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Article: Effect of electron beam welding on the microstructures and mechanical properties of thick TC4-DT alloy
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TitleEffect of electron beam welding on the microstructures and mechanical properties of thick TC4-DT alloy
 
AuthorsLu, W1
Shi, Y1
Lei, Y1
Li, X1
 
KeywordsMetallography
Non-Ferrous Metals And Alloys
Welding
 
Issue Date2012
 
CitationMaterials And Design, 2012, v. 34, p. 509-515 [How to Cite?]
DOI: http://dx.doi.org/10.1016/j.matdes.2011.09.004
 
AbstractElectron beam welding (EBW) was applied to 50. mm thick damage-tolerant Ti-6Al-4V (TC4-DT) alloy, and microstructure, microhardness and tensile properties of the defect-free welded joints were examined. The results indicated that the microstructure of the base metal is composed of primary α phases and the lamellar (α + β) bimodal structure. For the EBW joint, martensite basketweave microstructure is formed in fusion zone (FZ). Moreover, the heat affected zone (HAZ) near FZ consists of acicular martensite and a small portion of primary α phase. The HAZ near base metal consists of primary α phase and transformed β containing aciculate α. It is found that the boundary of the two portions of the HAZ was dependent on the β phase transus temperature during weld cooling. Microhardness values for FZ and HAZ are higher than that of base metal, and there are the peak values for the HAZ near the weld metal. The fracture locations of all the EBW tensile specimens are in base metal, and the ultimate tensile strength of the joints may reach about 95% of the base metal. In addition, with the depth increasing along the weld thick direction, the grain size of the FZ decreases and microhardness increases. © 2011 Elsevier Ltd.
 
ISSN0261-3069
2012 Impact Factor: 2.913
2012 SCImago Journal Rankings: 1.838
 
DOIhttp://dx.doi.org/10.1016/j.matdes.2011.09.004
 
ReferencesReferences in Scopus
 
DC FieldValue
dc.contributor.authorLu, W
 
dc.contributor.authorShi, Y
 
dc.contributor.authorLei, Y
 
dc.contributor.authorLi, X
 
dc.date.accessioned2012-10-08T03:20:53Z
 
dc.date.available2012-10-08T03:20:53Z
 
dc.date.issued2012
 
dc.description.abstractElectron beam welding (EBW) was applied to 50. mm thick damage-tolerant Ti-6Al-4V (TC4-DT) alloy, and microstructure, microhardness and tensile properties of the defect-free welded joints were examined. The results indicated that the microstructure of the base metal is composed of primary α phases and the lamellar (α + β) bimodal structure. For the EBW joint, martensite basketweave microstructure is formed in fusion zone (FZ). Moreover, the heat affected zone (HAZ) near FZ consists of acicular martensite and a small portion of primary α phase. The HAZ near base metal consists of primary α phase and transformed β containing aciculate α. It is found that the boundary of the two portions of the HAZ was dependent on the β phase transus temperature during weld cooling. Microhardness values for FZ and HAZ are higher than that of base metal, and there are the peak values for the HAZ near the weld metal. The fracture locations of all the EBW tensile specimens are in base metal, and the ultimate tensile strength of the joints may reach about 95% of the base metal. In addition, with the depth increasing along the weld thick direction, the grain size of the FZ decreases and microhardness increases. © 2011 Elsevier Ltd.
 
dc.description.natureLink_to_subscribed_fulltext
 
dc.identifier.citationMaterials And Design, 2012, v. 34, p. 509-515 [How to Cite?]
DOI: http://dx.doi.org/10.1016/j.matdes.2011.09.004
 
dc.identifier.doihttp://dx.doi.org/10.1016/j.matdes.2011.09.004
 
dc.identifier.epage515
 
dc.identifier.issn0261-3069
2012 Impact Factor: 2.913
2012 SCImago Journal Rankings: 1.838
 
dc.identifier.scopuseid_2-s2.0-80053437635
 
dc.identifier.spage509
 
dc.identifier.urihttp://hdl.handle.net/10722/168569
 
dc.identifier.volume34
 
dc.languageeng
 
dc.relation.ispartofMaterials and Design
 
dc.relation.referencesReferences in Scopus
 
dc.subjectMetallography
 
dc.subjectNon-Ferrous Metals And Alloys
 
dc.subjectWelding
 
dc.titleEffect of electron beam welding on the microstructures and mechanical properties of thick TC4-DT alloy
 
dc.typeArticle
 
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Author Affiliations
  1. Beijing University of Technology