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Purpose: The aim of the paper is to investigate the influence of plastic deformation and cooling conditions on a structure and a shape of CCT-diagrams of new-developed TRIP-aided microalloyed steels. Design/methodology/approach: The diagrams of undeformed and plastically-deformed supercooled austenite transformations for low-carbon and medium-carbon microalloyed steels were determined. A part of the specimens were austenitized at a temperature of 1100*C, then slowly cooled to 900*C and next cooled to ambient temperature with a various rate from 1 to 300*C/s. To investigate the influence of plastic deformation on a shape of CCT (Continuous Cooling Transformations) diagrams, another part of the specimens were 50% deformed at 900*C and cooled to ambient temperature with a rate from 88 to 1*C/s. The DIL805A/D dilatometer, with a LVDT-type measuring head, was used to carry out dilatometric tests. Findings: It was found that a shape of CCT diagrams of elaborated steels predisposes them for multiphase sheets manufacturing. The new-developed steels possess ferritic and bainitic bays put forward to short times and pearlitic regions put aside. However, cooling the steel with a constant rate from austenitizing temperature doesn't lead to obtaining proper participation of ferrite. Plastic deformation of steel has a profitable influence on the shape of supercooled austenite curves. The region of γ-α transformation is translated to the left at simultaneous raise of start temperature of austenite into ferrite transformation resulting in definitely higher ferrite fraction. Moreover, significant refinement of microstructure in a whole range of cooling rate was also obtained. Research limitations/implications: To increase the ferrite fraction, modification of the cooling after hot-working finishing should be applied. In the fist stage, steel should be rapidly cooled in order to enter the range of γ-α transformation and successively slowly cooled in a range of γ-α transformation. Practical implications: The obtained CCT diagrams of supercooled plastically-deformed austenite transformations can be useful in a determination of cooling in the thermo-mechanical processing for TRIP-type steel sheets. Originality/value: The diagrams of the plastically-deformed supercooled austenite for TRIP-type microalloyed steels were obtained.
Wydawca
Rocznik
Tom
Strony
71--78
Opis fizyczny
Bibliogr. 26 poz., il., wykr.
Twórcy
autor
autor
- Division of Constructional and Special Materials, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland, adam.grajcar@polsl.pl
Bibliografia
- [1] I. B. Timokhina, P. D. Hodgson, E. V. Pereloma, Effect of alloying elements on the microstructure-property relationship in thermomechanically processed C-Mn-Si TRIP steels, Steel Research 73 (2002) 274-286.
- [2] A. K. Lis, B. Gajda, Modelling of the DP and TRIP microstructure in the CMnAlSi automotive steel, Journal of Achievements in Materials and Manufacturing Engineering 15 (2006) 127-134.
- [3] J. Adamczyk, A. Grajcar, Structure and mechanical properties of DP-type and TRIP-type sheets obtained after the thermomechanical processing, Journal of Materials Processing Technology 162-163 (2005) 267-274.
- [4] A. Grajcar, Hot-working in the γ+α region of TRIP-aided microalloyed steel, Archives of Materials Science and Engineering 28/12 (2007) 743-750.
- [5] J. Adamczyk, Development of the microalloyed constructional steels, Journal of Achievements in Materials and Manufacturing Engineering 14 (2006) 9-20.
- [6] A. Grajcar, Effect of hot-working in the γ+α range on a retained austenite fraction in TRIP-aided steel, Journal of Achievements in Materials and Manufacturing Engineering 22 (2007) 79-82.
- [7] B. Gajda, A. K. Lis, Thermal processing of CMnAlSi steel at (α+γ) temperature range, Journal of Achievements in Materials and Manufacturing Engineering 18 (2006) 355-358.
- [8] S. Wen, L. Lin, B. De Cooman, P. Wollants, Y. Chun-Xia, Thermal stability of retained austenite in TRIP steel after different treatments, Journal of Iron and Steel Research 15 (2006) 61-64.
- [9] A. Grajcar, Determination of the stability of retained austenite in TRIP-aided bainitic steel, Journal of Achievements in Materials and Manufacturing Engineering 20 (2007) 111-114.
- [10] E. Doege, S. Kulp, Ch. Sunderkötter, Properties and application of TRIP-steel in sheet metal forming, Steel Research 73 (2002) 303-308.
- [11] B. C. De Cooman, Structure-properties relationship in TRIP-steels containing carbide-free bainite, Current Opinion in Solid State and Materials Science 8 (2004) 285-303.
- [12] L. Cretteur, A. Koruk, L. Tosal-Martinez, Improvement of weldability of TRIP steels by use of in-situ pre-and post-heat treatments, Steel Research 73 (2002) 314-319.
- [13] P. Jacques, Q. Furnemont, T. Pardoen, F. Delannay, On the role of martensitic transformation on damage and cracking resistance in TRIP-assisted multiphase steels, Acta Materialia 49 (2001) 139-152.
- [14] M. Opiela, Thermo-mechanical treatment of the C-Mn steel with Nb, Ti, V and B microadditions, Archives of Materials Science and Engineering 28/6 (2007) 377-380.
- [15] B. Ehrhardt, T. Berger, H. Hofmann, T. W. Schaumann, Property related design of advanced cold rolled steels with induced plasticity, Steel Grips 2 (2004) 247-255.
- [16] K. Sugimoto, T. Iida, J. Sakaguchi, T. Kashima, Retained austenite characteristics and tensile propereties in a TRIP type bainitic sheet steel, ISIJ International 9 (2000) 902-908.
- [17] J. Majta, R. Kuziak, M. Pietrzyk, Modelling of the influence of thermomechanical processing of Nb-microalloyed steel on the resulting mechanical properties, Journal of Materials Processing Technology 80-81 (1998) 524-530.
- [18] J. Adamczyk, M. Opiela, Influence of the thermo-mechanical treatment parameters on the inhomogenity of the austenite structure and mechanical properties of the Cr-Mo steel with Nb, Ti, and B microadditions, Journal of Materials Processing Technology 157-158 (2004) 456-461.
- [19] E. Hadasik, R. Kuziak, R. Kawalla, M. Adamczyk, M. Pietrzyk, Rheological model for simulation of hot rolling of new generation steel strip for automotive applications, Steel Research 77 (2006) 927-933.
- [20] R. Kawalla, G. Goldhahn, W. Jungnickel, Laboratory rolling condition and its effect on rolling parameters on material properties of hot rolled products, Proceedings of the 2nd International Conference on Thermomechanical Processing of Steel, TMP'2004, Liege (2004) 17-24.
- [21] T. Siwecki, Physical metallurgy and modeling of thermomechanically processed microalloyed steels, Materials Engineering 3 (1998) 163-170.
- [22] P. Uranga, B. Lopez, J-M. Rodriguez-Ibabe, Microstructural modelling of Nb microalloyed steel during thin slab direct rolling processing, Steel Research 78 (2007) 199-209.
- [23] B. Gajda, A. K. Lis, Intercritical annealing with isothermal holding of TRIP CMnAlSi steel, Journal of Achievements in Materials and Manufacturing Engineering 20 (2007) 439-442.
- [24] O. Muransky, P. Hornak, P. Lukas, J. Zrnik, P. Sittner, Investigation of retained austenite stability in Mn-Si TRIP steel in tensile deformation condition, Journal of Achievements in Materials and Manufacturing Engineering 14 (2006) 26-30.
- [25] 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.
- [26] A. Grajcar, M. Opiela, Diagrams of supercooled austenite transformations of low-carbon and medium-carbon TRIP-steels, Journal of Achievements in Materials and Manufacturing Engineering (in press).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BWAN-0003-0059