金属粉末射出成形によるマルテンサイト系ステンレス鋼の組織制御

概要

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Microstructure control in martensitic stainless steel compacts fabricated by metal injection molding was investigated. The specimens were made by injecting the mixture of gas-atomized powder and a polymer binder into a metallic mold. The injection moled compacts were debound in air at a temperature between 533K and 593K for 7.2ks. They were sintered in vacuum at 1573K and 1623K for 7.2ks. The carbon content of the sintered compacts decreased linearly with increasing the debinding temperature. This means that the debinding temperature can control the carbon content of the sintered compacts accurately. The microstructures of the sintered compacts drastically changed from the debinding temperature of 573K. They became α-phase and γ-phase lower than 573K and only α-phase higher than 573K. The mechanical properties of the sintered compacts corresponded to the change in the microstructure.
2010-10-25