| Abstrakt: |
SAF 2507, a superduplex stainless steel, combines mechanical strength with high corrosion resistance. As a powder, it can be used in conjunction with the laser cladding deposition process (LCD), restoring damaged components by erosion and improving their properties, regarding surface hardness and resistance to corrosive environments. In the current study, a SAF 2507 powder was employed to fabricate various multi-pass clads on an austenitic 316 L substrate via laser cladding deposition (LCD). Specimens were later subjected to heat treatment procedures, in order to restore the phase balance ratio. The attained microstructures were observed through light optical and scanning electron microscopy (LOM and SEM), coupled with energy-dispersive spectroscopy (EDS) analysis. Vickers hardness tests were also conducted in order to evaluate the hardness of every clad layer. Finally, X-Ray Diffraction (XRD) was employed in order to ascertain the experimental results, as well as investigate the existence of undesirable phases. While a mostly ferritic microstructure was anticipated after the LCD process, the resulting clads were characterized by a relatively balanced phase ratio, with austenite being the dominant phase instead. After heat-treating, further austenite growth occurred, leading to an overall decrease in hardness, although nitrides that had precipitated during the deposition were no were no longer present. [ABSTRACT FROM AUTHOR] |
