時効した Ti-13V-11Cr-3Al 合金の機械的性質に及ぼす冷間加工度と時効温度の影響(<特集>チタンおよびチタン合金)

概要

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This study deals with the effects of cold work and aging after solution treatment on the mechanical properties of Ti-13V-11Cr-3Al alloy in order to get better strength ductility relationship through varying the state of alpha phase precipitation. The alloy was cold worked with 30%-90% reduction and aged at temperatures of 600 K-750 K. Specimens were then tensile tested at room temperature and their microstructures and fracture surfaces were observed. Strength has increased with increasing the degree of cold working, while ductility has decreased. The ductility has, however, also been improved by cold working in the sense that the ductility of more cold worked specimens is superior to that of less cold worked ones, when compared at the same strength level. Lower aging temperatures have yielded better strength and ductility combination than higher ones. The variation in the mechanical properties is explained by the change of alpha phase precipitation from the preferential one on the grain boundaries in the solution treated and aged specimens, to uniform one in the matrix in the cold worked and aged specimens. Cold work improves the mechanical properties, but it accelerates precipitation of TiCr_2 in aging.
社団法人日本鉄鋼協会の論文
1986-04-01