拡散合金用副原料粉末の試作研究

概要

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An investigation was made on high-alloy fine powders-to build up specific hybrid powders with iron core powders-which were produced Ni, Mo, Cr etc-concentrated by high-pressure water atomization.The results obtained of these hybrid powders are as follows:(1) All the hybrid powders may possibly be processed according to conventional iron powder making technique and hence show good compressibility and sinterability as compared with prealloyed ones concerned.(2) 4600/4800 (Ni-Mo) type sintered steels have tensile strength of over 60kgf/mm2 (C<0.2%), although having a little heterogeneous matrix mainly due to lower diffusivity of Ni.(3) When S of 0.3% added, 4600/4800 type sintered steels show the improved machinability for drilling test-especially, tool life increased to almost double figures-with no loss of mechanical properties.(4) 4100 (Cr-Mn) type sintered steels have tensile strength of 80kgf/mm2 accompanied by fair toughness, successfully for the good combination of vacuum-sintering and heat-treatment.
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