Graphitization of Spray-formed Ultrahigh Carbon Steels Containing Si during Hot Rolling

Abstract

Abstract: The graphitization behavior of ultrahigh carbon steels containing Si in hot rolling processes was investigated. The graphite stringers went mostly through the small pores and generally paralleled to the rolling direction. The influence of alloy elements on graphitization was estimated based on thermodynamics, which showed that Si content was important for graphitization. Graphite stringers nucleated at small pores and grew with carbon diffusion during hot rolling. Alloy contents, pores and hot deformation at γ+Fe3C phase range were the key factors for the formation of graphite. The probable effect of deformation on graphite formation during hot rolling was discussed in this paper.

Key words: Graphitization, Spray forming, Ultrahigh carbon steels, Hot rolling

Guangmin LUO, Jiansheng WU, Junfei FAN, Haisheng SHI, Yijian LIN, Jingguo ZHANG. Graphitization of Spray-formed Ultrahigh Carbon Steels Containing Si during Hot Rolling[J]. J Mater Sci Technol, 2005, 21(02): 161-164.

References

[1] O.D.Sherby, C.M.Young, B.Walser and E.M.Cady: United States Patent, 3951697, 1976.
[2] O.D.Sherby, T.Oyama and J.Wadsworth: United States Patent, 4448613, 1984.
[3] O.D.Sherby, T.Oyama, D.W.Kum, B.Walser and J.Wadsworth: J. Metals, 1985, 37(6), 50.
[4] M.J.Strum, A.Goldberg, O.D.Sherby and R.L.Landingham: United States Patent, 5445685, 1995.
[5] E.M.Taleff, M.Nagao, K.Higashi and O.D.Sherby. Scripta Mater., 1996, 34(12), 1919.
[6] E.M.Taleff, C.K.Syn, D.R.Lesuer and O.D.Sherby: Met- all. Mater. Trans. A, 1996, 27A(1), 111.
[7] C.K.Syn, D.R.Lesure and O.D.Sherby: Metall. Mater. Trans. A, 1994, 25A(7), 1481.
[8] B.D.Clarke and I.D.Mclvor: Ironmaking and Steelmaking, 1991, 18(5), 331.
[9] D.R.Lesure, C.K.Syn and O.D.Sherby: Acta Metall. Mater., 1995, 43(10), 3827.
[10] K.Han, D.V.Edmonds and G.D.W.Smith: Metall. Mater, Trans. A, 2001, 32(6), 1313.
[11] Jingguo ZHANG, Haisheng SHI and Jinsheng YAO: China Patent, 01126952.9, 2001.
[12] E.M.Teleff, B.L.Bramfitt, C.K.Syn, D.R.Lesuer, J.Wadsworth and O.D.Sherby: Mater. Char., 2001, 46, 11.
[13] W.D.Cai and E.J.Lavenia: Mater. Sci. Eng. A, 1997, A226-228, 8.
[14] A.Okamoto: Metall. IVans. A, 1989, 20A(10), 1917.
[15] Lin SHI: Alloy Thermodynamics, Mechanical Industry Press, Beijing, 1992, 318. (in Chinese)
[16] M.Hillert: Phase Equilibria, Phase Diagram and Phase Transformation: Tbeir Thermodynamic Basis, Cambridge University Press, 1998, 259.
[17] O.D.Sherby and T.Oyama: United States Patent, 4533390, 1985.
[18] J.D.Verhoeven and A.H.Pendray: Mater. Char., 1992, 29, 195.
[19] P.M.Berge, J.D.Verhoeven and D.T.Petersomn: Ironmak- ing and Steelmaking, 1995, 22(3), 67.
[20] K.Yoshihara and K.Nii: J. Jpn. Inst. Met., 1980, 44, 549.
[21] J.M.Song, B.C.Kuo, T.S.Liu and L.H.Chen: Metall. Mater. IVans. A, 2000, 31A, 275.
[22] S.Yamamoto, Y.Kawano, N.Hattori, Y.Murakami and R.Ozaki: Metal Sci., 1977, 11(12), 571.K