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Metals 2019, 9(3), 370; https://doi.org/10.3390/met9030370

The Influence of Mg-Based Inclusions on the Grain Boundary Mobility of Austenite in SS400 Steel

1
Department of Materials Science and Engineering, National Cheng-Kung University, Tainan 701, Taiwan
2
China Steel Corporation, Kaohsiung 81233, Taiwan
3
Department of Mechanical Engineering, National Cheng-Kung University, Tainan 701, Taiwan
*
Author to whom correspondence should be addressed.
Received: 23 January 2019 / Revised: 14 March 2019 / Accepted: 20 March 2019 / Published: 22 March 2019
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Abstract

In this study, the effects of the addition of Mg to the grain growth of austenite and the magnesium-based inclusions to mobility were investigated in SS400 steel at high temperatures. A high-temperature confocal scanning laser microscope (HT-CSLM) was employed to directly observe, in situ, the grain structure of austenite under 25 torr Ar at high temperatures. The grain size distribution of austenite showed the log-normal distribution. The results of the grain growth curves using 3D surface fitting showed that the n and Q values of the growth equation parameters ranged from 0.2 to 0.26 and from 405 kJ/mole to 752 kJ/mole, respectively, when adding 5.6–22 ppm of Mg. Increasing the temperature from 1150 to 1250 °C for 20 min and increasing the addition of Mg by 5.6, 11, and 22 ppm resulted in increases in the grain boundary velocity. The effects of solute drag and Zener pinning on grain boundary mobility were also calculated in this study. View Full-Text
Keywords: confocal scanning laser microscope; grain growth; magnesium addition; low-carbon steel; mobility; pinning effect confocal scanning laser microscope; grain growth; magnesium addition; low-carbon steel; mobility; pinning effect
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Lai, C.-T.; Lai, H.-H.; Su, Y.-H.F.; Huang, F.-Y.; Lin, C.-K.; Kuo, J.-C.; Lee, H.-T. The Influence of Mg-Based Inclusions on the Grain Boundary Mobility of Austenite in SS400 Steel. Metals 2019, 9, 370.

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