VALENCE ELECTRON STRUCTURE OF 40CrNiMo AND ITS INFLUENCES ON PHASE TRANSFORMATION KINETICS

Based on R. H. Yu’s empirical electron theory of solids and molecules, the bond length difference (BLD) analysis has been carried out on 40CrNiMo austenite structure. The valence electron structure of the austenite has been established on the basis of atomic hybridization state, atomic magnetic moment, experimental bond length, etc. ; the short range segregation of C-Cr, C-Ni, C-Mo in austenite has been ratiocinated from microscopic non-homogenerous theory of solid solusion; and the effects of C-Cr, C-Ni, C-Mo segrefation on transformation product have been proved by electronic microscopic analysis and energy spectroscopic analysis. Therefore, the formation of isothermal transformation kinetic curve of 40Cr-NiMo can be traced back to the valence electron structure of alloy phase.