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

Font Size: 
RESIDUAL STRESSES AND DISTORTIONS IN SELECTIVE LASER MELTING – A REVIEW
Lameck Mugwagwa, Dimitri Dimitrov, Stephen Matope, Rumbidzai Muvunzi

Last modified: 2016-10-11

Abstract


One of the major setbacks in laser based metal Additive Manufacturing (AM) processes is the occurrence of residual stresses. These stresses are known to compromise the mechanical performance, form and dimensional accuracy of finished parts. Although residual stresses are associated with most manufacturing processes, their magnitude and effects are more pronounced in thermal processes such as welding, casting, electron beam and laser beam melting processes where steep temperature gradients are usually experienced. This paper presents a comprehensive literature survey on the occurrence of residual stresses in Selective Laser Melting (SLM), a process dedicated for AM of metallic components. The mechanisms of residual stresses are presented, together with a parametric study to understand the causes and effects of these residual stresses on the quality and performance of parts built using SLM. An analysis of methods to manage residual stresses is also presented. Case studies from literature are used to compare the techno-economic relevance of the different techniques used to control residual stresses in parts built from SLM. This paper presents important research opportunities around parametric study of the SLM process with regards to residual stresses, form and dimensional distortions.

 

Keywords

Selective Laser Melting, residual stresses, distortions.


Keywords


Selective Laser Melting, Residual Stresses, Distortions