Abstract
Effects of finishing rolling temperatures and reduction on the mechanical properties of hot rolled multiphase steel were investigated. Thermo-mechanical control processing (TMCP) was conducted by using a laboratory hot rolling mill, in which three different kinds of finishing rolling temperatures and reduction and various austempering times were applied. The results showed that polygonal ferrite, granular bainite and larger amount of stabilized retained austenite can be obtained by controlled rolling processes, and that the strain-induced transformation to martensite from the retained austenite can occur gradually when the steel is deformed during tensile test. Mechanical properties increase with decreasing finishing rolling temperature and increasing amount of deformation. The most TRIP (transformation induced plasticity) effect, and ultimate tensile strength (UTS), total elongation (TEL) and the product of ultimate tensile strength and total elongation (UTS / TEL) are obtained at 20 min.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Bouquerel, J., Verbeken, K., Decooman, B.C., 2006. Microstructure-based model for the static mechanical behaviour of multiphase steels. Acta Materialia, 54(6): 1443–1456. [doi:10.1016/j.actamat.2005.10.059]
Girault, E., Jacques, P., Harlet, P., Mols, K., Vanhumbeeck, J., Aernoudt, E., Delannay, F., 1998. Metallographic methods for revealing the multiphase microstructure of TRIP-assisted steels. Mater. Characterization, 40(2):111–118. [doi:10.1016/S1044-5803(97)00154-X]
Godet, S., Harlet, P., Jacques, P.J., 2006. Grain refinement of TRIP-assisted multiphase steels through strain-induced phase transformation. Steel Research International, 77(4):271–275.
Goel, N.C., Chakravarty, J.P., Tangri, K., 1987. The influence of starting microstructure on the retention and mechanical stability of austenite in an intercritically annealed-low alloy dual-phase steel. Metall. Trans., 18A(1):5–9.
Hanzaki, A.Z., Hodgson, P.D., Yue, S., 1995. The influence of bainite on retained austenite characteristics in Si-Mn TRIP steels. The Iron and Steel Institute of Japan, International, 35(1):79–85.
Laasraoui, A., Jonas, J.J., 1991. Recrystallization of austenite after deformation at high temperatures and strain rates-analysis and modelling. Metall. Trans., 22A(1):151–160.
Meyer, M.D., Vanderschueren, D., Decooman, B.C., 1999. The influence of the substitution of Si by Al on the properties of cold rolled C-Mn-Si TRIP steels. The Iron and Steel Institute of Japan, International, 39(8):813–822.
Mihaly, R., Balazs, V., Zsolt, C., Jiansheng, P., 2004. Modeling of intercritical heat treatment of DP and TRIP steels. Transactions of Materials and Heat Treatment, 25(5):710–715.
Pereloma, E.V., Timokhina, I.B., Hodgson, P.D., 1999. Transformation behaviour in thermomechanically processed C-Mn-Si TRIP steels with and without Nb. Mater. Sci. Eng., 273(12):448–452.
Ryu, H.B., Speer, J.G., 2002. Effect of thermomechanical processing on the retained austenite content in a Si-Mn transformation-induced-plasticity. Metall. Trans., 33A(9):2811–2816.
Sakuma, Y., Matsumura, O., Takechi, H., 1991. Mechanical properties and retained austenite in intercritically heat-treated bainite-transformed steel and their variation with Si and Mn additions. Metall. Trans., 22A(2):489–498.
Samek, L., Demoor, E., Penninq, J., Decooman, B.C., 2006. Influence of alloying elements on the kinetics of strain-induced martensitic nucleation in low-alloy, multiphase high-strength steels. Metall. Trans., 37A(1):109–124.
Srivastava, A.K., Jha, G., Gope, N., Sinqh, S.B., 2006. Effect of heat treatment on microstructure and mechanical properties of cold rolled C-Mn-Si TRIP-aided steel. Materials Characterization, 57(2):127–135. [doi:10.1016/j.matchar.2006.01.010]
Sugimoto, K.I., Kobayashi, M., Hashimoto, S.I., 1992. Ductility and strain-induced transformation in a high-strength transformation-induced plasticity-aided dual-phase steel. Metall. Trans., 23A(11):3085–3091.
Sugimoto, K.I., Misu, M., Kobayashi, M., 1993. Effects of second phase morphology on retained austenite morphology and tensile properties in a TRIP-aided dual-phase steel sheet. The Iron and Steel Institute of Japan, International, 33(7):775–782.
Timokhina, I.B., Hodgson, P.D., 2003. Effect of deformation schedule on the microstructure and mechanical properties of a thermomechanically processed C-Mn-Si transformation-induced plasticity steel. Metall. Trans., 34A(8):1599–1609.
Timokhina, I.B., Hodgson, P.D., Pereloma, E.V., 2004. Effect of microstructure on the stability of retained austenite in transformation-induced-plasticity steels. Metall. Trans., 35A(8):2311–2341.
Valentin, N., Robert, G., Robert, R., 2004. Magnetic flux controllers for induction heating applications. Transactions of Materials and Heat Treatment, 25(5):567–572.
Yue, S., Dichiro, A., Hanzaki, A.Z., 1997. Thermomechanical processing effects on C-Mn-Si TRIP steels. Journal of Metals, 49(9):59–61.
Author information
Authors and Affiliations
Additional information
Project (No. 50334010) supported by the National Natural Science Foundation of China
Rights and permissions
About this article
Cite this article
Li, Z., Wu, D. Effects of finishing rolling temperatures and reduction on the mechanical properties of hot rolled multiphase steel. J. Zhejiang Univ. - Sci. A 8, 797–804 (2007). https://doi.org/10.1631/jzus.2007.A0797
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1631/jzus.2007.A0797