利用EET理论预测Fe-C-Cr系高铬铸铁的淬硬性  

The Prediction of Hardenability of Fe-C-Cr High Chromium Cast Irons by Empirical Electron Theory

作　　者：孙志平[1] 沈保罗[1] 王均[1] 刘浩怀[1] 杨宏山[1] 

机构地区：[1]四川大学材料科学与工程学院,四川成都610065

出　　处：《四川大学学报（工程科学版）》2004年第6期70-73,共4页Journal of Sichuan University (Engineering Science Edition)

摘　　要：为了揭示高铬铸铁组织的微观本质并利用其分析结果预测合金的淬硬性,利用余瑞璜的固体与分子经验电子理论(EET)和Fe C Cr三元系平衡相图对Fe C Cr三元系高铬铸铁合金奥氏体的价电子结构进行了分析。结果表明,在工业应用的成分范围内C Cr键是合金奥氏体所有键中的最强键,形成C Cr偏聚单元。wCr/wC≥6时,含C Cr结构单元的权重会大大提高,促进了奥氏体的陈留,可以获得奥氏体基体组织。当wCr/wC=5.5～6.5时,Fe C Cr三元系高铬铸铁可获得最佳的淬硬性。The valence electron structure of austenite of Fe-C-Cr high chromium cast iron was studied using the empirical electron theory of solids and molecules (EET) and equilibrium phase diagram of Fe-C-Cr system, in order to reveal the microcosmic nature of the structure of high chromium white iron and predict the hardenability of the alloy based on the analytical results. Results showed that the C-Cr bonds are the strongest bonds of all bonds in alloying austenite in composition range of industrial application and, thereby, cause partial aggregation of C-Cr atomic groups. The weighting of partial aggregation of C-Cr atomic groups would be increased greatly and more austenite would be reserved to room temperature when w_(Cr)/w_C≥6. The Fe-C-Cr high chromium cast irons achieve best hardenability when w_(Cr)/w_C=5.5～6.5.

关 键 词：高铬铸铁 合金奥氏体 价电子结构 成分设计 

分 类 号：TG143.7[一般工业技术—材料科学与工程]