粉末ハイスの新鍛造技術
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In general, P/M high speed steels are manufactured through the powder consolidation process of CIP and/or HIP finally followed by hot-forging, -rolling, -extrusion or other working routes. A new P/M forging process to consolidate a powder filled container into a billet is presented here.This direct hot-forging (HIP less) was carried out using a rotary forging machine, after conditioned by the results of physical simulation using plasticine.Results obtained are as follows.(1) Density of center ρ is directly proportional to the sum of mean compressive stress. ρ∝∑σm2(=N×∑σm2/N), where σm2 is mean compressive stress and N is a number of hammering.(2) N is inversely proportional to passing velocity V.(3) The sum of mean compressive stress per hammering is directly proportional to deformation area ΔS.(4) Effect of passing velocity: ΔS increases with increasing passing velocity and simultaneously N decreases, so a suitable passing velocity for consolidation has to be selected.(5) Effect of relief die angle: Consolaint ratio α is directly proportional to relief die angle.(6) Effect of consolaint ratio: In the case of ΔS=const., at α≥65%; ∑σm2/N=const. at α<65%; ∑σm2/N decreases with decreasing α.(7) 8% Co high speed steel powder was consolidated into a preform by the new forging method, followed by the rolling of the preform. The conditions were offered by the above simulation results. The properties of the final billet were nearly equal to those of conventional P/M high speed steels.
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