High-temperature shock consolidation of high-speed steel powders using converging underwater shock wave

摘要

We attempted to consolidate high-speed steel powders with a high-temperature shock compression apparatus using converging underwater shock waves. The effects of experimental temperature and particle size were verified through a series of experiments, and the melting ratio generated due to heating by plastic deformation of particle surfaces was investigated. Normally, the melting ratio was increased by increasing the experimental temperature and particle size, which was explained by the consideration of how much energy from the shock waves was absorbed by melting the particle surfaces. High temperature experiments above 800 ℃ showed decreases in the melting ratio, which was due to a softening of the high-speed steel powders at high temperatures. A decrease in thermal residual stress and an increase in ductility of the powders caused a number of cracks generated in the consolidated sample to disappear upon heating of the powders.