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Microstructure and Tensile Property of TC4 Alloy Produced via Electron Beam Rapid Manufacturing
Liu Zheng1,2; Liu Jianrong1; Zhao Zibo1; Wang Lei1; Wang Qingjiang1; Yang Rui1
Corresponding AuthorLiu Jianrong(jrliu@imr.ac.cn)
2019-06-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume55Issue:6Pages:692-700
AbstractElectron 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.
KeywordEBRM TC4 alloy microstructure texture tensile property
Funding OrganizationNational Key Research and Development Program of China ; AVIC Science Foundation of China
DOI10.11900/0412.1961.2019.00007
Indexed BySCI
Language英语
Funding ProjectNational Key Research and Development Program of China[2017YFB1103100] ; AVIC Science Foundation of China[20175492002]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000468415300002
PublisherSCIENCE PRESS
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/133427
Collection中国科学院金属研究所
Corresponding AuthorLiu Jianrong
Affiliation1.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
Recommended Citation
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.
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