灰铁中初生奥氏体形核机理探讨

本文以金属结晶与铸铁冶金原理为理论基础,对工业熔炼条件下的灰铁铁水结晶时二氧化硅析出的热力学与动力学条件、初生奥氏体析出的动力学扩散条件,以及他们之间的共格关系做了详尽的计算与分析,初步结果表明:鳞石英可以成为初生奥氏体结晶的有效形核质点。更有意义的是,在此基础上,借助现代测试技术与改变一些对二氧化硅析出起显著作用的因素,对该结论进行了验证,并提出了一些新的观点。

The Exploration of the Nuclear Formation Mechanism ofInitial Austenite in Grey Iron

Based on the theoretical foundation of principles of metal crystallization and cast iron metallurgy, the detailed calculations and analyses have been made for the thermodynamic and dynamic conditions of silica separation, the dynamic diffusion condition of initial austenite separation and the coherent lattice relation between them during the crystallization of the grey molten iron under the industrial smelting conditions. Initial results indicate that dridymite may be used as effectively nucleating particle for the initial austenite crystallization. It's more signiticant that further confirmations have been made by means of modern meassuring technology and by the alternation of distinctly effected factors on separation of silica, some new conclusions are put forward.