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Valence electron structure of cementite phase and its interface and the tempering phenomenon

Science China(Technological Sciences) 2002年第3期45卷 282-290页

作者：李志林刘志林刘伟东 Beijing University of Chemical Technology Beijing 100029China Department of Materials Science and Engineering Liaoning Institute of TechnologyJinzhou 121001China

Tempering is an important phenomenon in ferrous alloys. Most steels, especially alloying steels, are used after quenching and tempering. To design the composition of quenching and tempering steels, control the tempering process more effectively, improve the properties after tempering and realize the potentials of steels, the essence of tempering process and the properties of tempering products have to be understood. In this paper, the phase structure factors and interface conjunction factors of common alloying elements in cementite and its interface are calculated out. The relationships between these valence electron structure parameters and (i) the phenomena of martensite decomposition, (ii) transformation, gathering and growth of the carbides and (iii) the mechanical properties of tempering products are bult up. The nature of the effect of alloying elements on tempering process and properties of tempering products is uncovered on the level of valence electron structure. One new theoretical foundation for alloy design is provided.

关键词： valence electron structure, tempering, cementite, interface, mechanical property.

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Calculation of the valence electron structures of alloying cementite and its biphase interface

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Science China(Technological Sciences) 2001年第5期44卷 542-552页

作者：刘志林李志林刘伟东 Department of Materials Science and Engineering Liaoning Institute of Technology Jinzhou 121001 China Department of Materials Science and Engineering Liaoning Institute of Technology Jinzhou 121001 China Department of Materials Science and Engineering Beijing University of Aeronautics and Astronautics Beijing 100083 China

The valence electron structures of alloying cementite θ-(Fe, M)3C and ε-(Fe, M)3C andthose of the biphase interfaces between them and α-Fe are calculated with Yu's empirical electrontheory of solid and molecules. T... 详细信息

关键词： Yu Ruihuang's theory, alloying cementite, valence electron structure.

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Microstructure effect on nanohardness distribution for medium-carbon martensitic steel

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Science China(Technological Sciences) 2006年第1期49卷 10-19页

作者： OHMURA Takahito TSUZAKI Kaneaki Steel Research Center National Institute for Materials Science Tsukuba 305-0047 Japan

Nanoindentation measurement was performed to evaluate the local hardness distribution for quenched and tempered martensitic steel with ferrite-cementite constituent. The ratio of standard deviation to the average nanohardness was 15.4% when nanoin-dentation tests were carried out at the peak load of 1000 μN, while that of the Vickers hardness was only 1.5% at 9.8 N. Electron backscatter diffraction analysis and SEM ob-servation all showed that the large scattering of nanohardness did not depend on the crystallographic orientation of each grain but from the inhomogeneous microstructure in the sub-micron scale such as cementite distribution. Compared with the results on tung-sten single crystals with different surface orientations as well as another martensite proc-essed by modified-ausforming with the same chemical composition but more homogene-ous cementite distribution, the nanohardness showed smaller scattering, supporting the conclusion.

关键词： martensitic steel, cementite, hardness distribution, nanoindentation.

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