Internal fatigue crack initiation in drawn Ti–6Al–4V wires. Issue 16 (1st November 2016)

• Record Type: Journal Article
• Authors: Everaerts, J.; Verlinden, B.; Wevers, M.
• Is Part Of: Materials science and technology. Volume 32:Issue 16(2016)
• Page Start: 1639
• Page End: 1645
• Publication Date: 2016-11-01
• Subjects: Fatigue -- Titanium -- Ti–6Al–4V alloy -- Subsurface initiation -- Internal initiation -- Fish-eye fracture -- Facets -- Crystallographic texture; Materials science -- Periodicals; Microstructure -- Periodicals; Metallurgy -- Periodicals; 620.1105
• DOI: 10.1080/02670836.2015.1114739
• Languages: English
• ISSNs: 0267-0836

Abstract

Abstract : Fatigue cracks in titanium alloys are often found to initiate at faceted alpha grains. In the very high cycle fatigue regime, crack initiation tends to shift from the surface towards the interior of the material, and more initiation facets can be found on the fracture surface. In this study, fatigue tests were performed on drawn and heat-treated Ti–6Al–4V wires. Only a few samples fractured due to interior initiation. The facets at the initiation sites of these samples were not flat, but had markings on the nano-scale, and were highly inclined. A possible explanation for these aspects is the crystallographic texture of the wire, and a reflection is made on the suggested mechanisms of facet formation. This paper is part of a Themed Issue on Euromech 570: Interface-dominated materials.