摘要
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 (ΔKth)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” .
Low carbon cast high speed steel(6W6Mo5Cr4V)die was modified using RE-Mg-Ti, network eutectic carbides were eliminated, matrix structures were refined and the segregation of W and Mo elements were relieved. After RE-Mg-Ti complex modification there are no obvious changes in strength, hardness and red hardness of the steel, but the fracture toughness(K 1c) and threshold of fatigue crack growth(ΔK th) are improved, impact toughness (α k) is increased by over one time, and wear resistance is also improved obviously. The properties of modified cast high speed steel are near to forged high speed steel, 'the cast's replacing forge' of high speed steel will be realized after modification by RE-Mg-Ti.
出处
《材料与冶金学报》
CAS
2002年第4期307-310,共4页
Journal of Materials and Metallurgy
关键词
铸造高速钢
变质处理
粒状碳化物
韧性
耐磨性
模具
cast high speed steel
modification
granulated carbide
toughness
wear resistance
die
