Ferrometallurgy,Shanghai University(SKLASS-2023-Z13);the Science and Technology Commission of Shanghai Municipality(No.19DZ2270200);A portion of the work was performed at US National High Magnetic Field Laboratory,which is supported by the National Science Foundation(Cooperative Agreement No.DMR-1157490 and DMR-1644779);the State of Florida.Thanks also to Mary Tyler for editing.

摘　　要：The high-temperature dissolution behavior of primary carbides in samples taken from GCr15 continuous-casting bloom was observed in-situ by confocal laser scanning microscopy.Equations were fitted to the dissolution kinetics of primary carbides during either heating or soaking.Dissolution of carbides proceeded in three stages(fast→slow→faster)as either temperature or holding time was increased.During the heating process and during the first and third stages of the soaking process,the original size of the carbides determined the steepness of the slope,but during the middle(“slow”)stage of the soaking process,the slope remained zero.The initial size of the carbides varied greatly,but their final dissolution temperature fell within the narrow range of 1210-1235℃,and the holding time remained within 50 min.Fractal analysis was used to study the morphological characteristics of small and medium-sized carbides during the dissolution process.According to changes in the fractal dimension before and after soaking,the carbides tended to evolve towards a more regular morphology.

关 键 词：Bearing steel High-temperature confocal laser scanning microscope In-situ observation Primary carbide Fractal analysis 

分 类 号：TG1[金属学及工艺—金属学]