Analysis of Mechanical Properties of TC4 Titanium Alloy Formed by Laser Selective Melting and Casting
ZONG Xuewen1, LIU Wenjie1, ZHANG Jian1, YANG Yumeng2, GAO Zhongtang1
1 College of Mechanical Engineering, Xi’an University of Science and Technology, Xi’an 710054, China; 2 AVIC Optoelectronic Technology Co., Ltd., Luoyang 471023, China
Abstract: With the help of finite element simulation, optical microscope (OM), scanning electron microscope (SEM), energy spectrum analysis (EDS), and Vickers hardness tester, the microstructure evolution and mechanical properties of TC4 titanium alloy by laser selective mel-ting and cast were studied. The effects of solidification and cooling of liquid metal on its microstructure and mechanics under different forming conditions were analyzed. The results show that laser selective melting and casting were basket structure of the needle-shaped martensite α′ phase and the Wei’s structure of α+β phase. Compared with casting, the laser selective melting TC4 titanium alloy had an extremely fast cooling rate (1.78×107 ℃·s-1) and a large temperature gradient, with the same element type and obvious crystal orientation. Meanwhile, the tensile strength, yield strength, elongation and hardness of the TC4 specimens formed by SLM were 1 120.83 MPa, 916.31 MPa, 9.5% and 123.04HV, while the tensile strength, yield strength, elongation and hardness of the TC4 specimens formed by casting were 917.67 MPa, 786.23 MPa, 8.0% and 77.876HV, compared with cast, the tensile strength, yield strength, elongation and hardness of TC4 specimens formed by SLM forming increased by 22.14%, 16.54% ,18.75% and 58%. Therefore,laser selective melting had better mechanical performance index.
1 Wu S,Lu Y,Huang T,et al. Journal of Alloys and Compounds,2016, 672(5),643. 2 Zhao Z,Chen J,Zhao X,et al. Rare Metal Materials and Engineering, 2017, 46(7),1792. 3 Li H, Huang B, Sun F, et al. Rare Metal Materials and Engineering, 2013, 42, 209. 4 Wei S Y,He Y,Zhu P. In: The 14th Annual Conference of Materials Science and Alloy Processing of China Society of Non-ferrous Metals. Sanya,China,2011,pp.367(in Chinese). 魏寿庸,何瑜,祝瀑. 中国有色金属学会第十四届材料科学与合金加工学术年会.三亚,2011,pp.367. 5 Zong X W,Liu W J,Yang X D,et al. Special Casting and Nonferrous Alloy, 2019,39(10),1106(in Chinese). 宗学文,刘文杰,杨学东,等.特种铸造及有色合金,2019,39(10),1106. 6 Guo Z Y,Hou H,Zhao Y H,et al. Foundry Technology, 2011,32(3),392(in Chinese). 郭志宏,候华,赵宇宏,等.铸造技术,2011,32(3),392. 7 Zong X W,Liu W J,Xiong C,et al. Journal of Aeronautical Materials, 2019,39(5),103(in Chinese). 宗学文,刘文杰,熊聪.航空材料学报,2019,39(5),103. 8 Hyun J J, Jaeho C, Byoung-Soo L, et al. Materials Science and Technology, 2019,35(3),248. 9 Li H J.Comparative studying of Ti4 titanium alloy prepared by 3D prin-ting,traditional casting and forging. Master’s Thesis, North China University of Technology, China,2019(in Chinese). 李豪杰.激光选区熔化与传统加工TC4钛合金组织与力学性能对比研究.硕士学位论文,北方工业大学,2019. 10 Ou M G,Xia Q F,Song H C,et al. Rare Metal Materials and Enginee-ring, 2019,48(2),639. 11 Zong X W,Liu W J,Yang X D,et al. Rare Metal Materials and Enginee-ring, 2020,49(5),1681. 12 Rubenchik A, Wu S, Mitchell S, et al. Applied Optics, 2015, 54(24), 7230. 13 Gu D, Meiners W, Wissenbach K,et al.International Materials Review, 2012, 57 (3),133. 14 Zhou T J.Experimental investigation and finite element analysis on centri-fugal casting of Al-4.5%Cu alloys. Master’s Thesis, Harbin Institute of Technology,China,2010(in Chinese). 周同金. Al-4.5%Cu合金离心铸造工艺实验研究及有限元分析. 硕士学位论文,哈尔滨工业大学, 2010. 15 Zhou Y H, Zhang Z H, Wang Y P, et al. Additive Manufacturing, 2019, 25,204. 16 Wei P, Wei Z Y, Chen Z, et al. Applied Surface Science, 2017, 408, 38. 17 Liu T T, Zhang C D, Liao W H, et al. Chinese Journal of Laser,2016,43(12),1202004.
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2020, Vol. 34 
