摘要
采用普通电渣重熔工艺和新型抽锭式电渣重熔工艺制备M2高速钢,研究了熔池深度与局部凝固时间等参数对高速钢铸锭共晶碳化物形貌和类型的影响。结果表明,电渣重熔工艺不改变碳化物类型,两种工艺制备的M2铸锭都存在M_6C、MC、M_2C三种类型的碳化物。抽锭式电渣重熔工艺通过有效控制电渣锭直径(D=120 mm)、熔速(11 mm/min)及熔池深度(h=50 mm),减少局部凝固时间,促进平直层片状共晶碳化物转变为离异棒状、粒状碳化物,碳化物平均晶粒尺寸小于50μm。加快冷却速度会降低组织中共晶碳化物的质量分数,同时也会降低共晶碳化物中强碳化物形成元素如W、Mo、V的含量,使更多碳化物及合金溶于基体中。
Effects of metal pool depth and local solidification time on the morphology and microstrueture of M2 high speed steel （HSS） made by the new pumping ESR technology and a traditional ESR process were investigated. The results showed that the type of carbide could not be changed by different processes and M6C,MC,M2C carbides were existed in both the ESR processes. Morphology of eutcctie carbides changed from plate-like type to rod-shipped and the size of eutectic carbides under 50 μm could be obtained by the right combine of ingot diameter （D = 120 mm） , melting rate （ 11 mm/min） and depth of metal pool （ h = 50 mm） using the new pumping ESR technology. With the increasing of cooling rate the concentration of eutectie carbides and strong carbide forming elements of W, Mo and V in eutectie carbides decreased which would be dissolved in matrix.
出处
《上海金属》
CAS
北大核心
2013年第5期23-26,62,共5页
Shanghai Metals
关键词
高速钢
电渣重熔
共晶碳化物
形貌
局部凝固时间
High Speed Steel, ESR, Eutectic Carbides, Morphology, Local Solidification Time
