Investigating the residual stress in additive manufacturing of repair work by directed energy deposition process on SS316L hot rolled steel substrate

Abstract The aim of this research is to conduct a systematic investigation of the directed energy deposition of stainless steel 316L powder in order to evaluate and investigate residual stresses caused by the laser deposition process. In metal additive manufacturing, predicting residual stress is critical for ensuring the quality of the fabricated part. Stainless steel 316L cubes were prepared by directed energy deposition process on hot rolled steel substrate for the repair work purpose. To evaluate the effect of the residual stress of sandwich samples, which can be compressive or tensile. Also, to investigate the residual stresses developed on the interface region for between the directed energy deposition, and hot rolled steel sample. Finally, it is found that the residual stresses on the hot rolled steel surfaces in the compressive stress (-855 MPa), on other hand compressive stress has obtained in the directed energy deposition surface (-822 MPa). The residual stresses were determined experimentally using X-Ray Diffraction (XRD) residual stress measurements.