The invention discloses a die steel material for additive manufacturing of a lattice die and a preparation process of the die steel material, and the preparation process comprises the following steps: heating and melting an
alloy base material, atomizing and pulverizing to obtain
alloy base material
powder, mixing mixed additive phase
powder formed by mixing nano
zirconium nitride particles and AlTiLa intermediate
alloy powder with the alloy base material powder, and carrying out heat treatment to obtain the die steel material for additive manufacturing of the lattice die. And the die steel powder is subjected to
selective laser melting treatment and heat treatment, and then the die steel material is obtained. Under the
laser high temperature of
selective laser melting treatment, interface reaction of
zirconium nitride, AlTiLa intermediate alloy and alloy base material powder can be triggered, formation of
intermetallic compounds, refining of
carbide particles, purification of grain boundaries and improvement of the heat conduction capacity of the die steel material are promoted, and after heat treatment,
residual stress can be fully released, so that the service life of the die steel material is prolonged.
Internal stress and structure defects are eliminated,
anisotropy is effectively eliminated, and the
thermal fatigue resistance of the die steel material is prolonged.