Abstract
Ultrafine cellular microstructures around alumina particles in a low-carbon steel were observed, which survived even after cyclic austenitization. This indicates that their formation is closely related to internal stress because of a structural heterogeneity during phase transformation rather than to externally applied forces or deformation. Thermo-elasto-plastic finite element analysis confirmed the evolution of a large hydrostatic pressure around an alumina particle due to thermal mismatch during cooling. Therefore, the fine cellular microstructure might be generated as a result of the hydrostatic pressure, which retards the phase transformation around the particle during cooling. In addition, we observed microstructural similarity with the same steel processed under an ultra-high pressure, which was the evidence for the role of the delay in the transformation caused by the hydrostatic pressure.
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Acknowledgments
The authors gratefully acknowledge the financial support by the POSCO (2012Z035) and a grant from the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Knowledge Economy, the Republic of Korea (2012-10041169). J.-Y. Kang and H.N. Han would like to thank Dr. C.-S. Oh and Dr. T.-H. Lee in Korea Institute of Materials Science, Mr. J.-O. Oh in ILJIN Diamond Co. Ltd., and Dr. H.-C. Lee in the Graduate Institute of Ferrous Technology for the helpful discussion and the allowing the use of their HTHP apparatus.
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Manuscript submitted December 4, 2012.
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Kang, JY., Lee, S.H., Cho, YG. et al. Formation of Ultrafine Cellular Microstructure Around Alumina Particles in a Low-Carbon Steel. Metall Mater Trans A 44, 4098–4105 (2013). https://doi.org/10.1007/s11661-013-1753-4
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DOI: https://doi.org/10.1007/s11661-013-1753-4