Coalescence-dominated microstructure evolution during solidification of 20SiMn steel

作     者：Xiao-ping Ma Dian-zhong Li Xiao-ping Ma;Dian-zhong Li

作者机构：Shenyang National Laboratory for Materials ScienceInstitute of Metal ResearchChinese Academy of SciencesShenyang 110016LiaoningChina 

出 版 物：《Journal of Iron and Steel Research International》 (国际钢铁研究杂志)

年 卷 期：2020年第27卷第5期

页      面：506-516页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

主　　题：Solidification Microstructure Coalescence Steel Microsegregation 

摘      要：The evolution of microstructures during the solidification of 20SiMn steel was *** dominant role of coalescence was revealed by analyzing the quenched microstructures and the solute *** the parameter range investigated,including the slow solidification,the fast solidification and the directional solidification,the coalescence can happen at multiple solidification stages and on *** the directional solidification,the ternary and fourth dendritic arms coalesce into the secondary dendritic arms,and the secondary dendritic arms further coalesce to produce the cellular *** cellular crystals become coarse through further *** the non-directional solidification,the initial microstructures are discrete crystals without the dendritic *** the dendritic arms and dendritic stems appearing in the later solidification stage are produced by the coalescence on *** coalescence is more significant in the later solidification *** mechanism of coalescence is attributed to different melt compositions in different local domains and the reduction of the interface energy.