Tailoring the crack-tip microstructure: a novel approach |
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Authors: | Khilesh Kumar Bhandari Arka Mandal Md. Basiruddin Sk Arghya Deb Debalay Chakrabarti |
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Affiliation: | 1. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur, India;2. Department of Civil Engineering, Indian Institute of Technology Kharagpur, Kharagpur, India |
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Abstract: | This investigation demonstrates a way to innovatively modify the ferritic microstructure at a local scale, particularly at the failure prone area such as Charpy V-notch (CVN) root. Tensile pre-strain (PS) up to 6% and 12% were employed before annealing (An) the samples at 650°C for 15?minutes. Ferrite grain size increased sharply and gradually (along the distance ahead of the notch root) within the microstructurally modified region in 6–12% pre-strained and annealed samples, respectively. The critical strain which promotes strain-induced boundary migration (SIBM), was found to be 0.1 which resulted in abnormally coarse ferrite grains. |
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Keywords: | Tensile pre-strain annealing recrystallised microstructure plastic deformation grain boundary migration |
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