摘要
利用固体与分子经验电子理论(EET)对无钴高强高韧钢奥氏体中含碳与不含碳晶胞的价电子结构进行了计算和分析·得到含碳晶胞的nA值大于不含碳晶胞的nA值,故在相的转变中主要考虑含碳晶胞的影响·在含碳晶胞中合金元素Ni,Si,Cr,Mo与碳原子形成偏聚区,且Ni,Si与C的结合力比Cr,Mo的大,偏聚区能降低C的扩散能力,阻碍位错运动,推迟马氏体相变;使基体中保持高度的位错,也会导致材料中有一定数量的残余奥氏体,并细化奥氏体晶粒,使转变的马氏体尺寸减小,这对材料的韧性有利·
Taking advantage of the Empirical Electron Theory (EET) of solid and molecules, an analysis was made to the valence electron structure of cells either containing or not containing carbon of austenite in Cofree highstrength hightoughness. The effect of those cells containing carbon cells was taken into account preferably in phase transformation process because the value nA of theirs is greater than that of the cells containing no carbon. In the cells containing carbon the alloying elements Ni, Si, Cr and Mo form a gathering borough together with carbon atoms, and the forces binding Ni and Si to C are greater than those binding Cr and Mo to C. The gathering borough will reduce the diffusivity of carbon, hinder dislocation from moving and delay the martensite transformation so as to keep dislocation density high in matrix, thus keeping a certain number of residual austenite in the steel, making austenitic grain size thinner and minimizing the size of martensite transformed. All of the results as above will benefit improving the toughness of the steel.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2003年第9期820-823,共4页
Journal of Northeastern University(Natural Science)
基金
辽宁省自然科学基金资助项目(9910300103)
国家'九五'重点科技攻关项目(98 A28 01 02).
关键词
无钴高强高韧钢
固体与分子经验电子理论(EET)
价电子结构
晶胞
碳化物偏聚区
cobalt-free high-strength high-toughness steel
the empirical electron theory of solid and molecules (EET)
valence electron structure
cell
gathering borough of carbides
