高Mn-V系非〓性工具鋼の基礎特性について

抄録

High Mn-V type non-magnetic tool steel with high hardness has been invesitgated on the age-hardening behavior, mechanical and magnetic properties, and resistance to wear and heat check. By aging after solution treatment, the hardness increases remarkably with precipitation of vanadium carbide to about H_RC45. In this case, Charpy impact value of about 3kg·m/cm² can be obtained. Aging hardness increases with increasing contents of carbon, vanadium and molybdenum, and decreases by adding cobalt. Preliminary cold-working raises the hardness without decreasing of toughness, and non-magnetic property is kept. Strengths at elevated temperatures are greater than those of hot-work tool steel AISI-H19, and ductility and toughness are smaller. Regarding resistance to wear this steel is superior to H19, and regarding resistance to heat check inferior slightly.