針状α組織を有する Ti-6Al-4V 合金のき裂進展機構と破壊靱性

概要

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To understand the microfracture process, Acoustic Emission three dimensional location, Acoustic Emission source characterization and fractography method have been applied for fracture toughness testing of acicular α structure in Ti-6Al-4V alloy. In this fracture process, quasi-cleavage microcracks of about 200μm diameter were nucleated at the pre-fatigue crack tip along crack front, of which distribution in the direction normal to fracture surface was about ⊿z=1.2mm. Main crack growth is related to the condition where the coalescence of these microcracks occurs through specimen thickness. From these results, fracture toughness K_<IC> and crack tip opening displacement CTOD_C were evaluated quantitatively, using ductile fracture criterion, and it could be concluded that these microcrackings enhance the fracture toughness of acicular α-Ti alloy.
社団法人日本鉄鋼協会の論文
1986-01-01