Variability in Fatigue Life of Near-α Titanium Alloy IMI 834

• Published in: Transactions of the Indian Institute of Metals 2021-04, Vol.74 (4), p.979-989
• Main Authors: Bhandari, Litton, Kumar, Jalaj, Balasundar, I., Arora, Amit
• Format: Article
• Language: English
• Subjects: Aerospace engines; Chemistry and Materials Science; Cooling rate; Corrosion and Coatings; Creep strength; Engine components; Fatigue life; Fatigue strength; Finite element method; Heat treating; Heat treatment; High cycle fatigue; Materials Science; Metal fatigue; Metallic Materials; Original Article; Titanium alloys; Titanium base alloys; Tribology
• ISSN: 0972-2815; 0975-1645
• DOI: 10.1007/s12666-021-02210-z

Most aero-engine components and structures are subjected to life critical fatigue loads during service. Near- α titanium alloy IMI 834 is one candidate aero-engine material that is used as high-pressure compressor discs due to its superior fatigue strength and creep resistance. The effect of heat treatment on the microstructure and high-cycle fatigue behaviour of the material has been studied and reported here. The alloy was solution-heat-treated at 1060 °C and subsequently quenched in different media. A strong effect of quench media (cooling rate) on high-cycle fatigue life has been observed. Fractographic investigations were performed to correlate the fracture micro-mechanism with heat treatment. Further, a generalized stress-life model has been deduced from the fatigue data and integrated with finite element analysis to develop a fatigue model for the alloy.