Solidification microstructure of Ti-43Al alloy by twin-roll strip casting

作     者：Yang Chen Guo-huai Liu Ye Wang Zhao-dong Wang Yang Chen;Guo-huai Liu;Ye Wang;Zhao-dong Wang

作者机构：State Key Laboratory of Rolling and AutomationNortheastern UniversityShenyang 110819China College of Material Science and Chemical EngineeringHarbin University of Science and TechnologyHarbin 150080China 

出 版 物：《China Foundry》 (中国铸造（英文版）)

年 卷 期：2023年第20卷第2期

页      面：99-107页

核心收录：

学科分类：08[工学] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：supported by the National Natural Science Foundation of China(52071065) National Key Research and Development Program of China(2016YFB0301201) the Fundamental Research Funds for the Central Universities(N160713001). 

主　　题：TiAl alloy simulation microstructure strip casting solidification 

摘      要：As a near-net-shape technology,the twin-roll strip casting(TRC)process can be considered to apply to the fabrication of TiAl alloy sheets.However,the control of the grain distribution is very important in strip casting because the mechanical properties of strips are directly determined by the solidification microstructure.A three-dimensional(3D)cellular automation finite-element(CAFE)model based on ProCAST software was established to simulate the solidification microstructure of Ti-43Al alloy.Then,the influence of casting temperature and the maximum nucleation density(nmax)on the solidification microstructure was investigated in detail.The simulation results provide a good explanation and prediction for the solidification microstructure in the molten pool before leaving the kissing point.Experimental and simulated microstructure show the common textureorientation in the columnar grains zone.Finally,the microstructure evolution of the Ti-43Al alloy was analyzed and the solidification phase transformation path during the TSC process was determined,i.e.,L→L+β→β→β+α→α+γ+β/B2 phase under a faster cooling rate and L→L+β→β→β+α→γ+lamellar(α_(2)+γ)+β/B2 phase under a slower cooling rate.