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Microstructure and Texture Evolution During Sub-Transus Thermo-Mechanical Processing of Ti-6Al-4V-0.1B Alloy: Part II. Static Annealing in (α + β) Regime

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Abstract

The first part of this study describes the evolution of microstructure and texture in Ti-6Al-4V-0.1B alloy during sub-transus rolling vis-à-vis the control alloy Ti-6Al-4V. In the second part, the static annealing response of the two alloys at self-same conditions is compared and the principal micromechanisms are analyzed. Faster globularization kinetics has been observed in the Ti-6Al-4V-0.1B alloy for equivalent annealing conditions. This is primarily attributed to the α colonies, which leads to easy boundary splitting via multiple slip activation in this alloy. The other mechanisms facilitating lamellar to equiaxed morphological transformations, e.g., termination migration and cylinderization, also start early in the boron-modified alloy due to small α colony size, small aspect ratio of the α lamellae, and the presence of TiB particles in the microstructure. Both the alloys exhibit weakening of basal fiber (ND||〈0001〉) and strengthening of prism fiber (RD||〈\( 10\bar{1}0 \)〉) upon annealing. A close proximity between the orientations of fully globularized primary α and secondary α phases during α → β → α transformation has accounted for such a texture modification.

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  1. JXA-8530F, JEOL, Japan.

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Acknowledgments

The authors acknowledge the Institute Nanoscience Initiative (INI) and Institute X-ray Facility at the Indian Institute of Science, Bangalore, India, and the National facility for orientation imaging microscopy and X-ray bulk texture at the Indian Institute of Technology Bombay for providing the required research facilities. The materials used for the study were originally provided by Dr. Dan Miracle of AFRL and Dr. S. Tamirisakandala of FMW Composites. The authors are thankful to Mr. Nataraj B.R., Mr. Ashranth, Mr. Atanu Chowdhury, and Mr. Nachiketa Ray for microstructural measurements.

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Authors and Affiliations

  1. Department of Materials Engineering, Indian Institute of Science, Bangalore, India

    Shibayan Roy (formerly Ph.D. Student, Post-doctoral Researcher), S. Karanth (Summer Trainee) & Satyam Suwas (Associate Professor)

  2. Institut für Werkstoffwissenschaft und Werkstofftechnik, Chemnitz University of Technology, Chemnitz, Germany

    Shibayan Roy (formerly Ph.D. Student, Post-doctoral Researcher)

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  1. Shibayan Roy
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Correspondence to Satyam Suwas.

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Manuscript submitted May 31, 2012.

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Roy, S., Karanth, S. & Suwas, S. Microstructure and Texture Evolution During Sub-Transus Thermo-Mechanical Processing of Ti-6Al-4V-0.1B Alloy: Part II. Static Annealing in (α + β) Regime. Metall Mater Trans A 44, 3322–3336 (2013). https://doi.org/10.1007/s11661-013-1673-3

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