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Effect of Uniaxial Pre-strain on Tensile, Work Hardening, Fracture Toughness, and Fatigue Crack Growth Rate of Titanium Alloy Ti–6Al–4V

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Abstract

In this study, the effect of plastic deformation on strength, work hardening behavior, fracture toughness (FT, JIc), and fatigue crack growth rate (FCGR) of Ti–6Al–4V alloy in annealed condition was studied. Ti–6Al–4V was subjected to uniaxial pre-strain of 0.5, 1, 2, 3, 4, and 5 pct and tensile, JIc and FCGR specimens were extracted from the pre-strained material. X-ray diffraction analysis revealed peak broadening with increasing strain. Both the ultimate tensile strength (UTS) and yield strength (YS) were found to significantly increase with increasing pre-strain, whereas the ductility was retained up to 4 pct pre-strain. Beyond 4 pct pre-strain, the ductility decreased drastically. Strain hardening exponent, work hardening rate, and maximum work hardening decreased with increasing uniaxial pre-strain. This study revealed that, up to 1 pct pre-strain, the JIc values get slightly affected, beyond which they get significantly reduced. Resistance to fatigue crack propagation was significantly lowered for pre-strained specimens. No significant FCGR variations were observed among specimens subjected to different levels of pre-strains. Pre-strain increases misorientation accumulation, average misorientation and dislocation density, which resulted in an increase in both YS and UTS and a decrease in the ductility significantly. Increase in deformation heterogeneity was observed at higher pre-strains due to the evolution of deformation texture. Textured region increases plastic strain heterogeneities and alters the mechanism of crack initiation and crack propagation. Pre-strain significantly influences FT and FCGR properties of this alloy.

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Acknowledgments

The authors are also thankful to Director, Vikram Sarabhai Space Centre (Trivandrum, India), for the kind permission to publish this article.

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On behalf of all authors, the corresponding author states that there is no conflict of interest.

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Authors and Affiliations

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

    K. Saravanan, P. Manikandan, K. Jalaja, V. M. J. Sharma, G. Sudarshan Rao & A. Venugopal

  2. Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Mumbai, Maharashtra, 400076, India

    Namit Pai

  3. Materials and Manufacturing Entity, Liquid Propulsion System Centre, ISRO, Trivandrum, Kerala, 695022, India

    S. V. S. Narayana Murty

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  1. K. Saravanan
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Saravanan, K., Manikandan, P., Jalaja, K. et al. Effect of Uniaxial Pre-strain on Tensile, Work Hardening, Fracture Toughness, and Fatigue Crack Growth Rate of Titanium Alloy Ti–6Al–4V. Metall Mater Trans A 54, 3603–3619 (2023). https://doi.org/10.1007/s11661-023-07117-6

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