Hot Deformation Behavior of a 3^rd Generation Advanced High Strength Steel with a Medium-Mn Content

Abstract:

Medium-Mn steels are one of the promising candidates to achieve the desired mechanical properties in the 3^rd generation of cold rolled advanced high strength steels (AHSS) for automotive applications. Their duplex microstructure consists of a ferritic matrix with a substantial amount of metastable retained austenite, which transforms to strain-induced martensite upon forming. This strengthening mechanism, well known as the TRansformation Induced Plasticity (TRIP) effect, provides the steel an excellent combination of high strength and elongation with a product of R_mxA₈₀ up to 30.000 MPa%. As hot rolling is one of the crucial steps during their production, the hot deformation behavior of Medium-Mn steels has to be thoroughly evaluated during their development stage.Therefore, the present contribution studied the hot deformation response of a 0.1 %C 5.5 %Mn steel by means of hot compression tests using a Gleeble^® 3800 device. The influence of different deformation temperatures (900-1100 °C) and strain rates (0.1-10 s^-1) on the stress-strain behavior was investigated. The flow curves were analyzed and corrected by the effects of adiabatic heating.Furthermore, the strain rate sensitivity m of the material was determined by evaluating stress values at different strain rates for given temperatures and strains. The m-values can be used to predict the deformation behavior of the material within the investigated range of parameters.Lastly, the hot working behavior of an alternative steel concept for a 3^rd Generation AHSS with significantly lower Mn-content was comparatively investigated.

• Periodical: Key Engineering Materials (Volumes 651-653)
• Pages: 120-125
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.651-653.120
• Online since: July 2015
• Authors: Katharina Steineder*, Martina Dikovits, Coline Beal, Christof Sommitsch, Daniel Krizan, Reinhold Schneider
• Keywords: 3^rd Generation AHSS, Hot Compression, Strain Rate Sensitivity

References

[1] D. K. Matlock, J. G. Speer, E. De Moor, P. J. Gibbs, Jestech 15 (2012) 1, pp.1-12.

[2] H. J. Jun, O. Yakubovsky , N. Fonstein, Proc. 1st Int. Conf. High Manganese Steels, 2011, Seoul, Korea, 15. -18. 05. (2011).

[3] C. Poletti, M. Dikovits, J. Ruete, Key Eng. Mater. 554-557 (2013), pp.1224-1231.

DOI: 10.4028/www.scientific.net/kem.554-557.1224

[4] K. Hausmann, D. Krizan, A. Pichler, E. Werner, Mater. Sci. and Techn. (MS&T), 2013, Montreal, Canada, 27. -31. 10. (2013).

[5] J. Castellanos, I. Rieiro, M. Carsí, J. Munoz, M. El Mehtedi, O.A. Ruano, Mater. Sci. Eng. A 517 (2009), p.191–196.

[6] J. Zhang, H. Di, X. Wang, Y. Cao, J. Zhang, T. Ma, Mater. Des. 44 (2013), p.354–364.

[7] DSI Application Note, APN002, New York, (2001).

[8] B. Wang, X. Xu, X. Liu, G. Wang, J. Iron. Steel Res. Int. 13 (2006), pp.49-53.

[9] E. E. Underwood, Quant. Met., in J.R. Davis (Eds. ), ASM Handbook, Vol. 9, ASM Int., (1985).

[10] S. Hofer, M. Hartl, G. Schestak, R. Schneider, BHM 156 (2011), pp.99-104.

[11] B. Wietbrock, W. Xiong, M. Bambach, G. Hirt, Steel. Res. Int. 82 (2011), pp.63-69.

[12] L. Zhu, D. Wu, X. Zhao, J. Iron. Steel Res. Int. 14 (2007), pp.61-65.

[13] E.I. Poliak, F. Siciliano, Mater. Sci. and Techn. (MS&T), 2004, New Orleans, USA, 26. -29. 09. (2004).

[14] N. Cabañas, N. Akdut, J. Penning, B.C. DeCooman, Metall. Mater. Trans. A37 (2006), pp.3305-3315.