The effect of scan speed and hatch distance on prior-beta grain size in laser powder bed fused Ti-6Al-4V

dc.contributor.authorLouw, D.F.
dc.contributor.authorPistorius, Pieter Georg Hendrik
dc.date.accessioned2019-12-09T10:11:58Z
dc.date.issued2019-08
dc.description.abstractTi-6Al-4V produced by laser powder bed fusion can achieve mechanical properties similar to its wrought counterpart if an appropriate post-process heat treatment is applied. The response of the material to post-process heat treatment depends on the prior-beta grain size in the as-built condition. The current article illustrates that a reduction in hatch distance can cause coarsening of prior-beta grains due to retained heat that reduces the cooling rate. On the other hand, an increase in scan speed refines prior-beta grains. Unfortunately, an increase in scan speed has to be accompanied by a reduction in hatch distance to prevent an increase in porosity and the potential grain refinement is then cancelled out. The use of a faster scan speed in combination with a smaller hatch distance significantly improves roughness of the top surface. EBSD in combination with reconstruction of prior-beta grains is an effective technique to quantify prior-beta grain size. Furthermore, the use of Rosenthal’s equations allows quick calculation of cooling rate that can be used to predict the dependence of prior-beta grain size on process parameters.en_ZA
dc.description.departmentMaterials Science and Metallurgical Engineeringen_ZA
dc.description.embargo2020-04-18
dc.description.librarianhj2019en_ZA
dc.description.sponsorshipSouth Africa’s Department of Science and Technology through the Collaborative Program in Additive Manufacturing.en_ZA
dc.description.urihttp://link.springer.com/journal/170en_ZA
dc.identifier.citationLouw, D.F. & Pistorius, P.G.H. The effect of scan speed and hatch distance on prior-beta grain size in laser powder bed fused Ti-6Al-4V. International Journal of Advanced Manufacturing Technology (2019) 103: 2277-2286 https://doi.org/10.1007/s00170-019-03719-w.en_ZA
dc.identifier.issn0268-3768 (print)
dc.identifier.issn1433-3015 (online)
dc.identifier.other10.1007/s00170-019-03719-w
dc.identifier.urihttp://hdl.handle.net/2263/72548
dc.language.isoenen_ZA
dc.publisherSpringeren_ZA
dc.rights© Springer-Verlag London Ltd., part of Springer Nature 2019. The original publication is available at : http://link.springer.comjournal/170.en_ZA
dc.subjectTitanium metallurgyen_ZA
dc.subjectSelective laser meltingen_ZA
dc.subjectAdditive manufacturingen_ZA
dc.subjectLaser powder bed fusion (LPBF)en_ZA
dc.subject.otherEngineering, built environment and information technology articles SDG-04
dc.subject.otherSDG-04: Quality education
dc.subject.otherEngineering, built environment and information technology articles SDG-09
dc.subject.otherSDG-09: Industry, innovation and infrastructure
dc.subject.otherEngineering, built environment and information technology articles SDG-12
dc.subject.otherSDG-12: Responsible consumption and production
dc.subject.otherEngineering, built environment and information technology articles SDG-13
dc.subject.otherSDG-13: Climate action
dc.titleThe effect of scan speed and hatch distance on prior-beta grain size in laser powder bed fused Ti-6Al-4Ven_ZA
dc.typePostprint Articleen_ZA

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