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Correlation of Alpha Phase and Its Texture Stability in Heat-Treated Ti-6.5%Al-4.4%V-0.15%Fe Alloy

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Abstract

In the present work, microstructure, texture, and mechanical properties were investigated for the heat-treated two-phase (α + β) titanium alloy samples. Ti-6.5%Al-4.4%V-0.15%Fe alloy samples were heated to three different temperatures (850, 930, and 1066 °C) followed by oil quenching (OQ), air cooling (AC), and furnace cooling (FC), respectively. Primary alpha (αP) and secondary alpha (αS) were dominant in the microstructure, when heat-treated below βT (beta-transus) temperature, i.e., 850 and 930 °C. Widmanstatten α (αWS) and basket-weave α (αBW) were dominant features in the microstructure of the samples heat-treated above the βT, i.e., 1066 °C. Formation of the martensite (α′) was observed in all three cases of the OQ samples. Differences in the volume fraction of the αP and αS were observed in the microstructure due to differences in the heating temperature and cooling rate. Texture developments after heat treatment were measured through the electron back-scatter diffraction (EBSD) technique. Variation in the texture intensity values was observed in the samples heat-treated below the βT which shows the dependence of the texture on the volume fraction of αP and αS. Similarly, formation of the big α colonies causes the changes in the texture when heat-treated above the βT. Grain partitioning of αP and αS in 850 and 930 °C-OQ samples shows a similar type of the texture for both the phases, difference being in the intensity of the texture fibers. Martensite (α′) formation during OQ increased the microhardness, whereas coarsening of grains during FC decreased the microhardness of the samples. There was ~ 23% variation in the modulus of elasticity (E), which depended on the heating temperature and cooling rate.

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Acknowledgments

The authors would like to acknowledge the use of National Facility for Texture and OIM (A DST-IRPHA project), IIT Bombay for EBSD measurements.

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Authors and Affiliations

  1. Department of Advanced Components and Materials Engineering, Sunchon National University, Suncheon-Si, Republic of Korea

    Aman Gupta

  2. Department of Materials Engineering, Indian Institute of Science (IISc), Bangalore, India

    Gyan Shankar

  3. Department of Metallurgical and Materials Engineering, Visvesvaraya National Institute of Technology (VNIT)- Nagpur, Nagpur, Maharashtra, India

    Diksha Mahadule & Rajesh Kisni Khatirkar

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Gupta, A., Shankar, G., Mahadule, D. et al. Correlation of Alpha Phase and Its Texture Stability in Heat-Treated Ti-6.5%Al-4.4%V-0.15%Fe Alloy. J. of Materi Eng and Perform 32, 9599–9613 (2023). https://doi.org/10.1007/s11665-023-07811-x

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