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Effect of microstructure on the fatigue crack growth behaviour of a near-α Ti alloy
Affiliation:1. Materials Group, Bhabha Atomic Research Centre, Mumbai 400085, India;2. Faculty of Air Force, Military Institute of Technology, Girinagar, Pune 411025, India;1. Pprime Institute UPR 3346 CNRS, ENSMA - Université de Poitiers, Department of Mechanics and Physics of Materials, 1 Avenue Clément Ader, BP 40109, 86961 Futuroscope-Chasseneuil, France;2. Airbus Group Innovations, 12 rue Pasteur, 92150 Suresnes, France;1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi?an, Shaanxi 710072, China;2. AVIC Xi?an Aircraft Industry (Group) Company Ltd., Xi?an, Shaanxi 710089, China;1. Metallurgical &Materials Engineering. Indian Institute of Technology Kharagpur, 721302, India;2. CSIR-National Metallurgical Laboratory, Jamshedpur, Jharkhand 831007, India;3. Defence Metallurgical Research Laboratory, DRDO, Hyderabad 500058, India
Abstract:Fatigue crack growth behaviour of Ti–6Al–2Zr–1.5Mo–1.5V (VT-20 a near-α Ti alloy) was studied in lamellar, bimodal and acicular microstructural conditions. Fatigue crack growth tests at both increasing and decreasing stress intensity factor range values were performed at ambient temperature and a loading ratio of 0.3 using compact tension samples. Lamellar and acicular microstructures showed lower fatigue crack growth rates as compared to the bimodal microstructure due to the tortuous nature of cracks in the former and the cleavage of primary α in the latter. The threshold stress intensity factor range was highest for acicular microstructure.
Keywords:Fatigue crack growth  Effect of microstructure  Titanium alloy  Fatigue threshold  VT-20
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