Unexpected erosion-corrosion behaviour of 316L stainless steel produced by selective laser melting

Pitting corrosion of 17-4PH stainless steel manufactured by laser beam melting

“…Therefore, even though our work confirmed the detrimental effect of lack-of-fusion pores on the pitting resistance of the SS, there was no significant effect of those defects on the stable pitting behaviour of the LBM MSS studied here due to a very low amount of those defects. Such a conclusion was in agreement with the literature who showed an improvement in pitting corrosion resistance for a SLMproduced 316 L SS as compared to a commercial counterpart [40,42]. The authors explained the results by the elimination, or the refinement of MnS inclusions in the SLM samples, whereas no influence of pores was observed on the pitting corrosion behaviour of the SLM samples due to their very low amount (a few small gas pores but no lack-offusion pores).…”

“…Only very few lack-of-fusion pores could be found; they were bigger than gas pores (around 10 μm). This showed that optimised parameters for the LBM process allowed samples of very high density to be produced, in agreement with Laleh's results [42]. The XRD patterns plotted for both wrought and LBM MSSs are shown in Fig.…”

An Overview of Major Experimental Methods and Apparatus for Measuring and Investigating Erosion-Corrosion of Ferrous-Based Steels

“…The corrosion metal loss can be calculated from the integrated anodic charge, and the total metal loss can be measured from the weight loss of the same test sample. Anodic potentiostatic polarization is normally used to study the erosion-corrosion behavior of passive steels [15,38,42,70,[93][94][95][96][97][98][99][100]. The corrosion metal loss of the passive steel is always induced by the sand impingements, leading to local breakdown of the passive film.…”

“…Since it was verified in previous studies that higher concentrations of Cr and Mo would facilitate the repassivation process and the addition of Ni would retard the restoration of the passive film, the different erosion-corrosion resistances of the stainless steels indicate that repassivation is an important factor for the initiation of erosion-corrosion on passivated steels. Laleh and co-workers [100] compared the erosion-corrosion behaviors of commercial 316L stainless steel and selective laser melting (SLM)-produced 316L stainless steel. The basic chemical compositions of both 316L stainless steels were similar except that MnS inclusions were eliminated from the SLM-produced 316L samples.…”

“…Potentiodynamic polarization curves for commercial and selective laser melting (SLM)-produced 316L SS, recorded in 0.6 M NaCl solution (a), and the erosion-corrosion performance of commercial and SLM-produced 316L SS under +100 mV anodic polarization in slurries with different flow rates (b)[100], adapted from[100], with permission from Elsevier, 2019.…”