Abstract
? 2022 The Author(s)Demand for new Ti alloys for AM is immense. Ti–5Al–5Mo–5V–3Cr (wt%), a β type Ti alloy is chosen for this study as it possesses excellent properties. Samples are manufactured using SLM technique. Relative density, surface morphologies and hardness of samples produced by varying laser processing parameters, e.g., laser scan speed and laser power, are thoroughly investigated. Top surface of the as-built samples shows adhered powder particles and discontinuous ripple patterns. A change in scan speed from 1200 to 1400 mm.s-1 drastically deteriorates top surface quality in terms of ripples patterns and adhered powders. Surface roughness (Sa/Ra) of the side surface of the produced samples shows a value of below 20 μm. Side surfaces show adhered powder particles, open surface pores, microcrack and interlayer crack. Substantial increase in adhered powder particles is evident when both laser power and laser scan speed are increased distinctively. These results are discussed with the help of the thermodynamic and metallurgical phenomena involved in the SLM processing. Hardness of the as-built samples is measured, the value is in agreement with conventional processing. This fundamental study will be useful for producing Ti-5553 alloy AM parts with optimum surface.
NSTL
Elsevier