Selective laser melting of Ti6Al4V alloy: Effect of post-processing on fatigue life, residual stress, microstructure, microhardness and surface roughness

Simple item page
dc.contributor.authorÖnder S.
dc.contributor.authorSaklakoğlu N.
dc.contributor.authorSever A.
dc.date.accessioned2024-07-22T08:03:02Z
dc.date.available2024-07-22T08:03:02Z
dc.date.issued2023
dc.description.abstractIn this study; turning, milling, heat treatment and shot peening (SP) post-process operations alone or in different combinations were performed on Ti6Al4V specimens which were produced by selective laser melting (SLM); then the effects of these operations on the fatigue life, residual stress, microstructure, microhardness and surface roughness were investigated. SP processes were carried out in two different types, traditional and multiple, and it was observed that the multiple SP process, which was carried out with the same almen intensity as traditional, with a smaller ball diameter, was effective in reducing the surface roughness. As a result of the heat treatment, α + β transformation was observed in the microstructure. α phase was seen in both lamellar and globular forms. Traditional SP and multiple SP processes provided a significant increase in microhardness values in the 0–250 μm depth range. A significant decrease in the microhardness values of the heat-treated specimens was observed due to the α + β transformation in the microstructure. Traditional SP and multiple SP processes enabled the residual stress type to become compressive type in both the x-axis and the y-axis in the 0–150 μm depth which is a very critical region for fatigue cracks despite the x-axis direction surface unmachined. Fatigue test were performed on machined, multiple shot-peened and machined after heat-treated specimens. The best results in terms of fatigue strength were obtained in the specimens that were heat-treated. It was observed that the most important cause of fatigue crack initiation in multiple shot-peened specimens was an internal defect located deeper than 250 μm. Fisheye formation was observed on fracture surfaces of some multiple shot-peened fatigue specimens. © 2022 Elsevier Inc.
dc.identifier.DOI-ID10.1016/j.matchar.2022.112571
dc.identifier.issn10445803
dc.identifier.urihttp://akademikarsiv.cbu.edu.tr:4000/handle/123456789/12074
dc.language.isoEnglish
dc.publisherElsevier Inc.
dc.subjectAluminum alloys
dc.subjectFatigue crack propagation
dc.subjectFatigue testing
dc.subjectHeat treatment
dc.subjectMelting
dc.subjectMicrohardness
dc.subjectMicrostructure
dc.subjectResidual stresses
dc.subjectSelective laser melting
dc.subjectSurface roughness
dc.subjectTernary alloys
dc.subjectTitanium alloys
dc.subjectAlloy effect
dc.subjectHeat-treated specimens
dc.subjectMultiple shot peening
dc.subjectPost process
dc.subjectPost-processing
dc.subjectProcess operation
dc.subjectSelective laser melting
dc.subjectShot-peening
dc.subjectTi-6Al-4V alloy
dc.subjectβ transformation
dc.subjectShot peening
dc.titleSelective laser melting of Ti6Al4V alloy: Effect of post-processing on fatigue life, residual stress, microstructure, microhardness and surface roughness
dc.typeArticle

Files

Collections

Scopus Koleksiyonu