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Abstract
Selective laser melting (SLM) has great potential in additive manufacturing because it enables the production of full-density complex parts with the desired inner structure and surface morphology. High temperature gradients as a result of the locally concentrated energy input lead to residual stresses, crack formation and part deformation during processing or after separation from the supports and the substrate. In this study, an X-ray diffraction technique and numerical simulation were used for investigating the residual stress in SLM samples fabricated from stainless steel 316L and Ti6Al4V alloy. Conclusions regarding directions and values of stresses in SLM objects are given.
Acknowledgements
This work benefited from the cooperation between the Central University of Technology, Free State and Nelson Mandela Metropolitan University (NMMU). Authors would like to acknowledge Director of eNtsa NMMU Prof. D.Hattingh for his help and wish to express their thanks to S. Grewar and R. Brown from NMMU for performing the XRD measurements.
Disclosure statement
No potential conflict of interest was reported by the authors.