Anisotropic pinning-effect of inclusions in Mg-based low-carbon steel

Chi Kang Lin, Hsuan Hao Lai, Yen Hao Frank Su, Guan Ru Lin, Weng Sing Hwang, Jui-Chao Kuo

Research output: Contribution to journalArticle

Abstract

In this study, the effect of austenite grain size on acicular ferrite (AF) nucleation in low-carbon steel containing 13 ppm Mg is determined. The average austenite grain size was calculated using OM Leica software. Results show that the predicted and experimental values of austenite grain size are extremely close, with a deviation of less than 20 μm. AF formation is difficult to induce by either excessively small and large austenite grain sizes; that is, an optimal austenite grain size is required to promote AF nucleation probability. The austenite grain size of 164 μm revealed the highest capacity to induce AF formation. The effects of the maximum distance of carbon diffusion and austenite grain size on the microstructure of Mg-containing low carbon steel are also discussed. Next, the pinning ability of different inclusion types in low-carbon steel containing 22 Mg is determined. The in situ observation shows that not every inclusion could inhibit austenite grain migration; the inclusion type influences pinning ability. The grain mobility of each inclusion was calculated using in situ micrographs of confocal scanning laser microscopy (CSLM) for micro-analysis. Results show that the austenite grain boundary can strongly be pinned by Mg-based inclusions. MnS inclusions are the least effective in pinning austenite grain boundary migration.

Original languageEnglish
Article number2241
JournalMaterials
Volume11
Issue number11
DOIs
Publication statusPublished - 2018 Nov 11

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Low carbon steel
Austenite
Ferrite
Grain boundaries
Nucleation
Microanalysis
Microscopic examination
Carbon
Scanning
Microstructure
Lasers

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Lin, C. K., Lai, H. H., Su, Y. H. F., Lin, G. R., Hwang, W. S., & Kuo, J-C. (2018). Anisotropic pinning-effect of inclusions in Mg-based low-carbon steel. Materials, 11(11), [2241]. https://doi.org/10.3390/ma11112241
Lin, Chi Kang ; Lai, Hsuan Hao ; Su, Yen Hao Frank ; Lin, Guan Ru ; Hwang, Weng Sing ; Kuo, Jui-Chao. / Anisotropic pinning-effect of inclusions in Mg-based low-carbon steel. In: Materials. 2018 ; Vol. 11, No. 11.
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abstract = "In this study, the effect of austenite grain size on acicular ferrite (AF) nucleation in low-carbon steel containing 13 ppm Mg is determined. The average austenite grain size was calculated using OM Leica software. Results show that the predicted and experimental values of austenite grain size are extremely close, with a deviation of less than 20 μm. AF formation is difficult to induce by either excessively small and large austenite grain sizes; that is, an optimal austenite grain size is required to promote AF nucleation probability. The austenite grain size of 164 μm revealed the highest capacity to induce AF formation. The effects of the maximum distance of carbon diffusion and austenite grain size on the microstructure of Mg-containing low carbon steel are also discussed. Next, the pinning ability of different inclusion types in low-carbon steel containing 22 Mg is determined. The in situ observation shows that not every inclusion could inhibit austenite grain migration; the inclusion type influences pinning ability. The grain mobility of each inclusion was calculated using in situ micrographs of confocal scanning laser microscopy (CSLM) for micro-analysis. Results show that the austenite grain boundary can strongly be pinned by Mg-based inclusions. MnS inclusions are the least effective in pinning austenite grain boundary migration.",
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Anisotropic pinning-effect of inclusions in Mg-based low-carbon steel. / Lin, Chi Kang; Lai, Hsuan Hao; Su, Yen Hao Frank; Lin, Guan Ru; Hwang, Weng Sing; Kuo, Jui-Chao.

In: Materials, Vol. 11, No. 11, 2241, 11.11.2018.

Research output: Contribution to journalArticle

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