Co-ni base heat-resistant alloy and method for producing thereof

Abstract

A Co—Ni base heat-resistant alloy is composed of, all by weight: not more than 0.05 mass % of C; not more than 0.5 mass % of Si; not more than 1.0 mass % of Mn; 25 to 45 mass % of Ni; 13 to less than 18 mass % of Cr; 7 to 20 mass % of Mo+½W of one kind or more of Mo and W; 0.1 to 3.0 mass % of Ti; 0.1 to 5.0 mass % of Nb; 0.1 to 5.0 mass % of Fe, with the balance of substantially Co and inevitable impurities.

1 . A Co—Ni base heat-resistant alloy comprising: all by weight, 
 not more than 0.05 mass % of C; not more than 0.5 mass % of Si; not more than 1.0 mass % of Mn; 25 to 45 mass % of Ni;  13  to less than 18 mass % of Cr; 7 to 20 mass % of Mo+½W of at least one of Mo and W; 0.1 to 3.0 mass % of Ti; 0.1 to 5.0 mass % of Nb; 0.1 to 5.0 mass % of Fe; and the balance of substantially Co and inevitable impurities.  
 
     
     
         2 . The Co—Ni base heat-resistant alloy according to  claim 1 , further comprising: 0.007 to 0.10 mass % of REM.  
     
     
         3 . The Co—Ni base heat-resistant alloy according to  claim 1 , further comprising: all by weight, 
 at least one selected from the group consisting of 0.001 to 0.010 mass % of B; 0.0007 to 0.010 mass % of Mg; 0.001 to 0.20 mass % of Zr.  
 
     
     
         4 . The Co—Ni base heat-resistant alloy according to  claim 1 , further comprising: all by weight, 
 0.007 to 0.10 mass % of REM; and at least one selected from the group consisting of 0.001 to 0.010 mass % of B; 0.0007 to 0.010 mass % of Mg; and 0.001 to 0.20 mass % of Zr.  
 
     
     
         5 . A preparation method of Co-Ni base heat-resistant alloy, the method comprising the steps of: 
 subjecting an alloy which contains not more than 0.05 mass % of C; not more than 0.5 mass % of Si; not more than 1.0 mass % of Mn; 25 to 45 mass % of Ni;  13  to less than 18 mass % of Cr; 7 to 20 mass % of Mo+½W of one kind or more of Mo and W: 0.1 to 3.0 mass % of Ti; 0.1 to 5.0 mass % of Nb; 0.1 to 5.0 mass % of Fe; and the balance of substantially Co and inevitable impurities, to a solid solution heat treatment at 1000 to 1200° C. or a hot working at this temperature;    then subjecting this to a cold working or a warm working having a working ratio of not less than 40 mass %; and    then subjecting this to an aging heat treatment at 500 to 800° C. for 0.1 to 50 hours.    
     
     
         6 . The preparation method of Co—Ni base heat-resistant alloy according to  claim 5 , wherein said alloy further comprises: 0.007 to 0.10 mass % of REM.  
     
     
         7 . The preparation method of Co-Ni base heat-resistant alloy according to  claim 5 , wherein said alloy further comprises: all by weight, 
 at least one selected from the group consisting of 0.001 to 0.010 mass % of B; 0.0007 to 0.010 mass % of Mg; and 0.001 to 0.20 mass % of Zr.    
     
     
         8 . The preparation method of Co—Ni base heat-resistant alloy according to  claim 5 , wherein said alloy further comprises: all by weight, 
 0.007 to 0.10 of REM, and at least one selected from the group consisting of 0.001 to 0.010 mass % of B; 0.0007 to 0.010 mass % of Mg and 0.001 to 0.20 mass % of Zr.