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Quantifying the progression of dynamic recrystallization in severe shear deformation at high strain rates

Published online by Cambridge University Press:  01 August 2013

Sepideh Abolghasem ,
Saurabh Basu  and
M. Ravi Shankar
Sepideh Abolghasem
Affiliation:
Swanson School of Engineering, Department of Industrial Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
Saurabh Basu
Affiliation:
Swanson School of Engineering, Department of Industrial Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
M. Ravi Shankar*
Affiliation:
Swanson School of Engineering, Department of Industrial Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
*
a)Address all correspondence to this author. e-mail: ravishm@pitt.edu
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Abstract

This paper examines the onset and progression of dynamic recrystallization (DRX) phenomena under shear deformation conditions characterized by strains >1 and strain rates >102/s by purposing large strain machining (LSM) as a test of microstructure response. To accomplish this, samples are created using LSM while characterizing the deformation using digital image correlation and infrared thermography. Microstructural consequences resulting from the characterized thermomechanical conditions are examined using electron backscattered diffraction. The progression of DRX is measured by identifying the threshold of grain orientation spread demarcating the onset of recrystallization and utilizing this threshold to segregate the microstructure and quantify the extent of DRX. A model for the onset of DRX as a function of thermomechanics of deformation is presented. This characterization can help understand surface microstructures resulting from shear-based manufacturing processes, such as turning, milling, shaping, etc., that are created under analogous thermomechanical conditions.

Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 15 , 14 August 2013 , pp. 2056 - 2069
Copyright
Copyright © Materials Research Society 2013 

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