<論文>一方向凝固したFe-25%Cr-3.5%C三元共晶合金の機械的性質

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Unidirectional solidification of Fe-25% Cr-3.5% C eutectic high chromiumwhite cast irons was conducted under a solidification rate range from 1.3 X 10-3mmls to 1.3 X 10-1 mmls to clarify the deformation behavior of the irons atelevated temperatures. The alloy specimens were processed in the parallel andvertical directions to the solidification direction, and a compression test wasdone under a strain rate range from 2.5 X 10- 4 to 1.7 X 10-2 at various temperatures up to 1073 K. The relation between the microstructure and high temperaturestrength was studied. The strength depended on the morphology of eutecticcells and the orientation of primary carbides. The maximum compressivestrength of the parallel direction to the solidification direction was larger thanthat of the vertical direction within the whole temperature ranges. The strainrate sensitivity exponent showed larger value in the vertical direction than inthe parallel direction. These results suggest that the strength of the paralleldirection is mainly supported by the elongated primary carbide phases, whilethe strength of vertical direction is supported by the iron matrix and stronglydepend on the deformation behavior of the iron matrix. The rule of mixtureswas used for analysis of the experimental results described above.
秋田大学の論文