Additively Manufactured 316L Stainless Steel Subjected to a Duplex Peening-PVD Coating Treatment

Abstract

This research studies the individual and combined effects of mechanical shot peening and the deposition of TiAlCuN coating on additively manufactured 316L stainless steel. Shot peening has been found to induce a 40% increase in surface hardness, while the combined effect of shot peening and the coating produced an approximately three-fold increase in surface hardness when compared to the as-printed coupons. Shot peening reduced the surface roughness of printed metal coupons by 50%, showing that shot peening can also serve to improve the surface finish of as-printed 316L stainless steel components. The peening process was found to induce a compressive residual stress of 589 MPa, with a maximum affected depth of approximately 200 μm. Scratch testing of the printed and coated specimens showed complete delamination failure at a normal load of 14 N, when compared to hybrid treated samples which failed at 10 N. On the other hand, from the corrosion tests, it was found that the hybrid treated samples provided the optimal results as opposed to the other variables.

Nanostructured TiAlCuN and TiAlCuCN coatings for spacecraft: effects of reactive magnetron deposition regimes and compositions

“…The possibility of this was described in earlier works. 26,27 The calculated lattice parameters were a = 4.207 Å and a = 4.2268 Å for TiAlCuN and TiAlCuCN coatings, respectively. In both cases, it is less than a = 4.241 Å for pure titanium nitride and about the same value as for TiAlN coatings.…”

“…There is very little information in the literature concerning the TiAlCuN coating. 19–21,26,27 Moreover, no information was detected about the carbonitride variation of this composition – TiAlCuCN coating. In this regard, the study of these fundamentally new coatings and the accumulation of experimental data on them is an urgent task.…”

Overview of Surface Modification Strategies for Improving the Properties of Metastable Austenitic Stainless Steels

“…Combining different surface modification techniques can achieve synergistic effects that can lead to even greater improvements in the material's mechanical properties. For example, SP and physical vapor deposition (PVD) coating are two common surface modification techniques used to improve the mechanical properties of MASS [200,201]. SP can induce compressive residual stresses and plastic deformation, while PVD coating can modify the surface chemistry and alter the microstructure.…”