CORRELATION BETWEEN MICROSTRUCTURE AND FATIGUE PROPERTY OF TI-6AL-4V ALLOY USED IN AEROSPACE APPLICATIONS

Document Type : Original Article

Authors

1 Researcher, Manufacturing Technology Dept., CMRDI, Cairo, Egypt.

2 Graduate student, Materials science and Engineering Dept., TU-Clausthal, Germany.

3 Professor, Materials science and Engineering Dept., TU-Clausthal, Germany.

Abstract

Ti-6Al-4V is one of the most commonly used titanium alloys in the aviation industry due to its high strength-to-weight ratio, high operating temperature, and corrosion resistance. In this study, two batches of Ti-6.3Al-4.17V samples were subjected to different thermomechanical processes. The first batch was treated below the β-transus temperature (980 °C) to get duplex structure (α+β), while the second batch was treated above β-transus temperature (1050 °C) to get lamellar structure. Rotating bending fatigue test was carried out using electropolishing surface condition. It is observed that the treatment above β-transus showed higher fatigue limit than the samples treated below the β-transus. This is attributed to the fine structure (lamellar structure) obtained at 1050 °C than the duplex structure (α+β) obtained at 980 °C. In addition, the fatigue crack initiation sites existing in the structures were determined.

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