CO-BASED ALLOY
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.