|
|
|
| AN ANALYSIS OF VALENCE ELECTRON STRUCTURE OF Fe-C MARTENSITE |
| ZHANG Ruilin; YU Ruihuang (S. H. Yü) (Department of Physics; Jilin University; Changchun) (Manuscript received 27 May; 1983) |
|
Cite this article:
ZHANG Ruilin; YU Ruihuang (S. H. Yü) (Department of Physics; Jilin University; Changchun) (Manuscript received 27 May; 1983). AN ANALYSIS OF VALENCE ELECTRON STRUCTURE OF Fe-C MARTENSITE. Acta Metall Sin, 1984, 20(4): 279-285.
|
|
|
Abstract Based on the BLD method of the empirical electron theory of solids and molecules, the valence electron structure of Fe-C martensite was established. Each carbon atom making fractional covalent bonds with its 1st, 2nd and 3rd Fe neighbours forms a small cell to be called carbon involved unit. And the corresponding small cell of Fe atoms containing no carbon to be called no carbon unit. The martensite crystal structure is built upon by these two types of units. They distribute randomly in the martensite crystal. For the 1.7 wt-％ C martensite, the result shows: in the carbon involved units, there are three kinds of Fe atoms, Fe_Ⅰ, Fe_(Ⅱ) and Fe_(Ⅲ), on the 11th, 10th and 8th hybrid levels of A-type hybridization states of Fe respectively, and carbon atom is on its 6th hybrid level; in the no carbon units, the Fe is on the 8th level of A-type. In the carbon involved units, n_A=0.9991 and n_B=0.8479, and in the no carbon units, n_A and n_B have the same values as in α-Fe. The relative number of the two kinds of units changes with the content of carbon. Comparison of the values of n_A and n_B in the two kinds of units immediately shows that the hardness of martensite must increase with the content of carbon. This agrees with the experimental fact.
|
|
Received: 18 April 1984
|
1 Cohen,M.,Fandamentals of Martenstitic Reaction,中美冶金学术年会报告,北京,1981．
2 徐祖耀,马氏体相变与马氏体,科学出版社,1980．
3 余瑞璜,科学通报,23(1978) ,217．
4 余瑞璜,吉林大学自然科学学报,(1979) ,№ 4,54．
5 余瑞璜,科学通报,26(1981) ,206．
6 Pearsen, W. B., A Handbook of Lattice Spacings and Sturctures of Metals and Alloys, Pergamon Press, New York, 1958, p. 121．
7 De Cristofaro, N.; Kaplow, R., Metall. Trans., 8A (1977) , 35．
8 Choo, W. K.; Kaplow, R., Acta. Metall., 21 (1973) , 725．
9 余瑞璜,金属学报,18(1982) ,336．
10 Kurdjumov, G. V.; Khachaturyan, A. G., Acta Metall., 23 (1975) , 1077．
11 Pearsen, W. B., A Handbook of Lattice Spacings and Structures of Metals and Alloys, Pergamon Press, New York, 1958, p. 927．
12 余瑞璜,γ,γ’,ε,δ-Fe和Fe_3Si,Fe_4N,FeP的价电子结构分析,待发表.
13 Yensen, T. D., Trans. ASM, 27 (1939) , 797．
14 袁祖奎,Fe-Cr“σ相”价电子结构的分析,待发表.
15 余瑞璜,渗碳体(Fe_3C)价电子结构分析,待发表.s |
| No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
