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2019 №09 (02) DOI of Article
2019 №09 (04)

Automatic Welding 2019 #09
Avtomaticheskaya Svarka (Automatic Welding), #9, 2019, pp. 26-30

High cycle fatigue property of electron beam welded thick section of Ti-6Al-4V plates

Zhang YP, Dong CL, Wang YQ, Hou B, Yu C, Fang WP, Xu WH
Advanced Materials Centre, Guangdong Welding Institute (China-Ukraine E.O. Paton Institute of Welding). Guangzhou, 510651 PR. China. E-mail: wangyg@qwi.gd.cn

The 100 mm thickness Ti-6Al-4V plates were welded by the electron beam (EBW) method. Microstructures and mechanical properties including tensile and fatigue fracture behavior of the joint have been studied. The results shown that the joint has obviously textural and mechanical heterogeneity in the thickness direction, the joint show excellent fatigue resistance though the middle layer of the joint has lower fatigue life at the same stress and survival rate. The fatigue crack initiates from the free surface of the specimen by the transgranular fracture mode. The fatigue deformation depicted by the dislocations of the joint in each layer  is adapt to the planar-slip mechanism. 6 Ref., 1 Tabl., 5 Fig.
Keywords: Ti-6Al-4V, microstructure, mechanical property, fatigue

Надійшла до редакції 01.07.2019


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