Microstructure and tensile properties of laser melting deposited Ti-5Al-5Mo-5V-1Cr-1Fe near β titanium alloy

被引：131
作者：
Liu, C. M. [1 ]
Wang, H. M. [1 ,2 ]
Tian, X. J. [1 ,2 ]
Tang, H. B. [1 ,2 ]
Liu, D. [1 ,2 ]
机构：
[1] Beihang Univ, Lab Laser Mat Proc & Mfg, Beijing 100191, Peoples R China
[2] Beihang Univ, Minist Educ, Key Lab Aerosp Mat, Beijing 100191, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2013年 / 586卷
关键词：
Laser melting deposition; Titanium alloy; Microstructure; Grain boundary; Tensile property; MECHANICAL-PROPERTIES; EVOLUTION; BEHAVIOR; MANUFACTURE; KINETICS; BUILDS; PHASE;
D O I：
10.1016/j.msea.2013.08.032
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A near p titanium alloy Ti-5Al-5Mo-5V-1Cr-1Fe is fabricated by laser melting deposition (LMD). The evolution of its macrostructure and microstructure during LMD process are systematically studied. Then the relationship between the microstructure and tensile properties is further investigated. The macrostructure exhibits unique bamboo-like beta grain morphology, which forms during the solidification and remelt treatment during the LMD process. The microstructures exhibit fine basketweave microstructure and continuous grain boundary alpha (alpha(GB)), whose formation is associated with the complex thermal cycling treatment. Interestingly, an unique fork-like alpha is observed but gradually disappears during the evolution process of microstructure. The underlying mechanism is proposed. Besides, tensile tests show that the fine microstructure results in high strength, and the continuous aGB causes the low ductility and intergranular fracture. Meanwhile, the cracks are prone to propagate along the interface between the columnar and equiaxed regions. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码：323 / 329
页数：7
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