用RE-Mg-Ti对低碳铸造高速钢(6W6Mo5Cr4V)模具进行变质处理,消除了钢中网状共晶碳化物,并细化了基体组织,还可减轻W、Mo元素偏析.变质处理后,高速钢硬度、红硬性和强度变化不大,断裂韧性(K1c)和疲劳裂纹扩展门槛值(△Kth)有所提高,冲击韧性(αk)提高1倍以上,耐磨性也明显提高.各项性能指标达到了锻造高速钢水平,RE-Mg-Ti变质低碳铸造高速钢,有望实现"以铸代锻".
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