Abstract
Explosive consolidation of the rapidly-solidified nickel-base super-alloy powder IN 718 was successfully accomplished. The effects of explosive type, explosive-to-powder mass ratio, powder container material and thickness, type of confinement, shielding material, and preheating temperature were investigated. Conditions for satisfactory consolidation, with good mechanical properties and low microcrack density, were established. The best consolidation was achieved by using a double-tube design in which a flyer tube was explosively accelerated, impacting the (cylindrical) powder container. The powder was pre-heated at 525° C and the initial consolidation pressure was calculated to be 18 GPa, resulting in approximately 20% apparent interparticle melting (white-etching regions between particles). The quality of the consolidates was evaluated by optical and electron microscopy, and by tensile testing.[/p]
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