SUNConferences, 17th Annual Conference of the Rapid Product Development Association of South Africa

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Testing for homogeneity and orthotropy of Ti6Al4V (ELI) parts built by Direct Metal Laser Sintering
LERATA BOTSANE MALEFANE, Du Preez Willie, Maringa Maina

Last modified: 2016-10-27

Abstract


Design of medical prostheses is typically based on the mechanical properties of the materials used. However, apart from non-loadbearing implants, medical prostheses in use are exposed to various forms of dynamic loading. Therefore, to eventually deliver qualified medical prostheses produced through additive manufacturing (AM), it is necessary to develop a data bank on both their static and dynamic properties. This is done here with reference to the fatigue properties of Direct Metal Laser Sintering (DMLS) of Ti6Al4V (ELI) parts, produced at the Centre for Rapid Prototyping and Manufacturing (CRPM) of the Central University of Technology. In recognition of the effect of microstructure on the mechanical properties of materials, post process heat treatment of Ti6Al4V (ELI) will also be done to produce prostheses with high fatigue strength.

 

Rectangular bars of Ti6Al4V (ELI) of dimensions 60 x 11 x 11 mm were built in the X, Y and Z directions in the DMLS machine. Ultrasonic testing was undertaken on each specimen to determine its heterogeneity and orthotropy.

 

This paper presents the results obtained from the ultrasonic tests of as-built DMLS Ti6Al4V (ELI), without post production stress relief or heat treatment.


Keywords


DMLS of Ti6Al4V (ELI), heterogeneity, orthotropy, ultrasonic testing