Abstract
The deformation characteristics during open-die forging of silicon carbide particulate reinforced aluminium metal matrix composites (SiCp AMC) at cold conditions are investigated. The material was fabricated by liquid stir casting method in which preheated SiC particles were mixed with molten LM6 aluminium casting alloy and casted in the silicon mould. Finally, preforms obtained were machined in required dimensions. Two separate cases of deformation, that is, open-die forging of solid disc and solid rectangular preforms, were considered. Both upper bound theoretical analysis and experimental investigations were performed followed by finite element simulation using DEFORM, considering composite interfacial friction law, barreling of preform vertical sides, and inertia effects, that is, effect of die velocity on various deformation characteristics like effective stress, strain, strain rate, forging load, energy dissipations, and height reduction. Results have been presented graphically and critically investigated to evaluate the concurrence among theoretical, experimental, and finite element based computational findings.
Highlights
Metal matrix composite (MMC) as hybrid materials has attracted attention of many researchers in recent years
Though Singh et al, Jha et al, and Chandrasekhar et al [21,22,23] reported the analysis of dynamic effects during open-die forging of sintered materials, no work has been reported to analyze these effects, that is, effect of die velocity on various deformation characteristics during mechanical processing of metal matrix composites
This continues till cracks start appearing on the outer surfaces of preforms, that is, maximum forgeability of preforms. In both axisymmetric and plane strain deformations, the height reduction for preforms having 5 wt% SiCp is found to be more as compared to 13 wt% SiCp preforms, which indicates that the percentage of increase in SiCp decreases the forgeability of preforms
Summary
Metal matrix composite (MMC) as hybrid materials has attracted attention of many researchers in recent years. The present paper is an attempt to investigate the various deformation characteristics during open-die forging of SiCp reinforced aluminium metal matrix composites (AMC). The combination of forging and extrusion process on SiCp/AZ91 magnesium matrix composites fabricated by stir casting technology and investigated the effect of deformation characteristics on the yield stress and ultimate tensile strength of material by Wu et al [18]. Though Singh et al, Jha et al, and Chandrasekhar et al [21,22,23] reported the analysis of dynamic effects during open-die forging of sintered materials, no work has been reported to analyze these effects, that is, effect of die velocity on various deformation characteristics during mechanical processing of metal matrix composites.
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