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- Title
Formation of Ultrafine Cellular Microstructure Around Alumina Particles in a Low-Carbon Steel.
- Authors
Kang, Jun-Yun; Lee, Sang; Cho, Yi-Gil; Kim, Seul; Cho, Hoon-Hwe; Han, Heung; Oh, Kyu
- 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.
- Subjects
ALUMINUM oxide; MILD steel; PHASE transitions; FINITE element method; COOLING; PHYSIOLOGICAL effects of hydrostatic pressure
- Publication
Metallurgical & Materials Transactions. Part A, 2013, Vol 44, Issue 9, p4098
- ISSN
1073-5623
- Publication type
Article
- DOI
10.1007/s11661-013-1753-4