Microstructure and mechanical deformation behavior of selective laser melted Ti6Al4V ELI alloy porous structures

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TitreMicrostructure and mechanical deformation behavior of selective laser melted Ti6Al4V ELI alloy porous structures
Type de publicationJournal Article
Year of Publication2020
AuteursChang C, Huang J, Yan X, Li Q, Liu M, Deng S, Gardan J, Bolot R, Chemkhi M, Liao H
JournalMATERIALS LETTERS
Volume277
Pagination128366
Date PublishedOCT 15
Type of ArticleArticle
ISSN0167-577X
Mots-clésDeformation behavior, Microstructure, Octahedral, SLM, Ti6Al4V
Résumé

{In the present work, microstructure, compressive properties and deformation behavior of selective laser melted (SLM) Ti6Al4V ELI porous structures were studied. After analyzing the phase composition and microstructure characteristics, a number of fine acicular a' martensite (93.3%) and a bit b phase (6.6%) can be detected in SLM porous structures. Based on the experimental results and analyses, it can be found that when the porosity is constant, the yield strength of the SLM porous structure increases with increasing pore diameter. However, as the porosity increases, the mechanical properties of the SLM porous structures deteriorated. Of the SLM porous samples studied presently, those with porosity of 60% and pore diameter of 800 mu m have the best compressive yield strength. Moreover, the relative density (d) of the SLM porous structures plays a vital role on the compressive properties (sigma, MPa) of the SLM porous structures. The relationship between the SLM solid sample and the SLM porous sample can be established using the equation, i.e.

DOI10.1016/j.matlet.2020.128366