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Production of fine-grained foils by large strain extrusion-machining of textured Ti–6Al–4V

Published online by Cambridge University Press:  18 December 2017

Karthik Palaniappan ,
H. Murthy  and
Balkrishna C. Rao
Karthik Palaniappan
Affiliation:
Department of Engineering Design, IIT Madras, Chennai-600 036, India
H. Murthy
Affiliation:
Department of Aerospace Engineering, IIT Madras, Chennai-600 036, India
Balkrishna C. Rao*
Affiliation:
Department of Engineering Design, IIT Madras, Chennai-600 036, India
*
a)Address all correspondence to this author. e-mail: balkrish@iitm.ac.in
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Abstract

The large strain extrusion-machining process has been used to refine the microstructure in a Titanium alloy (Ti–6Al–4V). The unconstrained cutting or machining of Ti–6Al–4V entails the formation of shear localized chips at nearly all cutting speeds, thereby hindering the use of extrusion-machining to produce fine-grained materials. The present effort attempts to suppress shear localization by the suitable modification of texture in Ti–6Al–4V through the cold-rolling process prior to extrusion-machining. Ti–6Al–4V plates were cold rolled to 30, 40, 45, and 47% thickness reductions. These textured plates were extrusion machined using a suitably designed fixture leading to fine-grained continuous foils with increased hardness. Microscopy has revealed that the suppression of shear localization in the foils produced from plates which are cold rolled to more than 40% of thickness reduction is triggered by texture formation. For thickness reductions slightly lower than 40% (e.g., 30%), suppression can be achieved only by a combination of texture and extrusion.

Keywords

Timachiningtexture
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 2 , 29 January 2018 , pp. 108 - 120
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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