Abstract
Austenitic stainless steel is one of the most common classes of metallic alloys sintered by powder metallurgy processing routes. However, the uncontrolled grain growth induced by the temperature used in conventional sintering must be avoided. The increase in specific surface together with the decrease in particle/grain size accelerates the kinetics of grain growth. Dynamic densification is a physical process in which the energy is transmitted to the powder at high pressure during an extremely reduced time period, which leads to interparticle bonding without significant thermal effects.In this study nanocrystalline stainless steel powders were densified by explosives and compared with microcrystalline powder. Nanocrystalline stainless steel powders were produced by mechanical milling and sputtering. In both cases, the densification by explosive composition with a detonation velocity of 4mm/μs leads to the formation of nanocrystalline bulk stainless steel, with the same chemical and structural compositions as the starting powders.
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