水素処理によるチタン系材料の組織細粒化

概要

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Titanium alloys can be hydrogenated with large amounts of hydrogen and dehydrogenated in vacuum at elevated temperatures. This paper aims at the grain refinement of titanium alloys utilizing this phenomenon for practical application. There are two metallurgical factors for grain refinement in this process as follows. (1) Martensitic transformation : On cooling from the β phase or the α+β two phase region of hydrogenated titanium alloys, high density dislocations with uniform distribution are introduced in acicular martensites. (2) Precipitation of hydrides : On aging of hydrogenated titanium alloys, fine hydrides precipitate in matrix. The combination of the two factors described above results in the grain refinement of the commercially produced Ti-6Al-4V alloy containing large amounts of hydrogen. Specimens thus treated, exhibit ultra-fine equiaxed grains of about 1 μm diameter.
福山大学の論文