Experimental investigation of selective laser melting parameters for higher surface quality and microhardness properties: taguchi and super ranking concept approaches

In the current study, near net-shaped selective laser melting (SLM) technology was employed to build nickel-based superalloy Inconel 625 (IN625) parts with good quality. Taguchi method formulate a systematical analyze, and optimize influencing factors, i.e., power (LP), scan speed (SS) hatch distance (HD) on resulting micro-hardness (MH) surface roughness (SR) of samples. Scanning electron microscope (SEM) X-ray diffraction analysis were carried out characterize powder morphology (spherical shaped particle possessing size 35 ± 6 ?m) Laser most contributing factor analyzed parameters (MH SR), followed by scanning distance. determined optimal condition (MH: LP = 270 W, SS 800 mm/s, HD 0.08 mm; SR: mm) which resulted in higher microhardness 416 HV lower 2.82 ?m. Higher MH attributed minimal porosity, while uniform smooth samples low SR as evident from SEM images texture analysis. Super ranking concept (SRC) used simultaneously, determining single (LP 300 600 0.10 mm). The obtained 382 HV, 3.92 results conditions are validated subjected morphologies.