耐磨锰钢合金元素作用及性能的电子理论研究

【作者】 郑丽平；

【导师】 杨瑞成；

【作者基本信息】 兰州理工大学 ， 材料学， 2003， 硕士

【摘要】 本文研究了合金元素对不同成分锰钢基体的作用及其对加工硬化行为的影响，建立了微观价电子参数同宏观性能的联系。依据固体与分子经验电子理论的键距差法，计算了不同成分奥氏体锰钢的价电子结构参数，重点分析了合金元素对基体的强化作用，合金元素的偏聚与贫化，合金元素对马氏体相变的影响，分析了含碳八面体硬团对基体的强化作用，以及键络强度分布的均匀性对锰钢基体冲击韧性的影响；以数学统计和原子间的相互作用力为依据，建立了锰钢中不同结构单元的分布模型，提出新的参数——结构单元分布因子来表征结构单元的实际分布几率；讨论了锰钢中碳、锰含量的变化对各类型结构单元的价电子参数和分布几率的影响，提出了两个新的参数——马氏体转变键能因子和键强因子，来表征奥氏体的稳定性以及马氏体转变的难易程度，从而与马氏体转变量建立联系。本工作从价电子和原子结构层次讨论了奥氏体锰钢的耐磨本质和规律，从而为耐磨合金的成分设计提供了理论依据。更多还原

【Abstract】 The effects of alloy elements on the matrix of austenitic manganese steel and its behavior of work hardening were studied in this thesis, establishing the relations of valence electron parameter and macro-property. Valence electron structure parameter of manganese steel with various contents were calculated by BLD in EET. It was placed emphases on the problems of strengthening effects of alloy elements and octahedral structure units on steel matrix, the poorness and richness of alloy elements, the martensitic transformation affected by alloy elements, the impact toughness influenced by uniformity of gradient distribution of valence electron structure. The model of structure unit distribution probability was established at the foundation of statistics andatomic interactions, meanwhile, a new parameter-structural unit distribution factorwas proposed. Valence electron structure parameter and structure unit distribution were studied with the changing of contents of C and Mn in manganese steel. Two parameters, martensitic transformation bond energetic factor and martensitic transformation bond strength factor, were proposed to discuss the stability of austenite and the transformation of martensite and establish relations between micro-structure and macro-property. The wear resistance of austenitic manganese steel was discussed at the level of valence electronic and atomic structure, providing theoretical base of designing ingredient of alloy.更多还原