β型チタン合金の組織制御(オーガナイズドセッション,材料と組織)

概要

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In recent years, higher strength and higher performance are demanded in polycrystalline metallic materials. Grain refinement is one of the most attractive method to achieve this purpose since it usually does not sacrifice the ductility or toughness. In this study, we attempted grain refinement methods based on traditional static annealing preceded by cold rolling and on intense plastic deformation in a Ti-15V-3Cr-3Sn-3Al alloy, which is a typical beta type titanium alloy. The latter deformation was performed by folding the thin sheet and cold-rolled in the overlapped state. In the traditional static annealing treatment, the grain size of specimen was changed from 37.7 to 13.3 μm. In the intense plastic deformation, a nominal strain as large as 99.1%, i.e., true strain of 4.67, was given to the specimen successfully. Although the extent of work hardening was prone to saturate after the true strain reached about 1.5, a possibility still remains that the subgrain boundaries grow into large angle grain boundaries by the intense plastic deformation.
一般社団法人日本機械学会の論文
2004-09-23