1C-8Cr系高温焼戻し冷間工具鋼の経時寸法変化におよぼす残留オーステナイト安定化の影響

概要

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The elapsed dimensional change characteristics of 1C-8Cr cold work die steel were studied by considering tempering temperature and subzero treatment. Elapsed dimensional change becomes extremely large when tempered at higher than 773K compared with low temperature tempering. It is caused by the chemical instability and increased strain of retained austenite derived from martensitic transformation after high temperature tempering. To decrease elapsed dimensional change while keeping the high hardness at high temperature tempering, it is effective to add the stabilizing treatment: additional tempering at 625K to 753K. Subzero treatment, however, can not work effectively to suppress dimensional change, and also requires the stabilizing treatment. The mechanism to prevent this dimensional change is discussed from a view point of stabilizing behavior of small amount of retained austenite.
電気製鋼研究会の論文