CO-FE-NI ALLOY WITH HIGH THERMAL CONDUCTIVITY AND HIGH STRENGTH FOR MOLD AND ADDITIVE MANUFACTURING

The disclosure relates to a Co-Fe-Ni alloy with high thermal conductivity and high strength for a mold and an additive manufacturing method thereof. The Co-Fe-Ni alloy with high thermal conductivity and high strength includes the following chemical components in percentage by weight : 0-0.01 % of C, 12-18 % of Ni, 38-42 % of Fe, 0-1.2 % of Cr, 0-0.05 % of X, less than 0.015 % of P, less than 0.010 % of S, and the balance of Co and inevitable impurities, where X is Sc, and/or Y, and/or Nd, and/or Pd. Compared with the prior art, in the disclosure, a Co-based medium-entropy alloy is applied to the mold, and then rare earth elements such as palladium or/and scandium, yttrium, and neodymium are added thereto, different toughness combinations are obtained by using additive manufacturing and controlling subsequent heat treatment. On the basis of this, the alloy according to the present disclosure exhibits improved thermal conductivity, reliability and service life on the premise of not significantly increasing the cost while maintaining mechanical properties of the existing mold steel, and may replace part of the existing mold steel used in molds, which has considerable economic benefits.