Journal Published Online: 02 August 2024
Volume 13, Issue 1

Processing-Microstructure-Mechanical Property Paradigm in Hot Rolled Ti-6Al-4V Alloy

CODEN: MPCACD

Abstract

The effects of hot rolling temperature and subsequent cooling at different cooling rates on the microstructure, texture, and mechanical properties of α + β titanium alloy Ti-6Al-4V were studied using a battery of structural and mechanical characterization tools. To this end, Ti-6Al-4V samples were subjected to a rolling reduction of 50 % below the β-transus (750°C and 850°C) and near the β-transus (950°C) temperature followed by water quenching and air cooling. Detailed electron back scatter diffraction provided information on the fraction, morphology, and orientation of the alpha and β-phases for different processing conditions and bulk texture analysis provided information on the orientation relationship at the macroscale. Mechanical properties, like hardness and modulus, were determined at different length scales using the Vickers microhardness experiment, instrumented microindentation, and nanoindentation. Hot rolling at sub β-transus temperatures (750°C and 850°C) leads to the equiaxed morphology of the α-phase and the absence of a Burgers orientation relationship (BOR) with the β-phase, whereas near the β-transus, hot rolling leads to the multi-variant lamellar morphology of the α-phase and a strong BOR with the β-phase for both the cooling conditions. Hot rolling at 850°C followed by water quenching showed an optimum combination of indentation hardness and modulus. This has been primarily attributed to the relatively low kernel average misorientation of the basal-prism-oriented grains compared with the prism-pyramidal oriented grains after indentation. The basal oriented grains are both elastically and plastically harder compared with the prism-oriented grains that are elastically soft but plastically hard. The orientation specific indentation hardness property is reflected in the microhardness property for sub β-transus deformed samples. A clear processing-microstructure-texture-mechanical property paradigm in the context of variant selection and distinct cooling rates for hot rolling of Ti-6Al-4V is established.

Author Information

Paliwal, Deepak
Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur, India
Jha, Sumit
Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur, India
Raturi, Abheepsit
Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur, India
Ghosh, Atasi
Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur, India
Bandyopadhyay, Soumya
Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur, India
Pandey, Vivek Kumar
Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur, India
Anoop, C. R.
Liquid Propulsions Systems Centre Valiamala (ISRO), Thiruvananthapuram, India
Narayanan, P. Ramesh
Materials and Mechanical Entity, Vikram Sarabhai Space Centre, Trivandrum, India
Mukherjee, Rajdip
Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur, India
Gurao, Nilesh Prakash
Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur, India
Pages: 21
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Stock #: MPC20230086
ISSN: 2379-1365
DOI: 10.1520/MPC20230086