Experimental Optimization of Blended Powder Semisolid Forming Parameters for Production of 316L Stainless Steel Nanocomposites Reinforced with Al2O3np

Taguchi method was employed to investigate the influence of blended powder semisolid forming (BPSF) factors on the porosity and hardness of 316L matrix nanocomposites. These factors included the particle size (316L and Al 2 O 3 ), Al 2 O 3 weight fraction, and blending time. 316L/Al 2 O 3 powders were added to ethanol solution and subjected to ultrasonic homogenization. Subsequently, the powders were blended using a planetary ball mill. Cold compaction was performed under 800 MPa pressure. Semisolid sintering process was conducted in 1440°C. Powder morphology, microstructure, and phase formation were investigated. The particle size of the matrix and mechanical blending time have the greatest impact on the porosity, while the reinforcing particle size and weight fraction of reinforcing material have the least influence on the porosity. As for hardness, the matrix particle size was identified as the most significant factor, followed by the reinforcing weight fraction and mechanical blending time. The reinforcing particle size exhibited the least effect on the hardness. Successful distribution and dispersion of nanoparticles within matrix were achieved in optimized samples. The results introduce BPSF as a promising method in developing high performance 316L matrix nanocomposites.