论文部分内容阅读
本文在过去所研究的稀土一硼多元共渗成果基础上,进一步讨论了稀土元素在铁中强制固溶强化的作用,找到了引起合金晶体内部状态改变和提高某些机械性能的根本原因。通过“固体与分子经验电理论”计算与分析表明:在α—Fe中固溶微量La元素,起着改变基体导带导电电子浓度的作用,使之产生了以La~+离子为中心,并包括上千个基体Fe~-离子在内的“远程极化球”,出现了迭加键力,从而提高了原子键强度。同时由于La~+的固溶,减少了其周围铁原子的共价电子对数,削弱键强度,促进空位形成,提高空位浓度,从而降低了渗入元素的扩散激活能加速了钢铁材料化学热处理过程。
Based on the results of rare earth-boron multiple-permeation study in the past, this paper further discussed the role of rare earth elements in solid solution strengthening in iron and found the root cause of the change of the internal state of the alloy crystal and the improvement of some mechanical properties. Calculated and analyzed by the theory of solid and molecule empirical electricity show that the solution of trace La element in α-Fe plays a role of changing the conduction electron concentration of the conduction band of the matrix, The “long-range polarization” ball, including thousands of Fe ~ - ions in the matrix, shows the superposition of bond force and thus enhances the atomic bond strength. At the same time, due to the solid solution of La ~ +, the covalent electron logarithm of the surrounding iron atoms is reduced, the bonding strength is weakened, the formation of vacancies is promoted, the vacancy concentration is increased, and the diffusion activation energy of the infiltrated elements is reduced, thus accelerating the chemical heat treatment process of the steel material .