Ti-6Al-4V合金の過大過小応力下における微視および巨視表面疲労き裂伝ぱ

概要

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Microscopic and macroscopic surface fatigue crack propagation studies were carried out under periodic overstressing with Ti-6Al-4V alloy.Relatively small acceleration of crack propagation (less than 10 times) occurred when the crack length was of macroscopic scale more than 200 μm.The fracture surface morphology showed that the crack propagated in zigzag manner similarly to the cases of macroscopic surface cracks in steels and aluminum alloys reported previously.A relatively good correlation was obtained in terms of the tensile strength-Young's modulus ratio σ_<B>/E and the acceleration became larger as σ_<B>/E became smaller.The surface crack growth rate in Ti-6Al-4V alloy,steels and aluminum alloy under constant amplitude loading agreed well with each other and with the through-thickness crack growth rate in defferent materials published in literature in the ΔK_<eff>/E diagram.
社団法人日本材料学会の論文
1993-10-15