Cavitation erosion and corrosion behaviors of stainless steel 316 laser surface-alloyed with WC

摘要: Fine WC powder was preplaced on stainless steel 316 by pasting and processed with a high power CW Nd-YAG laser to achieve surface alloying. The composition microstructure of the alloyed layer phases formed were investigated EDS, SEM, XRD respectively. cavitation erosion corrosion behaviors samples in 3.5% NaCl solution studied vibratory test potentiodynamic polarization test. Under favorable processing conditions, resistance sample could reach more than 30 times that as-received 316. On other hand, general deteriorated. improvement be attributed increase W solid precipitation fine carbides, both resulting from dissolution during processing. decrease originated weakening passive film because some Cr precipitated out form metal carbides.Fine precipi...