Effect of Annealing Treatment on Mechanical and Magnetic Softening Behaviors of Cold Rolled Interstitial-Free Steel
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JMEPEG https://doi.org/10.1007/s11665-019-03953-z
Effect of Annealing Treatment on Mechanical and Magnetic Softening Behaviors of Cold Rolled Interstitial-Free Steel Siuli Dutta, V. Rajinikanth, Ashis K. Panda, Amitava Mitra, Subrata Chatterjee, and Rajat K. Roy (Submitted June 18, 2018; in revised form January 1, 2019) The recovery and recrystallization behaviors of low-carbon interstitial-free steel are investigated at different annealing temperatures (200-690 °C) through correlation between the changes in magnetic parameters (coercivity and r.m.s. voltage), hardness, tensile strength and high-angle grain boundary fractions (HAB). Magnetic parameters and tensile strength show a significant change within recovery region (200-500 °C), while the hardness variation is very minimal at this temperature region. On the other hand, the hardness is abruptly changed compared to magnetic properties at higher annealing temperature (550-640 °C). The grain boundary characteristics and microtexture evolution occurring at recrystallization regime are evaluated by orientation imaging microscopy (OIM) and orientation distribution function (ODF) through electron backscattered diffraction (EBSD). The increase in recrystallization fraction noticeably affects microtexture property, justifying with the strengthening of c-fiber, weakening of a-fiber and disappearance of rotated cube component with increasing annealing temperatures. Keywords
coercivity, hardness, interstitial-free steel, magnetic softening, microtexture, recrystallization, tensile strength
1. Introduction Low-carbon interstitial-free (IF) steel is widely used in automobile applications due to its excellent formability, which is related to a strong c-fiber texture of {111} (Ref 1, 2). Since the formability in steel is developed during annealing treatment of cold rolled steel, an understanding of recrystallization behaviors is prerequisite for the production of good quality IF steel. The recovery and recrystallization kinetics are evaluated using different techniques such as x-ray diffraction, thermal analysis, microscopy, electrical resistivity, hardness and magnetic measurements (Ref 3-9). Among these methods, the microscopy is the direct analysis of recrystallized microstructures and the analyzed parameters are phase balance, grain size, precipitate size and recrystallized fraction, which play a crucial role in controlling the steel properties. The magnetic parameters (coercivity, remanence, initial permeability, maximum differential permeability, magnetic induction, hysteresis loss and R.M.S. voltage etc.) have been found good correlation with microstructural parameters of grain size (Ref 10), second-phase particles, inclusions and mechanical properties of tensile Siuli Dutta, AMP and MTE Division, CSIR-NML, Jamshedpur 831007, India; and School of Materials Science and Engineering, IIEST, Shibpur, Howrah 731003, India; V. Rajinikanth, Ashis K. Panda, Amitava Mitra, and Rajat K. Roy, AMP and MTE Division, CSIR-NML, Jamshedpur 831007, India; Subrata Chatterjee, School of Ma
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