Effects of Loading Rate Range on Mechanical and Microstructural Properties of Dynamically Compacted Iron Powder

다국어 초록 (Multilingual Abstract)

In this paper, an attempt was made to investigate the effects of dynamic loading rate on the properties of iron powder with afocus on the microstructural characteristics of the compacted material. Dynamic compaction tests were performed using aninstrumented die equipped with a load cell under the low loading rate ranging from 20 to 44 kN/ms in a drop hammer and thehigh loading rate ranging from 308 to 665 kN/ms in a one-stage light gas gun. Optical and scanning electron microscopes,diametric compression test, and Vickers hardness measurement were used to investigate microstructural and mechanicalproperties of the green compacts. The obtained results show that the range of loading rate completely changes the behavior ofthe powder by changing the number and velocity of the propagating stress waves. Comparison of the properties of specimenswith equivalent density compacted under two ranges of loading rates indicates that the high range significantly increasesthe strength and hardness, distributes stress and porosity more uniformly, and reduces initiation and growth of inter-particlecracks as well as the compaction force required to achieve a specific density.

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