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Vol.33, No.1, 49 ~ 56, 1995

Title

Effects of α2 Phase on the Fatigue Crack Propagation Behavior of a Ti3Al - Nb Alloy

정현호H . H . Chung, 김낙준Nack J . Kim

Abstract

Fatigue crack propagation behavior of a two-phase (α₂+β) Ti₃Al-Nb alloy has been investigated. Various heat treatments were used to vary the volume fraction and the morphology of α₂ phase. Results show that the volume fraction and morphology of α₂ phase have large influence on the fatigue crack propagation behavior. Fine colony structure shows no variation in the fatigue crack propagation rate as α₂ volume fraction changes. On the other hand, equiaxed structure and basket-weave structure shows the increased crack growth resistance as α₂ volume fraction decreases. Such increased crack growth resistance is attributed primarily to a tortuous morphology of crack path which rsuslts in a reduction in the crack driving force from crack deflection and roughness-induced crack closure mechanism. Quantitative metallography and experimental crack closure mesurements are presented to substantiate such interpretations.

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