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Correlation of fatigue properties and microstructure in investment cast Ti-6Al-4V welds

Title
Correlation of fatigue properties and microstructure in investment cast Ti-6Al-4V welds
Authors
Oh, JKim, NJLee, SLee, EW
POSTECH Authors
Kim, NJLee, S
Date Issued
Jan-2003
Publisher
ELSEVIER SCIENCE SA
Abstract
The effect of microstructural characteristics on high-cycle fatigue properties and fatigue crack propagation behavior of welded regions of an investment cast Ti-6Al-4V were investigated. High-cycle fatigue and fatigue crack propagation tests were conducted on the welded regions, which were processed by two different welding methods: tungsten inert gas (TIG) and electron beam (EB) welding. Test data were analyzed in relation to microstructure, tensile properties, and fatigue fracture mode. The base metal was composed of an alpha plate colony structure transformed to a basket-weave structure with thin a platelets after welding and annealing. High-cycle fatigue results indicated that fatigue strength of the EB weld was lower than that of the base metal or the TIG weld because of the existence of large micropores formed during welding, although it had the highest yield strength. In the case of the fatigue crack propagation, the EB weld composed of thinner a platelets had a faster crack propagation rate than the base metal or the TIG weld. The effective microstructural feature determining the fatigue crack propagation rate was found to be the width of a platelets because it was well matched with the reversed cyclic plastic zone size calculated in the threshold DeltaK regime. (C) 2002 Elsevier Science B.V. All rights reserved.
Keywords
Ti-6A1-4V; EB weld; TIG weld; high-cycle fatigue; fatigue crack growth; welding pores; titanium castings; CRACK-GROWTH-BEHAVIOR; TITANIUM-ALLOY; TRANSITIONS; INITIATION
URI
http://oasis.postech.ac.kr/handle/2014.oak/29823
ISSN
0921-5093
Article Type
Article
Citation
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, vol. 340, no. 1-2, page. 232 - 242, 2003-01
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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