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High-Pressure Double Torsion as a Severe Plastic Deformation Process: Experimental Procedure and Finite Element Modeling

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Abstract

In the present study, a severe plastic deformation process of high-pressure torsion (HPT) has been modified. The new process is called high-pressure double torsion (HPDT) as both anvils of the conventional HPT process rotate in opposite directions. We manufactured sets of aluminum and pure copper samples using both the HPT process and the newly developed HPDT process to compare between microstructures and microhardness values. Our investigations showed that the copper samples processed by HPDT exhibited larger gradients in microstructure and higher values of hardness. Subsequently, we carried out a set of finite element simulations in ABAQUS/explicit to better understand the differences between the HPT process and the HPDT process. A comparison of the strain distributions of the HPT and HPDT samples revealed a decreasing trend in strain values as the radius increased at the middle surface of the samples. Analysis of the equivalent stress values revealed that stress values for the HPDT samples were higher than those of the HPT samples. Finally, the comparison of the max principal stress values indicated that in the HPDT sample, the extent of the compressive stresses was larger than those in the HPT sample.

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Acknowledgments

MJ and MHP would like to acknowledge the financial support of Shiraz University through Grant Number 90-GR-ENG-16. The authors are indebted to all the technicians from the Fars Industrial Estate and are grateful for their technical input and support in 2012. During this time, the HPT machine was manufactured at Shiraz University. MK was supported by faculty start-up funds from the University of New Hampshire.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of New Hampshire, Durham, NH, 03824, USA

    Mohammad Jahedi & Marko Knezevic

  2. Department of Materials Science and Engineering, School of Engineering, Shiraz University, Zand Ave., Shiraz, Iran

    Mohammad Jahedi & Mohammad Hossein Paydar

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  1. Mohammad Jahedi
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  2. Marko Knezevic
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  3. Mohammad Hossein Paydar
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Correspondence to Mohammad Hossein Paydar.

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Jahedi, M., Knezevic, M. & Paydar, M.H. High-Pressure Double Torsion as a Severe Plastic Deformation Process: Experimental Procedure and Finite Element Modeling. J. of Materi Eng and Perform 24, 1471–1482 (2015). https://doi.org/10.1007/s11665-015-1426-0

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  • DOI: https://doi.org/10.1007/s11665-015-1426-0

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