Microstructure and Tensile Property of TC4 Alloy Produced via Electron Beam Rapid Manufacturing

doi:10.11900/0412.1961.2019.00007

IMR OpenIR

	Microstructure and Tensile Property of TC4 Alloy Produced via Electron Beam Rapid Manufacturing
	Liu Zheng 1,2; Liu Jianrong 1; Zhao Zibo 1; Wang Lei 1; Wang Qingjiang 1; Yang Rui 1
通讯作者	Liu Jianrong(jrliu@imr.ac.cn)
	2019-06-11
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	55 期号:6 页码:692-700
摘要	Electron beam rapid manufacturing (EBRM) is one of the 3D printing technologies. The main attractions of EBRM technology are its high efficiency and economy in fabricating large, complex near net shape components dielessly and only needing limited machining. In general, the microstructure and texture of titanium alloy can play a significant role in determining its mechanical behaviors. In the present work, the microstructure, texture and tensile property of TC4 alloy produced by electron beam rapid manufacturing (EBRM) are investigated. Results show that the microstructure is comprised of columnar prior beta grains that orient parallel to the building direction. The width of the columnar beta grains increased rapidly at the initial several build layers, and the subsequent increase rate of the width of the columnar beta grains tends to slow down. Fine a lamellae with gradient size are observed inside the columnar prior beta grains, which occur because the alloy experiences different complex thermal histories during the EBRM-produced process. The size of alpha lamellae tends to decrease with the increase of build layers. The XRD result shows that the TC4 alloy has a typical alpha phase texture, (the c-axes are either concentrated at about 45 degrees or are perpendicular to the building direction). At the same time, the <10<(1)over bar>0> poles are relative to random distribution. For the tensile samples along the electron beam scanning direction, the yield strengths do not show significant change with the increase of build layers, but the tensile strengths increase. The ductility of the alloy also has an upward trend, despite of a slightly decreasing ductility in the top sample. The tensile samples at the bottom of the alloy (10 mm and 20 mm away from the substrate) have similar work hardening exponents, which are lower than the top sample. The top sample shows the highest work hardening exponent. This difference in the tensile properties can be highly attributed to the gradient microstructure. The alloy also presents obvious anisotropy in tensile strength. The tensile sample along the 45 degrees direction has a higher strength than the sample along the X direction, while the tensile sample along the Z direction shows the lowest strength. This anisotropic strength is strongly associated with the alpha phase texture. When the loading direction is 45 degrees to the building direction, most of the c-axes of alpha phase are about parallel to the loading direction, showing a "hard" orientation, leading to a higher strength than other oriented samples. Conversely, when the loading direction is along the building direction, most of the alpha phase present a "soft" orientation, resulting in lower strength compared to the tensile samples along the 45 degrees or the X direction.
关键词	EBRM TC4 alloy microstructure texture tensile property
资助者	National Key Research and Development Program of China ; AVIC Science Foundation of China
DOI	10.11900/0412.1961.2019.00007
收录类别	SCI
语种	英语
资助项目	National Key Research and Development Program of China[2017YFB1103100] ; AVIC Science Foundation of China[20175492002]
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000468415300002
出版者	SCIENCE PRESS
引用统计	被引频次：11[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/133427
专题	中国科学院金属研究所
通讯作者	Liu Jianrong
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Liu Zheng,Liu Jianrong,Zhao Zibo,et al. Microstructure and Tensile Property of TC4 Alloy Produced via Electron Beam Rapid Manufacturing[J]. ACTA METALLURGICA SINICA,2019,55(6):692-700.
APA	Liu Zheng,Liu Jianrong,Zhao Zibo,Wang Lei,Wang Qingjiang,&Yang Rui.(2019).Microstructure and Tensile Property of TC4 Alloy Produced via Electron Beam Rapid Manufacturing.ACTA METALLURGICA SINICA,55(6),692-700.
MLA	Liu Zheng,et al."Microstructure and Tensile Property of TC4 Alloy Produced via Electron Beam Rapid Manufacturing".ACTA METALLURGICA SINICA 55.6(2019):692-700.