FeB和Fe<sub>2</sub>B价电子结构与钢表面渗硼层硬化本质

doi:10.11896/j.issn.1005-023X.2018.04.032

Abstract
Figure/Table
References
Related Citation (15)

Download:

Full Text ( PDF ) (1202KB)
Export: BibTeX | EndNote (RIS)

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.

Key words： surface modification boronizing layer FeB Fe₂B valence electron structure hardening

Published: 25 February 2018

CLC number:

TG156.3

	Service
	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	LIU Weidong
	ZHANG Xu
	QU Hua

Cite this article:

LIU Weidong,ZHANG Xu,QU Hua. Valence Electron Structures of FeB and Fe₂B and the Hardening Essence of Boronizing Layer of Steel Surface[J]. Materials Reports, 2018, 32(4): 672-675.

URL:

http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.04.032 OR http://www.mater-rep.com/EN/Y2018/V32/I4/672

1 Mu Dong, Wang Qudong, Shen Baoluo. Research actuality of effect of boriding on microstructure and properties of steels surface[J].Materials Review A:Review Papers,2009,23(4):42(in Chinese).
慕东,王渠东,沈保罗.渗硼对钢铁表面组织与性能影响的研究现状[J].材料导报:综述篇,2009,23(4):42.
2 Tang Guangping, Huang Wenrong, Zhou Wenfeng. Birlttenent and contolrling measures of boirding layer[J].Materials Protection,2003,36(3):57(in Chinese).
汤光平,黄文荣,周文凤.渗硼层脆性及其控制措施[J].材料保护,2003,36(3):57.
3 Li Xuesong, Wu Hua, Wu Yi. Pack boronizing process and properties of the boride layer on 20CrMo steel[J].Heat Treatment of Me-tals,2009,34(5):57(in Chinese).
李雪松,吴化,吴一.20CrMo钢表面固体渗硼工艺及性能[J].金属热处理,2009,34(5):57.
4 Zhong Fenglan. The iron boride FeB in the electron theory[J].Chinese Science Bulletin,1995,40(17):1419.
5 Zhong Fenglan. Iron boride Fe2B in electron theory[J].Chinese Science Bulletin,1995,40(23):1968.
6 Li Musen, Hou Xurong, Cui Jianjun, et al. Physical essence of brittleness criterion K for borided layer[J].Transactions of Metal Heat Treatment,1995,16(1):43(in Chinese).
李木森,候绪荣,崔建军,等.渗硼层脆性判据K的物理本质[J].金属热处理学报,1995,16(1):43.
7 Li Musen, Fu Shaoli, Xu Wandong, et al. Valence electron structure of Fe2B phase and its eigen-brittleness[J].Transactions of Metal Heat Treatment,1995,31(5):201(in Chinese).
李木森,傅绍丽,徐万东,等.Fe2B相价电子结构及其本质脆性[J].金属学报,1995,31(5):201.
8 Li Musen, Jiang Jiang, Cui Jianjun. Revealing an eigen-brittleness of FeB phase from electronic scale[J].Heat Treatment of Metals,1996(6):12(in Chinese).
李木森,姜江,崔建军.从电子尺度揭示FeB相的本质脆性[J].金属热处理,1996(6):12.
9 Song Yuepeng, Feng Chengming, Xu Bin. Effect of micro-addition chromium on the valence electron structure of FeB phase[J].Tran-sactions of Materials and Heat Terament,2001,22(4):36(in Chinese).
宋月鹏,冯承明,许斌.微量铬元素对FeB相价电子结构的影响[J].材料热处理学报,2001,22(4):36.
10 Xu Juan, Chen Lin, Sun Zhongbo. Effect of chromium and lanthanum on brittleness of Fe2B phase[J].Hot Working Technology,2007,36(20):4(in Chinese).
徐娟,陈琳,孙忠波.Cr和La元素对Fe2B相脆性的影响[J].热加工工艺,2007,36(20):4.
11 张瑞林.固体与分子经验电子理论[M].长春:吉林科学技术出版社,1993.
12 刘志林,李志林,刘伟东.界面价电子结构与界面性能[M].北京:科学出版社,2002.
13 Liu Weidong, Liu Zhilin, Qu Hua. Calculation of valence electron structures in alloying γ-TiAl and its mechanical properties[J]. Rare Metal Materials and Engineering,2003,32(11):902(in Chinese).
刘伟东,刘志林,屈华.合金γ-TiAl价电子结构的计算及其力学性能[J].稀有金属材料与工程,2003,32(11):902.
14 Sun Zhongbo. Research on properties of Fe2B and it’s improvement in Fe based alloy[D].Tianjin:Hebei University of Technology,2007(in Chinese).
孙忠波.Fe2B相在Fe基合金中性质及改性的研究[D].天津:河北工业大学,2007.