Influence of changing strain rate on microstructure during hot deformation |
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| Affiliation: | 1. Vaidya laboratory, Advanced Centre for Treatment, Research and Education in Cancer (ACTREC), Tata Memorial Centre (TMC), Kharghar, Navi Mumbai 410210, India;2. Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400085, India;3. Epidemiology and Clinical Trials Unit, Advanced Centre for Treatment, Research and Education in Cancer (ACTREC), Kharghar, Navi Mumbai 410 210, India.;4. Gade Laboratory for Pathology, Institute of Clinical Medicine, University of Bergen, Norway;5. Department of Pathology, Haukeland University Hospital, Bergen, Norway;6. Surgical Oncology, Head and Neck Unit, Tata Memorial Hospital (TMH), Parel, Mumbai, India;7. Department of Pathology, Tata Memorial Hospital (TMH), Parel, Mumbai, India;1. DAMTP, University of Cambridge;2. Mathematics Institute, University of Warwick;3. WMG, University of Warkwick |
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| Abstract: | Hot plane strain compression tests have been carried out on a ferritic stainless steel, commercial purity aluminium and an aluminium 1% magnesium alloy under conditions of constant strain rate and with strain rate changed in a controlled manner from one constant value to another. At constant strain rate, subgrain size and dislocation density inside subgrains are related to flow stress in the manner observed previously on other materials. During and after changes in strain rate, subgrain size and dislocation density are not uniquely related to flow stress. Significant strain intervals after a strain rate change are required to establish the new equilibrium subgrain size. For the alloys, these strain intervals are larger when strain rate is increased than when it is decreased. The opposite is found for the commercial aluminium. This difference in behaviour is explained In terms of the relative rates of glide and climb of dislocations. |
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