金属粉末射出成形による機械構造用合金鋼焼結体の作製とその強度特性

概要

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The fabrication conditions and the effect of heat treatment on the mechanical properties of sintered structural alloy steel compacts made by metal injection molding were studied. Specimens were made of gas-atomized SNCM439 steel powder, which was blended with a polyamide binder system. The compacts were debound in air at various temperatures between 513K and 553K and sintered in vacuum at 1623K for 7.2ks. The specimens were tempered at various temperatures between 373K and 873K after oilquenching from 1073K. The carbon control of sintered compacts decreased linearly with increasing in debinding terperature. This means that the carbon content of sintered compacts can be controlled accurately by the debinding terperature. The higher the debinding terperature was, the lower the tensile strength of sintered compacts and the higher the elongation became. The tensile strength of the heat-treated compacts decreased with increasing in tempering temperature, on the other hand, the elongation increased. Though the tensile strength of the heat-treated compacts was equivalent to that of the JIS SNCM439 steel, the elongation and the Charpy impact value were smaller because of the presence of small pores. Improving the density of the sintered compacts is considered to be efficient to get more ductility in the heat-treated compacts.
一般社団法人日本機械学会の論文
1998-02-25