奥氏体不锈钢中氮合金化的价电子理论研究

Study On the Valence Electron Theory Of Nitrogen Alloying In Austenite Stainless Steel

利用余瑞璜的“固体与分子经验电子理论”从决定合金元素行为的聚合态原子价电子结构出发,研究了奥氏体不锈钢中氮合金化的作用机制。依据原子杂化状态、实验键距等已知资料建立了含 N-Ni 和含 C-Ni 奥氏体晶胞的价电子结构。分析表明,奥氏体稳定化元素氮是由于溶入奥氏体相中增强了原子间的结合力,较强的 Fe-N 结合力阻止了奥氏体的相变,降低了相变温度。在奥氏体中氮原子与镍原子产生交互作用,使奥氏体相的原子结合力不仅得到提高,而且分布均匀,于是促进奥氏体相的稳定存在,同时比碳更有利于奥氏体组织的韧性改善。

Based on Yu's “Empirical electron theory of solids and molecules”,the mechanism of nitrogen alloying in austenitic stainless steel was inves- tigated.According to the atom's electronic state and the experimental bond length ect,the valence electron structures of austenite sells containing N —Ni and C—Ni were established,the study results show that since the austenite stabilizing element N melts into austenite,the combining strength among atoms was enhanced.The higher Fe—N combining energy resists transformatin of solid state austenite phase,meanwhile,the transformation points were decreased.In austenite cells,the interaction between N atom and Ni atom made the atom's combining strength not only enhanced but also distributed more uniform,so that the austenite could keep steady state and it's toughness was improved.