多元微合金化对高铬铸铁凝固组织及冲击磨损性能的影响  

Influence of multi element micro alloying on solidification microstructure and impact wear properties of high chromium cast iron

作　　者：李秀兰[1] 周新军[1] 谢文玲[1] 马幼平[2] 

机构地区：[1]四川理工学院机械工程学院,四川自贡643000 [2]西安建筑科技大学,陕西西安710055

出　　处：《兵器材料科学与工程》2015年第2期18-22,共5页Ordnance Material Science and Engineering

基　　金：国家自然科学基金项目青年基金(51301115);四川省教育厅项目(14ZB0218);四川理工学院人才引进项目(2013RC06);四川理工学院校级培育项目(2012PY06)

摘　　要：通过在2.85C-31Cr合金中加入多元微量合金元素V、Ti、Nb、Mo制备多元铬系合金,研究多元微合金化对高铬铸铁的凝固组织和冲击磨损性能的影响。结果表明:铁液中部分C与强碳化物形成元素结合生成碳化物或合金碳化物;随合金元素加入量的增加,高铬铸铁凝固组织从稍微过共晶转变成共晶、亚共晶组织;相同成分的合金质量损失率随冲击磨损载荷(2.0、2.5、3.0、3.5 J)的增加呈先增加后减小、再增大的变化规律,这与材料在冲击磨损过程中的硬化行为有关;凝固组织中奥氏体数量越多,磨损质量损失率越大,尺寸细小和分布均匀的凝固组织能减小磨损质量损失率;在同一冲击载荷下,共晶成分的合金质量损失率最小,亚共晶成分的质量损失率最大。Titanium, vanadium, niobium and molybdenum were added into 2.85C- 31Cr high chromium cast iron to prepare muhicomponent chromium alloys. The influence of titanium, vanadium, niobium and molybdenum on mierostureture evolvement and impact wear properties was investigated. The results show that carbon in iron liquid together with strong carbides formation elements form the corresponding carbides or alloy carbides. With the increase of addition amount of alloy elements, the microstructure of high chromium cast iron changes from hypereutectic into eutectic and hypoeutectic alloy. The weight losses of the alloy with the same component increase first and then decrease with the increase of impact load（2.0, 2.5, 3.0, 3.5 J） ,which is related with the hardening behavior Of the wearing surface during the impact wear. The more the amount of austenite, the higher the wear weight loss rate. The microstructure with fine size and even distribution can decrease the wear weight loss rate. The wear weight loss for eutectie alloy is the minimum and that for hypoeutectic alloy is the maximum under the same impact load.

关 键 词：V TI NB MO 高铬铸铁 冲击磨损 

分 类 号：TG143.7[一般工业技术—材料科学与工程]