Abstract
This study investigates the influence of quantity of tungsten powder on the
microstructural evolution of 17-4 PH stainless steel-tungsten composite produced
using laser metal deposition process. The 17-4 PH stainless steel and tungsten
powders were deposited on 316 stainless steel substrate at laser power of 2600 W.
The tungsten powder flow rate was varied between 0.5 rpm and 2.0 rpm while 17-4
PH stainless steel powder flow rate, the scanning speed, the gas flow rate and the
laser spot size were fixed at 2.0 rpm, 0.5 m/s, 2.5 l/min and 2.0 mm respectively. Five
(5) multiple track of 17-4 PH stainless steel and tungsten powder were deposited on
316 stainless steel of thickness 10 mm from different hopper at 50% overlapping
percentage to produce 17-4 PH SS-W composite. During the microstructural study, it
was observed that tungsten carbide has been precipitated in-situ and evenly dispersed
in the 17-4 PH SS-W composite produced. SEM and EDS analysis also revealed the
presence of BCC alpha (α) ferrite and FCC gamma (δ) ferrite with the presence of
sigma (σ) phase precipitates.