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研制了含粒状碳化物的新型莱氏体型铸造模具钢，发现其可使传统莱氏体型铸造模具钢的低强韧性得以提高，并探讨了其磨损机理．结果表明，碳化物形态（大小、形貌、分布及数量）对莱氏体钢的耐磨性有明显影响．由于该新型铸造模具钢有沿枝晶间均匀分布、形貌圆整的１次碳化物和晶内弥散析出的大量２次碳化物，其耐磨性略高于相近碳化物形态的锻造３～４级偏析Ｃｒ１２类钢，明显高于锻造１～２级偏析Ｃｒ１２类钢和传统莱氏体型铸造模具钢．
A new type of ledeburite cast die steel containing granular carbides was developed and found to enhance the low strength and toughness of conventional cast ledeburitic die steel and to explore its wear mechanism. The results show that the carbide morphology (size, morphology, distribution and quantity) has a significant effect on the wear resistance of martensitic steel. Because of the new casting mold steel evenly distributed along the dendrites, the first round of carbide morphology and intracrystalline dispersion of a large number of second carbide precipitation, the wear resistance slightly higher than the similar carbide morphology forging 3 ~ Grade 4 segregation of Cr12-type steel, significantly higher than forging grade 1 or 2 segregation of Cr12-type steel and the traditional ledeburite casting mold steel.