NiCrMoNb ALLOY WITH IMPROVED MECHANICAL PROPERTIES

Abstract

A component made of an alloy including carbon at less than approximately 0.04 weight percent, manganese at about 0.0 to about 0.2 weight percent, silicon at about 0.0 to about 0.25 weight percent, phosphorus at about 0.0 to about 0.015 weight percent, sulfur at about 0.0 to about 0.015 weight percent, chromium from about 20.0 to about 23.0 weight percent, molybdenum from about 8.5 to about 9.5 weight percent, niobium from about 3.25 to about 4 weight percent, tantalum at about 0.0 to about 0.05 weight percent, titanium from about 0.2 to about 0.4 weight percent, aluminum from about 0.15 to about 0.3 weight percent, iron from about 3.0 to about 4.5 weight percent, and the remainder being nickel. The alloy may then be subjected to heat treatment procedures such as annealing at a temperature of less than approximately 982° C. and a duration of less than approximately one hour and aging at a temperature between approximately 538° C. and 760° C. and a duration of up to approximately 100 hours. Methods of treating an alloy are also disclosed.

1 . A component formed by a process of:
 annealing an alloy at a temperature of less than approximately 982° C. and a duration of less than approximately one hour, the alloy comprising carbon at less than approximately 0.04 weight percent, manganese at about 0.0 to about 0.2 weight percent, silicon at about 0.0 to about 0.25 weight percent, phosphorus at about 0.0 to about 0.015 weight percent, sulfur at about 0.0 to about 0.015 weight percent, chromium from about 20.0 to about 23.0 weight percent, molybdenum from about 8.5 to about 9.5 weight percent, niobium from about 3.25 to about 4 weight percent, tantalum at about 0.0 to about 0.05 weight percent, titanium from about 0.2 to about 0.4 weight percent, aluminum from about 0.15 to about 0.3 weight percent, iron from about 3.0 to about 4.5 weight percent, and the remainder being nickel; and   aging the alloy at a temperature between about 538° C. and about 760° C. and a duration of up to approximately 100 hours.   
     
     
         2 . The component according to  claim 1 , wherein the alloy further comprises boron at approximately 0.0-0.005 weight percent. 
     
     
         3 . The component according to  claim 1 , wherein aging the alloy is at a temperature of approximately 677° C. and a duration of approximately 50 hours. 
     
     
         4 . The component according to  claim 1 , wherein the alloy has a room temperature yield strength of greater than 90 kilo pound force per square inch (ksi). 
     
     
         5 . The component according to  claim 1 , wherein the alloy comprises γ″ phase precipitates of tri-nickel-niobium (Ni 3 Nb). 
     
     
         6 . The component according to  claim 1 , wherein the alloy is free of δ phase tri-nickel-niobium Ni 3 Nb precipitates. 
     
     
         7 . The component according to  claim 1  wherein annealing the alloy is at a temperature of less than approximately 954° C. 
     
     
         8 . The component according to  claim 7  wherein annealing the alloy is at a temperature of less than approximately 899° C. 
     
     
         9 . The component according to  claim 8  wherein the process further includes:
 cooling the alloy subsequent to annealing. 
 
     
     
         10 . A method of treating an alloy, the method comprising:
 aging an alloy at a temperature of between about 538° C. to about 760° C. for a duration of less than approximately 100 hours, the alloy comprising carbon at less than approximately 0.04 weight percent, manganese at about 0.0 to about 0.2 weight percent, silicon at about 0.0 to about 0.25 weight percent, phosphorus at about 0.0 to about 0.015 weight percent, sulfur at about 0.0 to about 0.015 weight percent, chromium from about 20.0 to about 23.0 weight percent, molybdenum from about 8.5 to about 9.5 weight percent, niobium from about 3.25 to about 4 weight percent, tantalum at about 0.0 to about 0.05 weight percent, titanium from about 0.2 to about 0.4 weight percent, aluminum from about 0.15 to about 0.3 weight percent, iron from about 3.0 to about 4.5 weight percent, and the remainder being nickel.   
     
     
         11 . The method of  claim 10  wherein the alloy further comprises boron at approximately 0.0-0.005 weight percent. 
     
     
         12 . The method of  claim 10  wherein aging the alloy is at a temperature of approximately 677° C. and a duration of approximately 50 hours. 
     
     
         13 . The method of  claim 10  further comprising:
 annealing the alloy at a temperature of less than approximately 982° C. for a duration of less than approximately 1 hour prior to aging. 
 
     
     
         14 . The method of  claim 13  wherein annealing the alloy is at a temperature of less than approximately 954° C. 
     
     
         15 . The method of  claim 14  wherein annealing the alloy is at a temperature of less than approximately 899° C. 
     
     
         16 . The method of  claim 10  further comprising:
 cooling the alloy subsequent to annealing. 
 
     
     
         17 . The method of  claim 16  wherein cooling the alloy may be by quenching or air cooling. 
     
     
         18 . A method of treating an alloy, the method comprising:
 providing an alloy comprising carbon at about 0.015 to about 0.035 weight percent, manganese at about 0.0 to about 0.2 weight percent, silicon at about 0.0 to about 0.15 weight percent, phosphorus at about 0.0 to about 0.015 weight percent, sulfur at about 0.0 to about 0.015 weight percent, chromium from about 20.0 to about 23.0 weight percent, molybdenum from about 8.5 to about 9.5 weight percent, niobium from about 3.25 to about 4 weight percent, tantalum at about 0.0 to about 0.05 weight percent, titanium from about 0.2 to about 0.4 weight percent, aluminum from about 0.15 to about 0.3 weight percent, iron from about 3.0 to about 4.5 weight percent, boron at about 0.0 to about 0.005 weight percent, and the remainder being nickel;   annealing the alloy at a temperature of approximately 899° C. and a duration of approximately 1 hour;   cooling the alloy;   aging the alloy at a temperature of approximately 677° C. and a duration of approximately 50 hours.   
     
     
         19 . The method of  claim 18  wherein cooling the alloy may be by quenching or air cooling.