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Crystallographic features of alpha variants and beta phase for Ti-6Al-4V alloy fabricated by selective laser melting
Yang, Y.; Liu, Y. J.; Chen, J.; Wang, H. L.; Zhang, Z. Q.; Lu, Y. J.; Wu, S. Q.; Lin, J. X.; Yang, Y; Lin, JX (reprint author), Chinese Acad Sci, Key Lab Optoelect Mat Chem & Phys, Fujian Inst Res Struct Matter, Fuzhou 350002, Fujian, Peoples R China.
2017-11-07
Source PublicationELSEVIER SCIENCE SA
ISSN0921-5093
Volume707Pages:548-558
AbstractThe present study investigated the crystallographic features of a variants and beta phase for Ti-6Al-4V alloy fabricated by selective laser melting. The <100>(beta) fiber texture parallel to the building direction was ascertained on the basis of a reconstruction method realized by the manipulation of stereographic projection. The SLMed alloy has no alpha/alpha' variants selection but contains a special crystallographic area exhibiting random orientation which cannot be reconstructed as a parental columnar beta grain with the present introduced method due to its nature as the overlapped area between adjacent melt pools resulting from the heterogeneous nucleation in front of the liquid-solid interface. With increasing the heat treated temperature, alpha variants selection occurs. Especially at higher temperature of 905 degrees C, the intergranular beta phase following a reversed crystallographic path as "parental beta phase"->"alpha variants"->"intergranular beta phase" would be precipitated, therefore the intergranular beta phase keeps the same orientation with the parental beta phase. Once the alloy was heat treated at 975 degrees C close to T-beta, the microstructure is characterized by primary alpha variants selection and a large amount of secondary a widmanstatten structure with a homogeneous orientation which accounts for the lowest tensile strength. The decomposition of twelve alpha variants proved the BOR <110>(beta)//(0001)(alpha), <111>(beta)//<2-1-10>(alpha). The misorientation between two variants sharing a common parental <100>(beta) pole with a similar color consisting of all Euler angles was identified to be [0001] (alpha)/10.53 degrees.; The present study investigated the crystallographic features of a variants and beta phase for Ti-6Al-4V alloy fabricated by selective laser melting. The <100>(beta) fiber texture parallel to the building direction was ascertained on the basis of a reconstruction method realized by the manipulation of stereographic projection. The SLMed alloy has no alpha/alpha' variants selection but contains a special crystallographic area exhibiting random orientation which cannot be reconstructed as a parental columnar beta grain with the present introduced method due to its nature as the overlapped area between adjacent melt pools resulting from the heterogeneous nucleation in front of the liquid-solid interface. With increasing the heat treated temperature, alpha variants selection occurs. Especially at higher temperature of 905 degrees C, the intergranular beta phase following a reversed crystallographic path as "parental beta phase"->"alpha variants"->"intergranular beta phase" would be precipitated, therefore the intergranular beta phase keeps the same orientation with the parental beta phase. Once the alloy was heat treated at 975 degrees C close to T-beta, the microstructure is characterized by primary alpha variants selection and a large amount of secondary a widmanstatten structure with a homogeneous orientation which accounts for the lowest tensile strength. The decomposition of twelve alpha variants proved the BOR <110>(beta)//(0001)(alpha), <111>(beta)//<2-1-10>(alpha). The misorientation between two variants sharing a common parental <100>(beta) pole with a similar color consisting of all Euler angles was identified to be [0001] (alpha)/10.53 degrees.
description.department[yang, y. ; lu, y. j. ; wu, s. q. ; lin, j. x.] chinese acad sci, key lab optoelect mat chem & phys, fujian inst res struct matter, fuzhou 350002, fujian, peoples r china ; [liu, y. j.] edith cowan univ, sch engn, 270 joondalup dr, perth, wa 6027, australia ; [chen, j.] stockholm univ, dept mat & environm chem, arrhenius lab, s-10691 stockholm, sweden ; [wang, h. l. ; zhang, z. q.] chinese acad sci, titanium alloys dept, inst met res, shenyang 110016, liaoning, peoples r china ; [wang, h. l.] huandian elect power res inst, hangzhou 310030, zhejiang, peoples r china
KeywordSelective Laser Melting Heat Treatment Microstructure Evolution Crystallographic Reconstruction Alpha Variants Selection Prior Beta Phase Reconstruction
Subject AreaNanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/78986
Collection中国科学院金属研究所
Corresponding AuthorYang, Y; Lin, JX (reprint author), Chinese Acad Sci, Key Lab Optoelect Mat Chem & Phys, Fujian Inst Res Struct Matter, Fuzhou 350002, Fujian, Peoples R China.
Recommended Citation
GB/T 7714
Yang, Y.,Liu, Y. J.,Chen, J.,et al. Crystallographic features of alpha variants and beta phase for Ti-6Al-4V alloy fabricated by selective laser melting[J]. ELSEVIER SCIENCE SA,2017,707:548-558.
APA Yang, Y..,Liu, Y. J..,Chen, J..,Wang, H. L..,Zhang, Z. Q..,...&Lin, JX .(2017).Crystallographic features of alpha variants and beta phase for Ti-6Al-4V alloy fabricated by selective laser melting.ELSEVIER SCIENCE SA,707,548-558.
MLA Yang, Y.,et al."Crystallographic features of alpha variants and beta phase for Ti-6Al-4V alloy fabricated by selective laser melting".ELSEVIER SCIENCE SA 707(2017):548-558.
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