Electron diffraction study of aging processes in Fe-1.83 wt pct C martensite at room temperature |
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| Authors: | S. B. Ren T. Tadaki K. Shimizu X. T. Wang |
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| Affiliation: | (1) Department of Physics, Nanjing University, 210008 Nanjing, People’s Republic of China;(2) Institute of Scientific and Industrial Research, Osaka University, 567 Ibaraki, Osaka, Japan;(3) Kanazawa Institute of Technology, 921 Nonoichi, Ishikawa, Japan;(4) Department of Materials Science and Engineering, Xi’an Jiatong University, 710049 Xi’an, People’s Republic of China |
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| Abstract: | Aging processes occurring in an Fe-1.83 wt pct C martensite at room temperature have been studied by electron diffraction, assisted by transmission electron microscopy observation. Fourier analysis of diffuse scattering from the martensite suggested that a spinodal decomposition occurred therein. The spinodally modulated microstructure was composed of a dominant wave with a wavelength of about 1 nm and nondominant waves with longer wavelengths and was observed not to grow even after aging for several months. The reason for the nongrowth may be that the coarsening was stopped by strong elastic interactions between carbon-enriched and carbon-depleted regions. Furthermore, the tetragonality of the martensite was observed to remain constant during aging, suggesting that carbon redistribution during spinodal decomposition occurred within one set of the octahedral interstitial sitesO z only. formerly Visiting Researcher, The Institute of Scientific and Industrial Research, Osaka University |
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