Abstract: Based on the empirical electron theory of solids and molecules (EET), the valence electron structures (VESs) of FeB and Fe2B were calculated, and then the relationship between them and hardening in boronizing layer of steel surface was analyzed. It is showed that after boronizing, the basic reason of the increase of hardness and abrasive resistance in steel surface lies in the binding forces of the strongest bond of FeB and Fe2B are far bigger than that of α-Fe in matrix. The hardness of FeB is bigger than that of Fe2B, which microscopic essence lies in the binding force of the strongest bond, the binding force of the main bond structure connection and the covalence density in FeB is 27.12%,4.8% and 3.66% bigger than that of Fe2B respectively. Compared with Fe2B, the covalence bond space distribution is more nonuniform of FeB while its main bond structure has stronger covalence but that of Fe2B has stronger metallicity, which is the basic reason that brittleness of FeB is bigger than that of Fe2B. The bonding power of FeB is only bigger than that of Fe2B 0.85%, so Fe2B priority to formed easily changes to FeB and lead to the brittleness increase in boronizing layer of steel surface.
刘伟东, 张旭, 屈华. FeB和Fe2B价电子结构与钢表面渗硼层硬化本质[J]. 《材料导报》期刊社, 2018, 32(4): 672-675.
LIU Weidong, ZHANG Xu, QU Hua. Valence Electron Structures of FeB and Fe2B and the Hardening Essence of Boronizing Layer of Steel Surface. Materials Reports, 2018, 32(4): 672-675.
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2018, Vol. 32 
