摘要
为提高铸造高速钢模具的韧性 ,采用RE Mg Ti复合变质剂对低碳铸造高速钢(6W6Mo5Cr4V)模具进行变质处理。研究结果表明 :(1 )变质处理可消除钢中网状共晶碳化物 ,细化基体组织 ,还可减轻W、Mo元素偏析 ;(2 )变质处理后 ,高速钢硬度、红硬性和强度变化不大 ,断裂韧度 (KⅠc)和疲劳裂纹扩展门槛值 (ΔKth)有所提高 ,冲击韧度 (αk)提高 1倍以上 ,耐磨性也明显提高 ;(3)各项性能指标达到了锻造高速钢水平 ,用RE Mg Ti变质处理低碳铸造高速钢 ,可以实现“以铸代锻”。
The low carbon cast high speed steel (6W6Mo5Cr4V) die had been modified using RE-Mg-Ti to improve its toughness. The result shows that: (1) the network eutectic carbides were eliminated, matrix structures were refined and the segregation of W and Mo elements were relieved; (2) after RE-Mg-Ti complex modification, a little effects can be found on the strength, hardness and red hardness, but the fracture toughness (K Ⅰc ) and threshold of fatigue crack growth (Δ K th ) are improved meantime, and impact toughness (α k ) is increased by over one time, and wear resistance is also improved mostly too; (3) the properties of the modified cast high speed steel are close to forged high speed steel.
出处
《石油机械》
北大核心
2004年第6期4-6,83,共3页
China Petroleum Machinery
基金
陕西省科委
陕西省自然科学基金项目 ("高速钢凝固组织控制技术研究"
编号NO 9940 40 5 0 9)
