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Direct Experimental Observations on Concurrent Microstructure and Magnetic Property Developments in Non-Grain Oriented Electrical Steel |
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| Authors: | S K Shekhawat V Basavaraj V D Hiwarkar R Chakrabarty J Nemade P J Guruprasad K G Suresh R D Doherty I Samajdar |
| Affiliation: | 1. Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Mumbai, 400076, India 2. Global R&D Centre, Crompton Greaves Ltd., Mumbai, 400042, India 3. Department of Aerospace Engineering, Indian Institute of Technology Bombay, Mumbai, 400076, India 4. Department of Physics, Indian Institute of Technology Bombay, Mumbai, 400076, India 5. Department of Materials Science and Engineering, Drexel University, Philadelphia, PA, 19104, USA |
| Abstract: | Non-grain oriented electrical steel, with minor in-grain orientation gradients, was subjected to interrupted tensile deformations and concurrent microtexture, magnetic property and residual stress measurements. After the upper yield point, clear signatures of mechanical stress relief were observed. Changes in orientation gradients led to annihilation of low-angle (1 to 3 deg) boundaries. Prior deformation compressive residual stresses became tensile and magnetic properties improved. Beyond an optimum true strain of 0.01, this boundary annihilation ceased, compressive stresses were generated, and magnetic properties degraded. |
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