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.
出处
《铸造》
EI
CAS
CSCD
北大核心
2006年第4期331-334,共4页
Foundry
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
high chromium cast iron
deep cryogenic treatment
subcritical treatment
secondary carbide precipitation
martensite transformation
