Optimization of squeeze casting process parameters on mechanical properties of SiCp reinforced LM25 composites through Taguchi technique

Abstract

Aim of the present work focuses with influence of processing parameters on fabricated composites of LM25 alloy with SiC particles reinforcement through the squeeze casting technique. The following process parameters like stirring speed from 550 to 750 rpm, SiC weight proportions from 4 to 8% and melting temperature from 600 to 700oC were employed. Then processed composites were subjected to microstructural analysis and mechanical tests to ascertain metallurgical and mechanical properties. SEM and EDS results confirmed that the better bonding of SiC particles with matrix is achieved in the LM 25 composites and it is due to homogeneous dispersion of SiC particles in the stir casting process. The maximum tensile strength (211 MPa) and hardness (91 Hv) is achieved on the composite samples with processing parameters of 750 rpm stirring speed, 8% of SiC proportions and 650 0C of melting temperature, respectively. From the design of experiment by Taguchi method, it is found that the stirring speed plays an important role in achieving better distribution of SiC particles in the composite samples than that of other parameters like SiC weight ratios and melting temperature of the alloy.