研究了复合变质剂含量对新型铜合金压铸模具钢组织和性能的影响。结果表明,钾钠稀土复合变质剂的加入可以使模具钢铸态组织晶粒细化,断开晶界处连续分布碳化物网。随着变质剂的加入,模具钢的共析转变温度升高,冲击韧性随复合变质剂含量增加而提高。 The effect of composite modifier on microstructure and properties of the new copper alloy die-casting mold steel was studied. The results show that the addition of potassium-sodium rare earth composite modifier can refine the as-cast microstructure of the die steel and break the continuous distribution of carbide network in the grain boundaries. With the addition of modifier, the eutectoid transformation temperature of die steel increases, and the impact toughness increases with the content of composite modifier.