結晶粒微細化を目的とした強加工法の開発

概要

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The ultra refinement of grain size is one of the most promising methods for improving the mechanical properties of structural materials. The ultra refinement of grain size by severe plastic deformation is remarkable for improving the mechanical properties of metallic materials; however, practical processes for severe plastic deformation have not been developed yet. For industrial application, developing a new process that solves the problems of the existing processes for severe plastic deformation is required. We develop three new processes to produce severe plastic deformation. The first one is to roll materials sequentially through grooved rolls changing the shape of grooves with keeping the area of the grooves. The second one is to twist a squared bar by putting it through two grooved rolls which have the same squared shapes of grooves as the bar and are set in the twisted state around a rolling axe. The third one is to repeat forging by using dies which have the same area of section and length but different shapes of the section. We succeeded in making the deformation of aluminum bars in all three processes.Keyword: Severe Plastic Deformation, SPD, grain-refinement, nanostructure
2010-10-30