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Abstrakty
Third generation of advanced high-strength steels for the automotive industry contains a high volume fraction of fine-grained ferrite, carbide-free bainite, martensite and retained austenite. The level of strength and ductility is highly dependent on the fraction and mechanical stability of austenitic phase. One of the methods to obtain an increased fraction of γ phase is trough its chemical stabilization by Mn. Two 0.17C–3Mn–1.5Al–0.2Si–0.2Mo steels with and without Nb microaddition were developed in the present study. The steels were subjected to the thermomechanical processing designed on the basis of the DCCT diagram (deformation – continuous cooling transformation). The paper presents the results of the multi-stage compression tests and multiphase microstructures obtained as a result of the controlled multi-stage cooling. It was found that the hot workability of a new generation of AHSS is very challenging due to high values of flow stresses required. However, the thermomechanical processing enables to obtain very fine-grained bainite-based microstructures with a fraction of retained austenite up to 20%. The highest fraction of fine grains and interlath austenite was obtained for the temperature range between 400 and 450 °C. The effect of Nb results in higher flow stresses and better distribution of all the microstructural constituents.
Czasopismo
Rocznik
Tom
Strony
334--341
Opis fizyczny
Bibliogr. 28 poz., rys., tab., wykr.
Twórcy
autor
- Silesian University of Technology, Mechanical Engineering Faculty, Konarskiego Street 18a, 44-100 Gliwice, Poland
autor
- Institute for Ferrous Metallurgy, 12-14 Karola Miarki Street, 44-100 Gliwice, Poland
autor
- Institute for Ferrous Metallurgy, 12-14 Karola Miarki Street, 44-100 Gliwice, Poland
Bibliografia
- [1] J. Adamczyk, A. Grajcar, Heat treatment and mechanical properties of low-carbon steel with dual-phase microstructure, Journal of Achievements in Materials and Manufacturing Engineering 22 (2007) 13–20.
- [2] R. Kuziak, R. Kawalla, S. Waengler, Advanced high strength steels for automotive industry, Archives of Civil and Mechanical Engineering 8 (2) (2008) 103–117.
- [3] D. Krizan, B.C. De Cooman, Analysis of the strain-induced martensitic transformation of retained austenite in cold rolled micro-alloyed TRIP steel, Steel Research International 79 (7) (2008) 513–522.
- [4] M. Suliga, Z. Muskalski, The influence of single draft on TRIP effect and mechanical properties of 0.09C-1.57Mn-0.9Si steel wires, Archives of Metallurgy and Materials 54 (3) (2009) 677–684.
- [5] E. Hadasik, R. Kuziak, R. Kawalla, M. Adamczyk, M. Pietrzyk, Rheological model for simulation of hot rolling of new generation steel strips for automotive applications, Steel Research International 77 (12) (2006) 927–933.
- [6] D. Siodłak, U. Lotter, R. Kawalla, V. Schwich, Modelling of the mechanical properties of low alloyed multiphase steels with retained austenite taking into account strain-induced transformation, Steel Research International 79 (2008) 776–783.
- [7] A. Grajcar, W. Borek, The thermo-mechanical processing of high-manganese austenitic TWIP-type steels, Archives of Civil and Mechanical Engineering 8 (4) (2008) 29–38.
- [8] L.A. Dobrzański, A. Grajcar, W. Borek, Microstructure evolution of high-manganese steel during the thermomechanical processing, Archives of Materials Science and Engineering 37 (2) (2009) 69–76.
- [9] L.A. Dobrzański, W. Borek, Hot deformation and recrystallization of advanced high-manganese austenitic TWIP steels, Journal of Achievements in Materials and Manufacturing Engineering 46 (1) (2011) 71–78.
- [10] M. Opiela, A. Grajcar, W. Krukiewicz, Corrosion behaviour of Fe–Mn–Si–Al austenitic steel in chloride solution, Journal of Achievements in Materials and Manufacturing Engineering 33 (2) (2009) 159–165
- [11] A. Grajcar, U. Galisz, L. Bulkowski, Non-metallic inclusions in high-Mn austenitic alloys, Archives of Materials Science and Engineering 50 (1) (2011) 21–30.
