CO-CR-MO-BASED ALLOY, AND METHOD FOR PRODUCING CO-CR-MO-BASED ALLOY

摘要

A Co-Cr-Mo-based alloy which is produced by heating a Co-Cr-Mo-based alloy containing 22 to 33 mass% inclusive of Cr and 3 to 7 mass% inclusive of Mo at a temperature of 1000°C or higher, subjecting the heated alloy to a hot working at a height ratio of 50% or more and then gradually cooling the resultant product so that massive transformation of the product can occur, and which has a crystal structure that is an epsilon-phase having an HCP structure, a 0.2% proof stress of 600 MPa or more at room temperature and a 0.2% proof stress of 450 MPa or more at 600°C, can exhibit improved strength regardless of whether the alloy is subjected to precipitation strengthening or not, and can have excellent strength properties in a medium temperature range; and a method for producing the Co-Cr-Mo-based alloy.