Open AccessHeterogeneity of microstructure, texture and mechanical properties along the building direction of Ti-6Al-4V alloy developed by SLM
Author(s) -
Caroline Widomski,
Denis Solas,
Thierry Baudin,
François Brisset,
Sébastien Lebel,
A-L Helbert
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1121/1/012031
Subject(s) - microstructure , materials science , selective laser melting , texture (cosmology) , alloy , titanium alloy , martensite , homogeneous , grain size , composite material , metallurgy , image (mathematics) , physics , artificial intelligence , computer science , thermodynamics
Selective Laser Melting (SLM) is of great interest to the aerospace industry due to its ability for producing components with complex geometries. The laser melting process induces a high cooling rate (105-107 K/s) and a germination by epitaxy which leads to a columnar microstructure. In the case of Ti-6Al-4V the rate of cooling from the β domain generates a martensitic α’ structure made up of fine needles. The present work describes the microstructural, textural and mechanical heterogeneities along the building direction of Ti-6Al-4V samples produced by SLM with two strategies that have different melt pool size. Characterizations show that both strategies lead to a martensitic microstructure but only the SLM with the greater melting area allows to get homogeneous hardness, texture and β grain size (reconstructed by ARPGE) along building direction.