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TECHNICAL PAPERS

Experimentally Based Study on the Effect of Initial Grain Size for Characterization of the Grain Coarsening Phenomenon During Hot Rolling of a Medium Carbon Steel

[+] Author and Article Information
Yutaka Neishi, Kouichi Kuroda

Bar & Wire Processing Development Section, Corporate Research and Development Laboratories, Sumitomo Metal Industries, Ltd., 1, Konomimachi, Kokurakita-ku, Kitakyusyu-city, Fukuoka, 802-8686, Japan

Masayoshi Akiyama

Corporate Research and Development Laboratories, Sumitomo Metal Industries, Ltd., 1-8, Fuso-cho, Amagasaki-city, Hyogo, 660-0891, Japan

J. Manuf. Sci. Eng 122(1), 109-116 (Jun 01, 1999) (8 pages) doi:10.1115/1.538912 History: Received September 01, 1998; Revised June 01, 1999
Copyright © 2000 by ASME
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References

Ammerling,  W. J., 1988, “Application of 3-roll Technology for Rolling Specialty Rod and Bar Products,” Iron and Steel Eng., 65, pp. 22–27.
Sakurai, T., Yamanaka, E., Kondo, H., Takeda, R., Karino, A., and Kunita, N., 1995, “Development of 4-roll Size-Free Rolling Technology for Bar Mill Line,” July, SEAISI 39th Conference on Recent Development of Rolling and Following Process Technology and/or Application of Steel Products, pp. 59–70.
Tokunaga,  Y., Mizuyama,  Y., Inoue,  M., and Yamada,  M., 1984, “Occurrence of Coarse Grains in Hot-rolled Low Carbon Aluminum Killed Steel Sheets Coiled at High Temperature,” Tetsu to Hagane, 70-15, pp. 2136–2143.
Edwards,  G. A., and Pfeil,  L. B., 1924, “The Production of Large Crystals by Annealing Strained Iron,” J. Iron Steel Inst., London, 190, pp. 129–147.
Neishi,  Y., Akiyama,  M., Inoue,  Y., and Kawakami,  K., 1997, “Development of Control Rolling Process for Suppressing Grain Coarsening of Rod and Bar,” J. Jpn. Soc. Technol. Plast., 38, pp. 637–641.
Neishi,  Y., Akiyama,  M., Kuroda,  K., Inoue,  Y., and Kawakami,  K., 1998, “Determination of Hot Sizing Conditions for Bar Rolling to Suppress the Grain Coarsening Phenomenon,” Wire J. Intl., January, 31, pp. 92–97.
Neishi,  Y., Akiyama,  M., and Kuroda,  K., 1998, “Effect of Accumulated Equivalent Plastic Strain on Grain Coarsening Phenomenon in Multistage Hot Deformation Process,” J. Jpn. Soc. Technol. Plast., 39, pp. 1134–1138.
Misaka,  Y., and Yoshimoto,  T., 1966, “Formularization of Resistance to Deformation of Plain Carbon Steels at Elevated Temperature,” Tetsu to Hagane, 52, pp. 1584–1587.
Yanagimoto, J., Kiuchi, M., and Inoue, Y., 1993, “Characterization of Wire and Rod Rolling with Front and Back Tensions by Three Dimensional Rigid-Plastic Finite Element Method,” in Proceedings of 4th ICTP, pp. 764–769.

Figures

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Illustrated example of mill layout for bar rolling
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Distribution of grain size in the mother bar
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Photograph of the hot deformation simulator
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Example of calculated distribution of equivalent plastic strain after the compression test
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Effects of temperature, equivalent plastic strain, and holding time on the grain size after cooling
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Illustration of experimental stages to simulate the grain coarsening phenomenon for various initial grain size
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Comparisons of deformed microstructures
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Effect of temperature, equivalent plastic strain and initial grain size number on the grain coarsening phenomenon. Initial grain size number: (a) 3.5, (b) 6.0, (c) 7.5.
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Three-dimensional illustration of the effect of temperature and equivalent plastic strain on the grain coarsening phenomenon at 1123 K. Initial grain size number: (a) 3.5, (b) 6.0, (c) 7.5.
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The change in the grain size number on the equivalent plastic strain at 1173 K
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Illustrated layout of a prototype mill
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Example of finite-element analyses by “CORMILL”
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Effect of initial grain size on the grain coarsening phenomenon after finishing rolling

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