Misorientation dependent thermal condition-solute field cooperative effect on competitive grain growth in the converging case during directional solidification of a nickel-base superalloy

作     者：X.B.Meng J.G.Li C.N.Jing J.D.Liu S.Y.Ma J.J.Liang C.W.Zhang M.Wang B.T.Tang T.Lin J.L.Chen X.L.Zhang Q.Li X.B.Meng;J.G.Li;C.N.Jing;J.D.Liu;S.Y.Ma;J.J.Liang;C.W.Zhang;M.Wang;B.T.Tang;T.Lin;J.L.Chen;X.L.Zhang;Q.Li

作者机构：School of Mechanical and Automotive EngineeringQilu University of Technology(Shandong Academy of Sciences)Jinan 250353China Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and EngineeringShandong Jianzhu UniversityJinan 250014China AECC Shenyang Liming Aero-Engine Co.LTD.Shenyang110043China College of Material Science and EngineeringNorth Minzu UniversityYinchuan 750021China Faculty of electro-mechanical informationWeifang University of Science and TechnologyShouguang262700China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2022年第96卷第1期

页      面：151-159页

核心收录：

学科分类：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）] 

基　　金：financially supported by the Shandong Provincial Natural Science Foundation(No.ZR2020ME110) the National Natural Science Foundation of China(Nos.51331005,U1508213,51771190 and 51601102) the Fund of the State Key Laboratory of Solidification Processing in NWPU(Nos.SKLSP201847 and SKLSP201834) the Young Doctors Cooperation Project in Qilu University of Technology(No.2018BSHZ003) the Key Research and Development Program of Ningxia(No.2019BDE03016) 

主　　题：Competitive grain growth Cooperative effect Thermal condition Solute field Critical misorientation Unusual overgrowth Abnormal transformation 

摘      要：Nowadays,thermal condition and solute field are considered as the potential dominant factors controlling competitive grain growth during directional solidification ***,the controlling modes and critical conditions of competitive grain growth have been drastically debated over the past two *** this work,thermal condition and solute field are combined to study the competitive grain growth in the converging case by experimental observation and numerical simulation of bicrystal *** find the competitive grain growth is controlled by the cooperative effect of thermal condition and solute field,and the controlling modes are related to the bicrystal misorientation between favorably and unfavorably oriented *** the unfavorably oriented grain is low misoriented,unfavorably oriented grain dominates grain selection,and the competitive grain growth performs as solute field ***,with the increase of unfavorably oriented grain’s misorientation,the grain selection converts into favorably oriented grain domination,and the competitive grain growth changes to thermal condition *** explain these abnormal transformation phenomena,we propose a misorientation dependent thermal condition-solute field cooperative domination model and identify the critical conditions by a critical misorientation(θ_(cm)).According to dynamic equation of dendrite growth,we calculate the critical misorientationθ;to prove this *** theoretical calculation results agree well with the experimental results.