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Effect of Grain Boundary Alpha on Mechanical Properties of Ti5.4Al3Mo1V Alloy

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The article brings out the correlation between the microstructure and mechanical properties of Ti5.4Al3Mo1V (VT14 alloy) high‐strength alpha beta titanium alloy. The specimens were solution treated above the beta transus temperature of the alloy (980°C and 1000°C) for 45 min and cooled at different rates (water quenched, air cooled, and furnace cooled) to ambient temperature. The specimens were polished, and the microstructural observations under optical microscopy resulted in a discontinuous alpha phase and a continuous network of alpha for 980°C and 1000°C beta-annealed conditions, respectively. Mechanical properties like tensile and impact were evaluated for a 980°C beta-annealed condition. The fracture morphology features of failed impact specimens were compared with a mill annealed product. From the tensile strength data, it was observed that the strength achieved is maximum in the water‐quenched condition (1291–1308 MPa) and lowest in the furnace‐cooled condition (895–905 MPa), whereas the impact strength is highest in the furnace-cooled condition (8.03–8.7 gm/cm2), which is comparable with the air-cooled condition (7.3–8.5 kg/cm2), and lowest for the water–quenched condition (2.5–3.1 kg/cm2). The current study is an attempt to correlate the mechanical properties to the heat treatment and thereby to the microstructure.

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Acknowledgement

The authors wish to acknowledge the support, encouragement, and guidance provided by Director, Vikram Sarabhai Space Centre, during the course of development work.

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Authors and Affiliations

  1. Materials and Mechanical Entity, Vikram Sarabhai Space Centre, Trivandrum, 695022, India

    Kurnala Naresh Kumar, Pravin Muneshwar, Satish Kumar Singh, Abhay K. Jha, Bhanu Pant & Koshy M. George

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  1. Kurnala Naresh Kumar
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  2. Pravin Muneshwar
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  3. Satish Kumar Singh
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  4. Abhay K. Jha
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  5. Bhanu Pant
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  6. Koshy M. George
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Correspondence to Kurnala Naresh Kumar.

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Kumar, K.N., Muneshwar, P., Singh, S.K. et al. Effect of Grain Boundary Alpha on Mechanical Properties of Ti5.4Al3Mo1V Alloy. JOM 67, 1265–1272 (2015). https://doi.org/10.1007/s11837-015-1443-3

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  • DOI: https://doi.org/10.1007/s11837-015-1443-3

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