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Effect of Direct energy surface modification on fatigue life of rotary friction welded Ti6Al4V ELI fatigue coupons
Nelson Mandela University, Port Elizabeth (ZAF).
Nelson Mandela University, Port Elizabeth (ZAF).
Nelson Mandela University, Port Elizabeth (ZAF).
University West, Grants and Innovation Office (GIO). Nelson Mandela University, Port Elizabeth (ZAF).
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2022 (English)In: International Journal of Fatigue, ISSN 0142-1123, E-ISSN 1879-3452, Vol. 163, article id 107096Article in journal (Refereed) Published
Abstract [en]

Fatigue crack initiation in engineering components is predominantly associated with tensile surface residual stresses or stress raisers caused by discontinuities or mechanical notches. During welding, surface residual stresses arising from plastic mismatch due to the temperature gradient can accelerate the initiation of cracks during cyclic fatigue testing. Direct energy surface treatment is currently considered a viable post-processing methodology for modifying surfaces within the weld zone to improve fatigue life. This paper discusses results obtained during experimental research, investigating the effect of direct energy surface treatment on surface residual stresses, microstructure, and fatigue life of cylindrical rotary friction welded Ti-6Al-4 V samples. Direct energy post-processing technique aided in improving the fatigue life of friction welded specimens by modifying the surface microstructure, introducing a uniform refined and homogenous structure in the welded region. This near-surface refined microstructure inhibited crack initiation in the welded region, shifting initiation sites to an area adjacent to the modified surface region. © 2022 Elsevier Ltd

Place, publisher, year, edition, pages
Elsevier, 2022. Vol. 163, article id 107096
Keywords [en]
Aluminum alloys; Crack initiation; Fatigue testing; Friction; Microstructure; Surface stress; Surface treatment; Ternary alloys; Titanium alloys; Direct energy; Electron back scatter diffraction; Electron backscatter diffraction; Energy; Energy surface; Fatigue crack initiation; Rotary friction; Rotary friction welding; Surface residual stress; Surface-modification; Residual stresses
National Category
Manufacturing, Surface and Joining Technology
Identifiers
URN: urn:nbn:se:hv:diva-19184DOI: 10.1016/j.ijfatigue.2022.107096ISI: 000840991900003Scopus ID: 2-s2.0-85133970330OAI: oai:DiVA.org:hv-19184DiVA, id: diva2:1715710
Note

 The authors would like to express their sincere gratitude to the Nelson Mandela University and Titanium Centre of Competence South Africa for financial support. Residual Stress work was done at European Synchrotron Radiation Facility (ESRF) in Grenoble, France (experi-mental number ME1440 while the EBSD analysis was done at the Nelson Mandela University's Centre for High Resolution Transmission Electron Microscopy (HRTEM).

Available from: 2022-12-02 Created: 2022-12-02 Last updated: 2022-12-20Bibliographically approved

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Steuwer, Axel

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