Abstract
Selective Laser Melting (SLM) is a near net shaped additive manufacturing process. Parts processed by SLM can experience dynamic loading and high temperature in service, in applications such as defence, aerospace, automotive and high-speed machining. This study investigates the dynamic behaviour of SLM-processed and heat treated eutectic AlSi12 alloy under compression. The dynamic high strain rate experiments were carried out in the range of 1 × 103 to 2 × 103 /s using the split Hopkinson pressure bar (SHPB) equipment. A significant reduction in dynamic yield strength and ultimate compressive strength was observed when the as-built AlSi12 samples were tested at elevated temperatures (200 °C and 400 °C). Moreover, the dynamic flow stress was found to decrease with the increase in temperature at which the samples were heat treated prior to testing. This reduction in flow stress was attributed to the softening of the samples due to the agglomeration and growth of Si-rich precipitates at increased temperatures. The deformation behaviour of dynamically tested AlSi12 samples were also investigated for ellipticity with respect to elevated temperatures, heat treatment and different strain rates.
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