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Study on the Uniformity of Structure and Mechanical Properties of TC4-DT Alloy Deposited by CMT Process
Du Zijie1,2; Li Wenyuan2; Liu Jianrong2; Suo Hongbo3; Wang Qingjiang2
Corresponding AuthorLi Wenyuan(wyli@imr.ac.cn)
2020-12-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume56Issue:12Pages:1667-1680
AbstractTC4-DT alloy is developed based on TC4 alloy, with medium strength and high damage-tolerance, showing a great promise to be widely used in aerospace field. However, the traditional method to fabricate large and complicated parts has the problems of hot working difficulty, long processing cycle, low "buy-to-fly" ratio and high-cost. Additive manufacturing (AM) technology is a good alternative and has been used to manufacture titanium parts since year 2006. Compared to other AM technologies, cold metal transfer mode wire and arc additive manufacturing (CMT WARM), as a kind of gas metal arc welding (GMAW) technology, has several advantages like simple structure, good spatial accessibility and high efficiency. In this study, a TC4-DT deposit was fabricated by CMT WAAM method. The macrostructure and microstructure, texture, and tensile properties in the overlapping zone and ordinary deposition zone were investigated and compared. The bottom of the ordinary deposition zone consisted of columnar and equiaxed prior beta grains, and in higher zone the coarse equiaxed prior beta grains were in the majority. The microstructure of the ordinary deposition zone was mainly characterized by basketweave alpha phase platelets. Microstructure of both sides of the overlapping line was characterized by a mixture of fine basketweave, lamellar and coarse basketweave a phase due to temperature gradient. Transformed alpha texture from {001}(beta)//Z silk texture existed in different zones, and the texture of overlapping zone was complicated due to the complexity of heat dissipation conditions, including transformed a texture and other complicated texture. EBSD results showed that there was a strong <0001>(alpha)//X texture at the overlapping line, resulting in low Schmid factors for both prismatic slip and basal slip at the overlapping line, hindering the slip of dislocation. Combined with the Hall-Petch relationship, it was concluded that the prior beta grain boundary and the overlapping line were main factors affecting the uniformity of mechanical properties. The average effective dislocation slip distances in different zones had the following relationship: overlapping zone.
KeywordCMT WAAM TC4-DT titanium alloy uniformity of microstructure texture uniformity of mechanical property
DOI10.11900/0412.1961.2020.00104
Indexed BySCI
Language英语
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000592474600009
PublisherSCIENCE PRESS
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Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/141443
Collection中国科学院金属研究所
Corresponding AuthorLi Wenyuan
Affiliation1.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
3.Qingdao JointX Intelligent Mfg Ltd, Qingdao 266109, Peoples R China
Recommended Citation
GB/T 7714
Du Zijie,Li Wenyuan,Liu Jianrong,et al. Study on the Uniformity of Structure and Mechanical Properties of TC4-DT Alloy Deposited by CMT Process[J]. ACTA METALLURGICA SINICA,2020,56(12):1667-1680.
APA Du Zijie,Li Wenyuan,Liu Jianrong,Suo Hongbo,&Wang Qingjiang.(2020).Study on the Uniformity of Structure and Mechanical Properties of TC4-DT Alloy Deposited by CMT Process.ACTA METALLURGICA SINICA,56(12),1667-1680.
MLA Du Zijie,et al."Study on the Uniformity of Structure and Mechanical Properties of TC4-DT Alloy Deposited by CMT Process".ACTA METALLURGICA SINICA 56.12(2020):1667-1680.
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