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| ANALYSIS OF VALENCE ELECTRON AND MAGNETIC MOMENT STRUCTURES OF α-Fe, γ-Fe AND Fe_4N——ELECTRON THEORY OF CASE HARDENING, α-TO γ-Fe PHASE TRANSFORMATION AND CERTAIN OTHER RELATED PROCESSES |
| Yu Ruihuang (S. H. Yu) (Department of Physics; Jilin University; Changchun; Solid and Molecular Research Group; Jinan University; Guangzhou ) |
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Cite this article:
Yu Ruihuang (S. H. Yu) (Department of Physics; Jilin University; Changchun; Solid and Molecular Research Group; Jinan University; Guangzhou ). ANALYSIS OF VALENCE ELECTRON AND MAGNETIC MOMENT STRUCTURES OF α-Fe, γ-Fe AND Fe_4N——ELECTRON THEORY OF CASE HARDENING, α-TO γ-Fe PHASE TRANSFORMATION AND CERTAIN OTHER RELATED PROCESSES. Acta Metall Sin, 1982, 18(3): 336-349.
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Abstract On the consideration of series of experimental and theoretical results, the type A and B hybridizations of states of Fe are constructed in the form of 18 discontinuous of hybride levels, belonging to which various valence electrons, atomic magnetic moment and bond length parameters are listed. On the basis of these parameters together with the parameters of N obtained from diatomic molecular spectroscopy, analysis of the valence electron and magnetic moment structures of α-Fe, γ-Fe and Fe_4N=Fe~cNFe_3~f are made. From these structures, interpretation of the space distribution of magnetic moments in the crystalline lattice of α-Fe obtained from neutron diffraction, and interpretation of experimental magnetization curves along [100], [111] and [110] of α-Fe are made and the cause of difference of the atomic magnetic moments of Fe~c and Fef in Fe~cN Fe_3~f are analysed. The phase transformation α-Fe→γ-Fe as due to magnetic origin is contemplated with care. The case hardening by nitriding steel at high temperature and the graphitation in cast iron due to heat effect at high temperature are both traced back to the valence electronic structure origin.
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Received: 18 March 1982
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