Microstructure and mechanical properties of TiAl castings produced by zirconia ceramic mould  

作　　者：Chen Yanfei Xiao Shulong Tian Jing Xu Lijuan Chen Yuyong 

机构地区：[1]School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

出　　处：《China Foundry》2011年第4期371-375,共5页中国铸造（英文版）

基　　金：supported by the National Basic Research Program of China (973 Program) under contract No.2011CB 605502;the National Natural Science Foundation of China under Grant No. 51001040;the Specialized Research Fund for the Doctoral Program of Higher Education within the project No.200802130014;the Development Program for Outstanding Young Teachers in Harbin Institute of Technology (HITQNJS 2009022)

摘　　要：Owing to their low density and attractive high-temperature properties, gamma titanium aluminide alloys （TiAI alloys, hereafter） have significant potential application in the aerospace and automobile industries, in which these materials may replace the heavier nickel-based superalloys at service temperatures of 600 - 900℃. Investment casting of TiAI alloys has become the most promising cost-effective technique for the manufacturing of TiAI components. Ceramic moulds are fundamental to fabricating the TiAI casting components. In the present work, ceramic mould with a zirconia primary coat was designed and fabricated successfully. Investment casting of TiAI blades and tensile test of specimens was carried out to verify the correctness and feasibility of the proposed method. The tensile test results indicate that, at room temperature, the tensile strength and the elongation are about 450 MPa and 0.8%, respectively. At 700℃, the tensile strength decreases to about 410 MPa and the elongation increases to 2.7%. Microstructure and mechanical properties of investment cast TiAl alloy are discussed.Owing to their low density and attractive high-temperature properties, gamma titanium aluminide alloys (TiAl alloys, hereafter) have significant potential application in the aerospace and automobile industries, in which these materials may replace the heavier nickel-based superalloys at service temperatures of 600-900℃. Investment casting of TiAl alloys has become the most promising cost-effective technique for the manufacturing of TiAl components. Ceramic moulds are fundamental to fabricating the TiAl casting components. In the present work, ceramic mould with a zirconia primary coat was designed and fabricated successfully. Investment casting of TiAl blades and tensile test of specimens was carried out to verify the correctness and feasibility of the proposed method. The tensile test results indicate that, at room temperature, the tensile strength and the elongation are about 450 MPa and 0.8%, respectively. At 700℃, the tensile strength decreases to about 410 MPa and the elongation increases to 2.7%. Microstructure and mechanical properties of investment cast TiAl alloy are discussed.

关 键 词：investment casting TiAI alloys ceramic moulds ZIRCONIA 

分 类 号：TG146.23[一般工业技术—材料科学与工程]