【摘要】 采用稀土复合变质剂对5W6Mo5Cr4V铸钢模具材料进行变质处理,改变了铸钢组织中的网状共晶碳化物,使基体组织得以细化,同时减轻了合金元素的偏析。变质处理后断裂韧性(K1c)和疲劳裂纹扩展门槛值(△Kth)提高,冲击韧度(αk)提高1倍以上;耐磨性明显提高;硬度、红硬性和强度变化不大。结果表明,用复合变质处理获得的低碳铸造高速钢材料,韧性指标达到了一般材质件的锻件水平。更多还原

【Abstract】 The 5W6Mo5Cr4V die material treated using compound Re modification was investigated.The results indicate that the network eutectic carbides are changed,the matrix is refined and the segregation of alloy elements was reduced as well.The fracture toughness(K1c) and threshold of fatigue crack growth(△Kth) are improved, the impact toughness(αk) increased by above one times.Wear resistance was enhanced obviously,but the strength,hardness and red hardness have almost no change.The results show that the toughness of low carbon high speed steel after Re compound modification can reach that of general forging.更多还原