Microstructure evolution modeling of squarediamond pass hot bar rolling of AISI 4135 steel

Ho-Won Lee¹, Hyuck-Cheol Kwon², Yong-Taek Im¹, Peter D. Hodgson³

¹National Research Laboratory for Computer Aided Materials Processing, Department of Mechanical Engineering,School of Mechanical, Aerospace & Systems Engineering, ME 3227, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea.
²Rolling Technology and Process Research Group, POSCO Technical Research Laboratories, Pohang 790-785, Korea. ³Faculty of Science and Technology, Deakin University, Geelong, Victoria 3217, Australia.

DOI:

https://doi.org/10.7494/cmms.2006.3.0166

Abstract:

In this study, kinetics of the static (SRX) and metadynamic recrystallization (MDRX) of AISI4135 steel was investigated using hot torsion tests. Continuous torsion tests were carried out to determine the critical strain for dynamic recrystallization (DRX). The times for 50% recrystallization of SRX and MDRX were determined, respectively, by means of interrupted torsion tests. Furthermore, austenite grain size (AGS) evolution due to recrystallization (RX) was measured by optical microscopy. With the help of the evolution model established, the AGS for hot bar rolling of AISI4135 steel was predicted numerically. The predicted AGS values were compared with the results using the other model available in the literature and experimental results to verify its validity. Then, numerical predictions depending on various process parameters such as interpass time, temperature, and roll speed were made to investigate the effect of these parameters on AGS distributions for square-diamond pass rolling. Such numerical results were found to be beneficial in understanding the effect of processing conditions on the microstructure evolution better and control the rolling processes more accurately.

Cite as:

Lee, H., Kwon, H., Im, Y., Hodgson, P. (2006). Microstructure evolution modeling of squarediamond pass hot bar rolling of AISI 4135 steel. Computer Methods in Materials Science, 6(3-4), 140 – 149. https://doi.org/10.7494/cmms.2006.3.0166

Article (PDF):

Keywords:

Austenite grain size, Recrystallization, Hot bar rolling, Numerical prediction, AISI4135

References: