钢件表面改性层价电子结构及其对性能的影响

Valence electron structures and their impact on steel surface modification layer

为了研究C、N、V、Nb、Ti元素表面改性层行为机理,基于固体与分子经验电子理论(EET),计算了钢件表面改性层及基体中相及相界面的电子结构参数的统计值,研究了改性层价电子结构参数统计值与钢件性能的关系。结果表明:表面改性层中n′_A越大,固溶强化效果越好,表面改性层的硬度、耐磨性越高;表面改性层中Δρ′越大,界面强化效果越好,表面改性层的硬度、耐磨性越高;表面改性层与基体间过渡层中n′_A、Δρ′的变化越连续,改性层与基体的结合越好。这些研究为钢件的表面改性提供理论依据。

In order to study the mechanism of the modified layer containing C, N, V, Nb and Ti elements, a statistical analysis on electron structure parameters are conducted for the matrix and modified layer of steel. Also, the relationships between the statistical characteristics of electron structure parameters and the properties of steels are derived. The results show that the larger the n＇A in modified layer, the higher the solution strengthen, and the greater the hardness and wear-resistant; the larger the △ρ＇ in modified layer, the better the interface strengthen, and the greater the hardness and wear-resistant; the more continuous the variations of n＇A and △ρ＇ in the transition layer, the greater the conjunction of modified layer and matrix. The study provides a theoretical basis for the steel surface modification.