The invention discloses a high-strength and high-
toughness CoCrMoW
alloy based on
laser additive manufacturing and a preparation method of the high-strength and high-
toughness CoCrMoW
alloy. The preparation method comprises the following steps of (1) gas atomization
powder preparing, wherein after CoCr
alloy raw materials are molten together into melt, the melt is crushed by high-pressure
inert gas into tiny liquid drops, and
powder is formed after solidification and cooling; (2) blank additive manufacturing forming, wherein the
powder is prepared into a formed blank through the
laser additivemanufacturing technology; (3) strengthening and
toughening heat treatment, wherein the formed blank is subjected to strengthening and
toughening heat treatment to obtain the high-strength and high-
toughness CoCrMoW alloy based on
laser additive manufacturing, the yield strength of the alloy reaches up to 0.9 GPa or above, the tensile strength of the alloy reaches up to 1.2 GPa or above, and the
ductility of the alloy reaches up to 14% or above; and (4) plastifying and
toughening heat treatment, wherein the high-strength and high-toughness CoCrMoW biological alloy obtained in the step (3) canbe subjected to subsequent plastifying and toughening heat treatment, the
plasticity of the high-strength and high-toughness CoCrMoW biological alloy based on
laser additive manufacturing can be further improved, and the
plasticity of the high-strength and high-toughness CoCrMoW biological alloy based on
laser additive manufacturing can reach 26% or above on the premise of guaranteeing that the tensile strength is 1.1 GPa or above.