210 Utilization of Powder Microstructure to Strengthening of Fe-Cu Alloy from Rapidly Solidified Powder

概要

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The strengthening mechanism of Fe-Cu alloy from rapidly solidified powder was investigated. The powder microstructure was changed by annealing. The as-atomized and annealed powders were consolidated by groove rolling at a warm temperature in order to avoid recystallization and to maintain the powder microstructure. Copper was precipitated in ferrite matrix and at primary powder boundaries in any of the consolidated samples; the precipitation was coarser in the samples from the annealed powders. The results of the tensile testing showed strengthening occurred by copper addition in both samples; the magnitude of the strengthening was larger in the samples from the as-atomized powder. The minute and uniform copper distribution in the samples from the as-atomized powder results in larger strengthening effect.
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