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Article: Effect of electron beam welding on the microstructures and mechanical properties of thick TC4-DT alloy

TitleEffect of electron beam welding on the microstructures and mechanical properties of thick TC4-DT alloy
Authors
KeywordsMetallography
Non-Ferrous Metals And Alloys
Welding
Issue Date2012
Citation
Materials And Design, 2012, v. 34, p. 509-515 How to Cite?
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.
Persistent Identifierhttp://hdl.handle.net/10722/168569
ISSN
2015 Impact Factor: 3.997
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLu, Wen_US
dc.contributor.authorShi, Yen_US
dc.contributor.authorLei, Yen_US
dc.contributor.authorLi, Xen_US
dc.date.accessioned2012-10-08T03:20:53Z-
dc.date.available2012-10-08T03:20:53Z-
dc.date.issued2012en_US
dc.identifier.citationMaterials And Design, 2012, v. 34, p. 509-515en_US
dc.identifier.issn0261-3069en_US
dc.identifier.urihttp://hdl.handle.net/10722/168569-
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.en_US
dc.languageengen_US
dc.relation.ispartofMaterials and Designen_US
dc.subjectMetallographyen_US
dc.subjectNon-Ferrous Metals And Alloysen_US
dc.subjectWeldingen_US
dc.titleEffect of electron beam welding on the microstructures and mechanical properties of thick TC4-DT alloyen_US
dc.typeArticleen_US
dc.identifier.emailLu, W:luwei@hku.hken_US
dc.identifier.authorityLu, W=rp00754en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.matdes.2011.09.004en_US
dc.identifier.scopuseid_2-s2.0-80053437635en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-80053437635&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume34en_US
dc.identifier.spage509en_US
dc.identifier.epage515en_US
dc.identifier.isiWOS:000298120300068-
dc.identifier.scopusauthoridLu, W=27868087600en_US
dc.identifier.scopusauthoridShi, Y=7404964763en_US
dc.identifier.scopusauthoridLei, Y=7201592928en_US
dc.identifier.scopusauthoridLi, X=35275562100en_US

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