Microstructural evolution, recovery and recrystallization kinetics of isothermally annealed ultra low carbon steel

Dutta, Siuli and Panda, A K and Mitra, Amitava and Chatterjee, S and Roy, Rajat K (2020) Microstructural evolution, recovery and recrystallization kinetics of isothermally annealed ultra low carbon steel. Mater. Res. Express , 7 (2020) 016554 .

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Abstract

The recovery and recrystallization kinetics of 80%cold rolled ultra low carbon steel are investigated during isothermally annealing for temperature ranges 350–640 °C as a function of different annealing time. The recovery is assessed by magnetic coercivity (Hc),while the recrystallization is determined by mechanical hardness.At low temperature (350 to 520 °C) annealing, recovery dominates for long time (∼12 000 s),while the annealing at 550 °C/ 900s and 580 °C/ 300s causes the recrystallized nuclei formation . The recovery kinetics is introduced by differential rate equation, explaining the reduction in coercivity with the recovery progress and the variation of an activation energy from41–113 kJmol−1. The recrystallization kinetics is found faster at high annealing temperature 640 °C than 550 and 580 °C based on hardness measurement, justifying by apparent activation energy within 114–190 kJ/mol. Furthermore, the recovery and recrystallization rate increase with different annealing time, consistent to the change of microstructures and grain boundary characteristics evaluated by the orientation imaging microscopy (OIM) of electron backscattered diffraction (EBSD).

Item Type:Article
Official URL/DOI:https://doi.org/10.1088/2053-1591/ab657c
Uncontrolled Keywords:annealing, ultra low carbon steel, coercivity, hardness, recrystallization
Divisions:Material Science and Technology
ID Code:8067
Deposited By:Dr Rajat Roy
Deposited On:16 Jan 2020 11:00
Last Modified:16 Jan 2020 11:00

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