Abstract
Abstract Rapidly solidified high alloy steel powders with boron contents up to 4.2wt.% and particle sizes of less than 80 μm have been produced by argon melt atomization. The microstructure consists of metastable and stable borides with dendritic or complex shapes within the α- or γ-solid solution matrix. After consolidation by extrusion the materials exhibit a fine-grained equiaxed microstructure with grain sizes of less than 5 μm. These particle-reinforced ultrahigh boron steels reveal superior elastic and strength properties at room and elevated temperature. In addition, structural superplasticity with large elongation to failure ( > 500%) occurs at higher temperatures of about 1000°C. This is due to grain boundary sliding accommodated by lattice and grain boundary diffusion.
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