Co-based alloy

Abstract

A Co-based alloy containing not less than 0.001 mass % and less than 0.100 mass % of C, not less than 9.0 mass % and less than 20.0 mass % of Cr, not less than 2.0 mass % and less than 5.0 mass % of Al, not less than 13.0 mass % and less than 20.0 mass % of W, and not less than 39.0 mass % and less than 55.0 mass % of Ni, with the remainder being made up by Co and unavoidable impurities, wherein the contents of Mo, Nb, Ti and Ta which are included in the unavoidable impurities are as follows: Mo<0.010 mass %, Nb<0.010 mass %, Ti<0.010 mass %, and Ta<0.010 mass %.

1 . A Co-based alloy comprising:
 not less than 0.001 and less than 0.100 mass % of C;   not less than 9.0 and less than 20.0 mass % of Cr;   not less than 2.0 and less than 5.0 mass % of Al;   not less than 13.0 and less than 20.0 mass % of W;   not less than 39.0 and less than 55.0 mass % of Ni; and   the balance being Co and inevitable impurities, wherein the impurities include   less than 0.010 mass % of Mo,   less than 0.010 mass % of Nb,   less than 0.010 mass % of Ti, and   less than 0.010 mass % of Ta.   
     
     
         2 . The Co-based alloy according to  claim 1 , further comprising at least one of
 not less than 0.0001 and less than 0.020 mass % of B and   not less than 0.0001 and less than 0.10 mass % of Zr.   
     
     
         3 . The Co-based alloy according to  claim 1 , further comprising at least one of
 not less than 0.0001 and less than 0.10 mass % of Mg and   not less than 0.0001 and less than 0.20 mass % of Ca.   
     
     
         4 . The Co-based alloy according to  claim 1 , produced through hot working, solution treatment and aging treatment, the alloy
 comprising a γ phase matrix, carbide precipitated in the matrix, and a γ′ phase composed of an L1 2 -type intermetallic compound.