Effect of energy density on quasi-static and dynamic mechanical properties of Ti–6Al–4V alloy additive-manufactured by selective laser melting

A selective laser melting (SLM) technique, which employs a high laser power as its heat source, was used to additively manufacture a Ti–6Al–4V alloy effectively. SLM process can inevitably cause various defects in the products due to the rapid melting and solidification of metal powder. The key fact...

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Bibliographic Details
Published in:Journal of materials science 2022-10, Vol.57 (38), p.18014-18024
Main Authors: Jang, Ji-Hoon, Choi, Youngsin, Jung, Kyung-Hwan, Kim, Hyung-Giun, Lee, Dong-Geun
Format: Article
Language:English
Subjects:
3D printing
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Crack propagation
Crystallography and Scattering Methods
Defects
Dynamic mechanical properties
Fatigue
Fatigue failure
Fatigue strength
Fatigue testing machines
Heat treating
High cycle fatigue
Hot isostatic pressing
Innovation in Materials Processing
Laser beam melting
Lasers
Martensite
Materials
Materials Science
Mechanical properties
Metal powders
Metal products
Microstructure
Polymer Sciences
Powders
Rapid prototyping
Solid Mechanics
Solidification
Specialty metals industry
Specific gravity
Titanium
Titanium base alloys
Titanium industry
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Summary:A selective laser melting (SLM) technique, which employs a high laser power as its heat source, was used to additively manufacture a Ti–6Al–4V alloy effectively. SLM process can inevitably cause various defects in the products due to the rapid melting and solidification of metal powder. The key factors that affect the dynamic properties of additive manufacturing products using titanium powders may differ from the factors that affect quasi-static properties. This study aimed to control defects such as pores, unmelted powders, and lack of fusion by changing the energy density among the SLM process conditions. The changes in texture and volume fraction of the irregular and regular regions were analyzed according to the energy density. The acicular α ′ martensite fraction increased as the energy density increased, and the quasi-static mechanical properties could be improved by forming Widmanstätten microstructure with relatively random orientations after an additional hot isostatic pressing treatment. The SLM-fabricated Ti–6Al–4V alloy showed very high cycle fatigue strength (714 MPa), which was an excellent dynamic fatigue property compared to the existing wrought Ti–6Al–4V alloy, by improving resistance to fatigue crack propagation by irregularly oriented microstructure.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-022-07205-9