A novel approach of accurately evaluating residual stress and microstructure of welded electrical steels |
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| Affiliation: | 1. Laboratory of Physical Metallurgy, National Technical University of Athens, Zografos 15780, Greece;2. Department of Electrical Engineering, Technological Educational Institute of Sterea Ellada, Evia 34400, Greece;1. State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, PR China;2. Shanghai Key Laboratory of Digital Manufacture for Thin-Walled Structures, Shanghai Jiao Tong University, Shanghai 200240, PR China;1. Université de Lille, L2EP, 59000 Lille, France;2. Arts et Métiers ParisTech – MSMP, 59000 Lille, France;3. JEUMONT Electric, 59460 Jeumont, France;1. Saarland University, Chair in Nondestructive Testing and Quality Assurance, Campus E3 1, 66123 Saarbrücken, Germany;2. Saarland University, MWW, Campus E3 1, 66123 Saarbrücken, Germany;3. Fraunhofer Institute for Nondestructive Testing (IZFP), Campus E3 1, 66123 Saarbrücken, Germany;1. CanmetMATERIALS, Natural Resources Canada, Hamilton, ON L8P 0A5, Canada;2. Department of Mechanical, Automotive, and Materials Engineering, University of Windsor, Windsor, ON N9B 3P4, Canada;3. Tempel Steel Co., Chicago, IL 60640-1020, USA;1. CanmetMATERIALS, Natural Resources Canada, 183 Longwood Road South, Hamilton, ON L8P 0A5, Canada |
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| Abstract: | In the present research work the determination of residual stress distribution in welded non-oriented electrical steel samples is discussed. Tungsten inert gas was used for the welding method. Residual stress was directly determined through deformation measurements and appropriate math calculations. Two methods were used: the magnetic, non-destructive method of Barkhausen noise and the semi-destructive method of X-ray diffraction. In order to evaluate the accuracy and reliability of the magnetic method applied, the steel samples were subjected to both compressive and tensile stresses and the magnetic noise values were correlated to residual stress values through an appropriate calibration curve. The results were then verified by the XRD method and were further evaluated by examining the microstructure and the mechanical properties of the as received and welded samples through scanning electron microscopy and hardness measurements, respectively. It was found that the deviation between the two methods was within acceptable limits, thus implying potential applicability of the MBN method in non-destructive testing of materials. |
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| Keywords: | Residual stress distribution Non-oriented electrical steels TIG welding Barkhausen noise Magnetic calibration |
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