IRON-BASED SINTERED ALLOY AND MANUFACTURING METHOD THEREOF

摘要

To provide an iron-based sintered alloy excellent in shape accuracy and wear resistance, and reduced hostility to mating materials, and having sufficient hardness after tempering, as well as a manufacturing method thereof. Iron-based alloy powder of a composition comprising Cr: from 1 to 3.5 mass%, Mo: from 0.2 to 0.9 mass%, V: from 0.1 to 0.5 mass% and the balance of Fe and impurities, and carbon powder are mixed at a ratio of the carbon powder based on the entire portion within a range from 0.8 to 1.1 mass%, the mixture is compacted, the compacted body is sintered and quenching is applied to the sintered body heated again after once lowering temperature of the sintered body. This can provide an iron-based sintered alloy where fine M<7#191C?3#191 carbides are dispersed in martensitic texture.