Cracking behavior and control of β-solidifying Ti-40Al-9V-0.5Y alloy produced by selective laser melting

作     者：Piao Gao Wenpu Huang Huihui Yang Guanyi Jing Qi Liu Guoqing Wang Zemin Wang Xiaoyan Zeng Piao Gao;Wenpu Huang;Huihui Yang;Guanyi Jing;Qi Liu;Guoqing Wang;Zemin Wang;Xiaoyan Zeng

作者机构：Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and TechnologyWuhan 430074China China Academy of Launch Vehicle TechnologyBeijing 100076China 

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

年 卷 期：2020年第39卷第4期

页      面：144-154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：supported financially by the Pre-research Fund Project of Ministry of Equipment and Development of China(No.61409230301) the Fundamental Research Funds for the Central Universities through Program no.2019kfyXMPY005 and no.2019kfyXKJC042 

主　　题：Selective laser melting β-solidifyingγ-TiAl alloy Cracking behavior Cracking control Microstructure Phase transformation 

摘      要：Aβ-solidifying Ti-40 Al-9 V-0.5 Y(at.%)alloy with a high cracking sensitivity has been successfully fabricated by selective laser melting(SLM)in this *** influence factors for cracking sensitivity,cracking behavior and crack inhibition mechanism were *** results show that the effects of process parameters on cracking sensitivity strongly depend on the cooling rate in molten pool with different heat transfer *** conduction mode with higher cooling rates exhibits a higher cracking sensitivity in comparison to the keyhole *** characteristics and phase transformations controlled by cooling rate determine the inherent ductility ofβ-solidifyingγ-Ti Al alloys during *** this basis,the formation and inhibition mechanism of solidification and cold cracking are ***,the crackfree Ti-40 Al-9 V-0.5 Y sample with fine equiaxed microstructures and favorable mechanical properties(microhardness of 542±19 HV,yield strength of 1871±12 MPa,ultimate strength of 2106±13 MPa and ultimate compressive strain of 10.89±0.57%)can be produced by *** strengthening mechanism can be attributed to grain refinement and precipitation strengthening.