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자료유형
학술저널
저자정보
Choo, W.K. (Department of Meterials Science and Engineering, Korea Advanced Insititute of Science and Technology,) Yoon, J.C. (Research Institute of Industrial Science and Technology) Kim, J.H. (Department of Meterials Science and Engineering, Korea Advanced Insititute of Science and Technology,)
저널정보
한국재료학회 Fabrication and Characterization of Advanced Materials Fabrication and Characterization of Advanced Materials 제1권 제2호
발행연도
1995.1
수록면
245 - 250 (6page)

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Phase decomposition of supersaturated austenitic Fe-30.0wt.%Mn-7.8wt.%Al-1.3wt.%C alloy on ageing at 823 and 873K has been investigated by transmission electron microscopy(TEM) and x-ray diffraction. Diffuse superlattice reflections due to short range order were observed in the selected area diffraction pattern(SADP) of the solution-treated and subsequently iced brine water-quenched specimen. The modulated structure composed of spatial fluctuations of carbon atoms along the &lt;100&gt; directions, consistnet with the appearance of the satellites in the SADP, was formed via spinodal decomposition throughout the grain of the austenitic specimen after a brief ageing at both temperatures. Also, the spinodal decomposition was accompanied by the {100} type ordering in the carbon-rich zones. Logarithm of the wavelength of the compositional modulated structure increased linearly for that of the ageing time as the ageing treatment continued. The increasing rate rose at a certain modulation wavelength during ageing at two temperatures with the effect of the k' carbide growth on the growth kinetics of the modulated structure by spinodal decomposition process. Coarsening of the modulated structure led to the precipitation of cubic k' carbide, (Fe, Mn)<SUB>3</SUB>AlC<SUB>x</SUB> of L'1<SUB>2</SUB> structure in the carbon-rich zones.

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