PRECIPITATION STRENGTHENING TYPE Co-Ni-BASED HEAT RESISTANT ALLOY AND MANUFACTURING METHOD THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a precipitation strengthening type Co-Ni-based heat resistant alloy, to be more specific, the precipitation strengthening type Co-Ni-based heat resistant alloy which has Co₃Mo or Co₇Mo₆ precipitated in an interface between a fine twin structure and a parent phase, and is suitable for a spring, a bolt or the like used in a site exposed to a high temperature such as an engine exhaust system and a perimeter of a gas turbine, and to provide a manufacturing method therefor.;SOLUTION: This alloy comprises, by wt.%, 0.05% or less C, 0.5% or less Si, 1.0% or less Mn, 25-45% Ni, 13-22% Cr, 10-18% of Mo+1/2W, 0.1-5.0% Nb, 0.1-5.0% Fe, further one or more elements of 0.007-0.10% REM, 0.001-0.010% B, 0.0007-0.010% Mg, and 0.001-0.20% Zr, and 0.1-3.0% Ti as needed, and the balance Co with unavoidable impurities, and has a structure in which Co₃Mo or Co₇Mo₆ is precipitated in the interface between the fine twin structure and the parent phase.;COPYRIGHT: (C)2004,JPO