Modeling and Optimization of Cross-Sectional Microstructure Distribution during Hot Rolling of HSLA Steel Plates

Abstract:

The metallurgical equations have been implemented into the finite difference model to predict the microstructure evolution at different locations in the plate cross-section. Recrystallization kinetics and grain size distributions instead of average grain size values were computed for different rolling schedules. For 20mm plate, the austenite grain sizes at the surface are smaller than at the center, with the exception of the conner where there are the largest grain sizes in throughout cross-section, and the smallest grain sizes can be found near the end of the horizontal central line. The fine austenite grain size and relatively high retained strain could be obtained by modifying rolling practice, such as changing the temperature and thickness at the entrance of finishing rolling and adopting intermediate water cooling. The ferrite grain size and its distribution have a good agreement with the measurements.

• Periodical: Materials Science Forum (Volumes 638-642)
• Pages: 2736-2742
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.638-642.2736
• Online since: January 2010
• Authors: Yun Bo Xu, Tian Yong Deng, Yong Mei Yu, Xiao Ying Hou, Xianghua Liu, Guo Dong Wang
• Keywords: Finite Difference, Grain Size Distribution, Metallurgical Equation, Micro-Structure Evolution, Recrystallization Kinetics

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