ステンレス鋼焼結体の耐熱耐酸化性について

概要

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The mechanical properties and oxidation behavior were studied at various temperatures using 304L-and 310-type sintered materials prepared of water-atomized stainless steel powders, mainly in relation to press-sintering conditions and Si-addition in the range 1-4%. The results were summarized as follows: (1) Tensile strength was almost proportional directly to the density of sintered materials and toughness was exponential to that all over the temperatures below 900°C, where the latter was varied under appreciable influence of pore-morphology even at higher temperature. (2) Tensile strength and toughness were simultaneously able to be improved for higher Si-content, because of δ-ferrite which promoted sinterability and of resultant α/γ duplex structures in sintered materials. On the other hand, creep-rupture strength decreased at prolonged time to 700°C, while a fairly higher value was obtained in a 310L-0.4%C specimen (AIC HK 40). (3) Ductility and toughness were more deteriorated for 304L and 310L sintered materials exposed to air at 900°C, and less for higher Si-content because of less internal oxidation rate. Oxidation resistance was improved for larger size of particles, lower porosity, higher sintering temperature.