- [12] Z. Gronostajski, A. Niechajowicz, S. Polak, Prospects for the use of new-generation steels of the AHSS type for collision energy absorbing components, Archives of Metallurgy and Materials 55 (1) (2010) 221–230.
- [13] E. De Moor, P.J. Gibbs, J.G. Speer, D.K. Matlock, Strategies for third-generation advanced high-strength steel development, Iron and Steel Technology 7 (11) (2010) 133–144.
- [14] S.J. Kim, Effects of manganese content and heat treatment condition on mechanical properties and microstructure of fine-grained low-carbon TRIP-aided steels, Materials Science Forum 638–642 (2010) 3313–3318.
- [15] M.J. Merwin, Microstructure and properties of cold rolled and annealed low-carbon manganese TRIP steels, Iron and Steel Technology 5 (10) (2008) 66–84.
- [16] K. Sugimoto, T. Iida, J. Sakaguchi, T. Kashima, Retained austenite characteristics and tensile properties in a TRIP type bainitic sheet steel, ISIJ International 40 (9) (2000) 902–908.
- [17] I. Tsukatani, S. Hashimoto, T. Inoue, Effects of silicon and manganese addition on mechanical properties of high-strength hot-rolled sheet steel containing retained austenite, ISIJ International 31 (9) (1991) 992–1000.
- [18] S. Hashimoto, S. Ikeda, K. Sugimoto, S. Miyake, Effects of Nb and Mo addition to 0.2%C–1.5%Si–1.5%Mn steel on mechanical properties of hot rolled TRIP-aided steel sheets, ISIJ International 44 (9) (2004) 1590–1598.
- [19] A. Grajcar, R. Kuziak, Dynamic recrystallization behavior and softening kinetics in 3Mn-1.5Al TRIP steels, Advanced Materials Research 287–290 (2011) 330–333.
- [20] A. Grajcar, R. Kuziak, Softening kinetics in Nb-microalloyed TRIP steels with increased Mn content, Advanced Materials Research 314–316 (2011) 119–122.
- [21] A. Grajcar, M. Opiela, Diagrams of supercooled austenite transformations of low-carbon and medium-carbon TRIP-steels, Archives of Materials Science and Engineering 32 (2008) 13–16.
- [22] M. Zhang, L. Li, R.Y. Fu, D. Krizan, B.C. De Cooman, Continuous cooling transformation diagrams and properties of micro-alloyed TRIP steels, Materials Science and Engineering A 438–440 (2006) 296–299.
- [23] A. Grajcar, M. Opiela, Influence of plastic deformation on CCT-diagrams of low-carbon and medium-carbon TRIP steels, Journal of Achievements in Materials and Manufacturing Engineering 29 (2008) 71–78.
- [24] A. Grajcar, R. Kuziak, W. Zalecki, Designing of cooling conditions for Si–Al microalloyed TRIP steel on the basis of DCCT diagrams, Journal of Achievements in Materials and Manufacturing Engineering 45 (2) (2011) 115–124.
- [25] A. Grajcar, Structural and mechanical behaviour of TRIP steel in hot-working conditions, Journal of Achievements in Materials and Manufacturing Engineering 30 (2008) 27–34.
- [26] R.M. Skolly, E.I. Poliak, Aspects of production hot rolling of Nb microalloyed high Al high strength steels, Materials Science Forum 500–501 (2005) 187–194.
- [27] F. Siciliano, E.I. Poliak, Modeling of the resistance to hot deformation and the effects of microalloying in high-Al steels under industrial conditions, Materials Science Forum 500–501 (2005) 195–202.
- [28] S. Zajac, V. Schwinn, K.H. Tacke, Characterization and quantification of complex bainitic microstructures in high and ultra-high strength linepipe steels, Materials Science Forum 500–501 (2005) 387–394.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-2aa60991-8521-4765-8714-ead304ecd434