Comparision of Direct Quenching and Reheat Quenching Process on Microstructure and Mechanical Properties of a High Strength Steel

Abstract:

The effects of direct quenching and tempering (DQ-T) process and conventional reheat quenching and tempering (RQ-T) processes on the microstructure and mechanical properties of a high strength low alloy steel were investigated. In the as-quenched DQ steel, prior austenite grains are elongated parallel to the rolling direction, whereas the as-quenched RQ steel mainly consists of equiaxed grains; The DQ process was found to enhance the hardenability of steel effectively. The tensile strength and yield strength of DQ specimen, were higher than that of RQ specimen. In contrast, low temperature toughness of DQ-T specimen was generally inferior to that of RQ-T specimen.

• Periodical: Advanced Materials Research (Volumes 287-290)
• Pages: 805-809
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.287-290.805
• Online since: July 2011
• Authors: Zheng Tao Duan, Yan Mei Li, Fu Xian Zhu
• Keywords: Direct Quenching, Mechanical Property, Microstructure, Reheat Quenching

References

[1] Y. Iwasaki, K. Kobayashi, K. Ueno, et al: Transactions ISIJ, Vol. 25 (1985), pp.1059-1068.

[2] K.A. Taylor, S.S. Hansen: Metall. Mater. Trans. A, Vol. 22A (1991), pp.2359-2374.

[3] C. Ouchi: ISIJ Int., Vol. 41(6) (2001), pp.542-553.

[4] K.A. Taylor, S.S. Hansen: Metall. Mater. Trans. A, Vol. 21A(6) (1990), pp.1697-1708.

[5] G.C. Hwang, S. Lee, J.Y. Yoo, W.Y. Choo: Material Science and Engineering, Vol. 252A (1998), pp.256-268.

[6] G.Z. Xiao, H.S. Di, F.X. Zhu: JMEPEG, Vol. 19(2010), p: 868-872

[7] K.A. Taylor: Iron Steel Maker, Vol. 2 (1993) 43-51.

[8] M.F. Mekkawy, K.A. Fawakhry, M.L: Iron Steel Maker, Vol. 10 (1990), pp.75-88.

[9] W.S. Chang: Mater. Sci., Vol. 37 (2002), p: 1973-1979.

[10] J. Qiu, X. Jua, Y. Xin: Journal of Nuclear Materials, Vol. 407 (2010), pp.189-194.