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Investigation of beta fleck formation in Ti-17 alloy by directional solidification method
Yin, Xuchen1,2; Liu, Jianrong2; Wang, Qingjiang2; Wang, Lei2
Corresponding AuthorLiu, Jianrong(jrliu@imr.ac.cn)
2020-07-01
Source PublicationJOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN1005-0302
Volume48Pages:36-43
AbstractBeta flecks are one of the most common defects occur in some alpha + beta and beta titanium alloys. In this study, formation of beta flecks in Ti-17 alloy was investigated by directional solidification experiments. Samples were directionally solidified under a constant temperature gradient of 2 x 10(4) K/m and a wide range of withdrawal rates (R) from 3 mm/h to 150 mm/h. We find that macrostructure of the directionally solidified Ti-17 samples can be characterized by "four zones and two lines" after the heat treatment. Profile of the solid-liquid interface transits from planar to cellular to dendritic shape with solidification rate increasing from 3 mm/h to 150 mm/h. The critical rates for planar to cellular (R-c1) transition and cellular to dendritic (R-c2) transition can be well predicted based on the traditional solidification theory. Dark and light contrast areas in macrostructure are directly related to elemental segregation. Dark contrast areas are rich of Cr, Zr but lean of Mo, while no apparent segregation is found in light contrast areas and the mean level of Cr, Zr is lower and Mo is higher in this area than that in dark contrast areas. We conclude that beta-flecks in Ti-17 titanium alloy are induced by segregation of alloying elements with k<1 and their shape and size are determined by solidification conditions. Based on the findings of the present article and other literatures, three types of beta-flecks are proposed and their formation mechanisms are discussed. (C) 2020 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
KeywordTitanium Alloy Beta flecks Directional solidification Elemental segregation Microstructure heterogeneity
DOI10.1016/j.jmst.2019.12.018
Indexed BySCI
Language英语
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000534323200006
PublisherJOURNAL MATER SCI TECHNOL
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/138895
Collection中国科学院金属研究所
Corresponding AuthorLiu, Jianrong
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
Recommended Citation
GB/T 7714
Yin, Xuchen,Liu, Jianrong,Wang, Qingjiang,et al. Investigation of beta fleck formation in Ti-17 alloy by directional solidification method[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2020,48:36-43.
APA Yin, Xuchen,Liu, Jianrong,Wang, Qingjiang,&Wang, Lei.(2020).Investigation of beta fleck formation in Ti-17 alloy by directional solidification method.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,48,36-43.
MLA Yin, Xuchen,et al."Investigation of beta fleck formation in Ti-17 alloy by directional solidification method".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 48(2020):36-43.
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