Heat-resistant superalloy

Abstract

A heat-resistant superalloy having chromium, aluminum, cobalt, titanium, and ruthenium added thereto as main components, and having a subcomponent(s) optionally added thereto, the remainder, excluding the main components and the subcomponent(s), comprising nickel and an impurity inevitably contained, wherein the amount of the chromium added is 2 to 25% by mass, the amount of the aluminum added is 0.2 to 7% by mass, the amount of the cobalt added is 19.5 to 55% by mass, the amount of the titanium added is [0.17×(% by mass for cobalt−23)+3] to [0.17×(% by mass for cobalt−20)+7] % by mass (with the proviso that the amount of the titanium added is 5.1% by mass or more), and the amount of the ruthenium added is 0.1 to 10% by mass.

1 . A heat-resistant superalloy having chromium, aluminum, cobalt, titanium, and ruthenium added thereto as main components, and having a subcomponent(s) optionally added thereto, the remainder, excluding the main components and the subcomponent(s), comprising nickel and an impurity inevitably contained,
 the heat-resistant superalloy being characterized in that:   the amount of the chromium added is 2 to 25% by mass,   the amount of the aluminum added is 0.2 to 7% by mass,   the amount of the cobalt added is 19.5 to 55% by mass,   the amount of the titanium added is [0.17×(% by mass for cobalt−23)+3] to [0.17×(% by mass for cobalt−20)+7] % by mass (with the proviso that the amount of the titanium added is 5.1% by mass or more), and   the amount of the ruthenium added is 0.1 to 10% by mass.   
     
     
         2 . The heat-resistant superalloy according to  claim 1 , characterized in that the amount of the titanium added is [0.17×(% by mass for cobalt−23)+3] to [0.17×(% by mass for cobalt−20)+7]% by mass (with the proviso that the amount of the titanium added is 5.3 to 11% by mass), and at least one of molybdenum and tungsten is added as the subcomponent,
 wherein the amount of the molybdenum added is 5% by mass or less, and the amount of the tungsten added is 5% by mass or less. 
 
     
     
         3 . The heat-resistant superalloy according to  claim 1 , characterized in that at least one of zirconium, carbon, and boron is added as the subcomponent,
 wherein the amount of the zirconium added is 0.01 to 0.2% by mass,   the amount of the carbon added is 0.01 to 0.15% by mass, and   the amount of the boron added is 0.005 to 0.1% by mass.   
     
     
         4 . The heat-resistant superalloy according to  claim 1 , characterized in that at least one of molybdenum and tungsten and at least one of zirconium, carbon, and boron are added as the subcomponents,
 wherein the amount of the molybdenum added is 5% by mass or less,   the amount of the tungsten added is 5% by mass or less,   the amount of the zirconium added is 0.01 to 0.2% by mass,   the amount of the carbon added is 0.01 to 0.15% by mass, and   the amount of the boron added is 0.005 to 0.1% by mass.   
     
     
         5 . The heat-resistant superalloy according to  claim 1 , characterized in that at least one of molybdenum and tungsten, at least one of tantalum and niobium, and at least one of zirconium, carbon, and boron are added as the subcomponents,
 wherein the amount of the molybdenum added is 5% by mass or less,   the amount of the tungsten added is 5% by mass or less,   the amount of the tantalum added is 2% by mass or less,   the amount of the niobium added is 2% by mass or less,   the amount of the zirconium added is 0.01 to 0.2% by mass,   the amount of the carbon added is 0.01 to 0.15% by mass, and   the amount of the boron added is 0.005 to 0.1% by mass.   
     
     
         6 . The heat-resistant superalloy according to any one of  claims 1  to  5   claim 1 , characterized in that the amount of the cobalt added is 23.1 to 55% by mass. 
     
     
         7 . The heat-resistant superalloy according to  claim 1 , characterized in that the amount of the titanium added is [0.17×(% by mass for cobalt−23)+3] to [0.17×(% by mass for cobalt−20)+7] % by mass (with the proviso that the amount of the titanium added is 5.1 to 11% by mass). 
     
     
         8 . The heat-resistant superalloy according to  claim 1 , characterized in that the amount of the ruthenium added is 0.1 to 7% by mass. 
     
     
         9 . The heat-resistant superalloy according to  claim 1 , characterized in that the amount of the titanium added is [0.17×(% by mass for cobalt−23)+3] to [0.17×(% by mass for cobalt−20)+7] % by mass (with the proviso that the amount of the titanium added is 5.3 to 10% by mass), and the amount of the ruthenium added is 0.1 to 5% by mass. 
     
     
         10 . The heat-resistant superalloy according to  claim 3 , characterized in that the amount of the zirconium added is 0.01 to 0.15% by mass, the amount of the carbon added is 0.01 to 0.1% by mass, and the amount of the boron added is 0.005 to 0.05% by mass. 
     
     
         11 . The heat-resistant superalloy according to  claim 1 , characterized by containing no η phase in the alloy phase. 
     
     
         12 . A heat-resistant superalloy member characterized in that the member is produced from the heat-resistant superalloy according to  claim 1  by at least one of casting, forging, and powder metallurgy.