深冷处理对Cr14Mn2V2高铬铸铁组织转变和磨损性能的影响  

The Effect of Cryogenic Treatment on the Microstructure and Wear Resistance of Cr14Mn2V2 Cast Iron

作　　者：刘浩怀[1] 王均[1] 杨宏山[1] 沈保罗[1] 高升吉[1] 黄四九 

机构地区：[1]四川大学材料科学与工程学院,四川成都610064 [2]四久稀土合金铸造厂,四川成都610211

出　　处：《铸造》2006年第4期331-334,共4页Foundry

摘　　要：分别采用X射线衍射(XRD)、电子透射电镜(TEM)和磨损测量(WT)等方法研究了深冷处理对高铬铸铁显微组织和磨损行为的影响。深冷处理能有效地降低高铬铸铁中的残余奥氏体含量,促进细微碳化物的析出,但不能完全将奥氏体转化为马氏体。大量马氏体的形成和微小二次碳化物的析出,显著提高了高铬铸铁的耐磨性。当残余奥氏体含量约为15%时,材料的耐磨性能达到最好,残余奥氏体量较多或较少都不利于耐磨性的提高。结果表明,亚临界加深冷处理试样的磨损性能较未深冷的试样有较大的提高。The effects of cryogenic treatment on the microstructure and the wear behavior for high chromium cast iron were investigated by X-ray diffraction, TEM, and wear test. The results show that cryogenic treatment can further improve abrasion resistance of the high chromium cast iron. The analysis of microstructure reveals that cryogenic treatment can effectively reduce the austenite content after the subcritical heat treatment, but can not make retained austenite transform into martensite completely, and cryogenic treatment can make more secondary carbides precipitate. Martensite transformation and the secondary carbide precipitation are the cause of materials wear resitance increase. When there was about 15% retained austenite in the matrix, its abrasion resistance reaches the maximum.

关 键 词：高铬铸铁 深冷处理 亚临界处理 二次碳化物析出 马氏体相变 

分 类 号：TG113[金属学及工艺—物理冶金]