What question did this study set out to answer?

March 27, 2026Materials1 citationsOpen Access

Improvement of the Surface Layer Properties of 316L Stainless Steel Produced by DMLS Through the Use of a Shot Peening Process

KDK. DudekRzeszów University of Technology DGDominika GrygierWrocław University of Science and Technology LGLidia GałdaRzeszów University of Technology

Key Points

This study aims to improve the surface layer properties of 316L stainless steel produced by DMLS through shot peening.
Applied milling and shot peening to the stainless steel samples.
Used a full factorial design 32 to optimize shot peening parameters.
Analyzed surface topography and residual stresses before and after treatments.
Conducted microstructure observations and statistical analyses.
Milling reduced surface topography parameters but increased tensile residual stresses.
Shot peening resulted in reduced surface topography and created favorable compressive residual stresses.
The changes in surface properties were linked to microstructural alterations.

Abstract

Additive-manufactured (AM) 316L stainless steel, produced via direct metal laser sintering (DMLS) and characterised by a surface topography of high irregularities and tensile residual stresses with specific anisotropy, was subjected to milling and shot peening. The milling process caused a reduction in surface topography parameters, but tensile residual stresses increased significantly. The shot peening process was carried out according to the full factorial design 32 and technological parameters such as a shot diameter in the range of 1-3 mm and an air supply pressure between 0.2 and 0.6 MPa. As a result of the experiments and the analysis, reduced surface topography was achieved, and a favourable residual stress state was formed with compressive stresses. The mechanism of the changes was demonstrated via microstructure observation and statistical models obtained by mathematical analysis.

问 AI

Bookmark

View Full Paper