PSI - Issue 71

T. Vivekananda Swamy et al. / Procedia Structural Integrity 71 (2025) 111–117

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SEM Observation from two fractured specimens subjected to HCF loading at RT shows surface crack initiation. The crack initiation sites moved to the interior of the specimens, with the results obtained from another two specimens subjected to HCF loading at 150 ℃. 4. Conclusions • The fatigue strength of the Ti-6Al-4V alloy under study is reduced at 150 ℃ . • At a low number of cycles (<10 5 ), the effect of temperature on fatigue life is significant as compared to the high number of cycles (>10 5 ). • In comparison with RT, the fractured surfaces show that the crack initiation has shifted to the interior of the specimens tested at 150 ℃. • No fatigue striations or secondary cracks are observed at a stress value of 1000 MPa at 150 ℃ . Acknowledgements This work is a part of the funded project by the Gas Turbine Research Establishment, Bangalore, 560093, India. References Alexander Janda, Stefan Ebenbauer, Aude Prestl, Ingo Siller, Helmut Clemens a, Petra Spoerk Erdely., 2022. In-situ high-temperature EBSD characterization during a solution heat treatment of hot-rolled Ti-6Al-4. Materials Characterization 192, 112207 G.Q. Wu, C.L. Shi, W. Sha, A.X. Sha, H.R. Jiang, 2013. Effect of microstructure on the fatigue properties of Ti – 6Al – 4V titanium alloys. Materials and Design 46, 668 – 674 J. Ding, R. Hall, J. Byrne, 2005. Effects of stress ratio and temperature on fatigue crack growth in a Ti – 6Al – 4V alloy. International Journal of Fatigue 27, 1551 – 1558 K. Takoji, 2006. High cycle fatigue behaviour of Ti – 6Al – 4V alloy at elevated temperatures. ScriptaMaterialia 54, 2143 – 2148. Leyens C, Peters M., editors. 2003. Titanium and titanium alloys: fundamentals and applications. Weinheim: Wiley-VCH. Sandeep Kale, M. M. Thawre, Atul Ballal, D. R. Peshwe, Abhilasha Jain, Priyadarshini Bais, Aritra Sarkar, A. Nagesha. 2022. High‑Temperature Fatigue Behaviour of Alloy 617M.Transactions of the Indian National Academy of Engineering 7, 685 – 688 R. J. H. Wanhill, R. Galatolo and C. E. W. Looije. Fractographic and microstructural analysis of fatigue crack growth in a Ti-.6A1-4V fan disc forging. X.P. Jiang, C.-S. Man, M.J. Shepard, T. Zhai, 2007. Effects of shot-peening and re-shot-peening on four-point bend fatigue behavior of Ti – 6Al – 4V. Materials Science and Engineering A 468 – 470, 137 – 143. Zhihong Wu, Hongchao Kou, Luyao Tang, Wei Chen, Xiaoning Han, Ying Deng, Bin Tang, Jinshan Li., 2020. Microstructural effects on the high-cycle fatigue and fracture behaviours of Ti-6Al-4V alloy. Engineering Fracture Mechanics 235, 107129.