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Diagrams of supercooled austenite transformations of low-carbon and medium-carbon TRIP-steels

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Języki publikacji
EN
Abstrakty
EN
Purpose: The aim of the paper is to determine the influence of cooling conditions on a structure and a shape of CCT-diagrams of TRIP-aided steels. Design/methodology/approach: The diagrams of undeformed supercooled austenite transformations for low-carbon and medium-carbon steels were determined. The specimens were austenitized at a temperature of 1100°C and cooled from a temperature of 900°C with a rate in a range from 1 to 300°Cs-1. The dilatometric tests were carried out by the use of the DIL805A/D dilatometer with a LVDT-type measuring head. Findings: It was found that obtained CCT-diagrams of low-carbon and medium-carbon steels are favourable for manufacturing TRIP-type steels with multiphase structures. The steels are characterized by large ferritic and bainitic fields and a right-displaced pearlitic range. However, a ferrite fraction obtained after cooling with an optimum rate from a temperature of 900°C is low. Increasing the fraction of the α phase requires two-stage cooling after austenitizing. Research limitations/implications: To obtain the optimum ferrite fraction, it is necessary to modify a cooling course in a range of γ→α transformation. It should result in an effective utilization of the time for the transformation of austenite into the fine-grained ferrite. Practical implications: The obtained diagrams of supercooled austenite transformations can be useful in a determination of a cooling course from a finishing rolling temperature for sheets with a multiphase structure. Originality/value: The diagrams of the undeformed supercooled austenite for the low-carbon and medium-carbon steels containing Nb and Ti microadditions were obtained.
Rocznik
Strony
13--16
Opis fizyczny
Bibliogr. 16 poz.
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, 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 22/2 (2007) 79-82.
  • [5] 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.
  • [6] 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.
  • [7] 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.
  • [8] 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.
  • [9] M. Opiela, Thermo-mechanical treatment of the C-Mn steel with Nb, Ti, V and B microadditions, Archives of Materials Science and Engineering 28 (2007) 377-380.
  • [10] 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.
  • [11] 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 "Thermomechanical Processing of Steel" TMP'2004, Liege, 2004, 17-24.
  • [12] T. Siwecki, Physical metallurgy and modeling of thermomechanically processed microalloyed steels, Materials Engineering 3 (1998) 163-170.
  • [13] 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.
  • [14] 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.
  • [15] 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.
  • [16] 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
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BSL8-0028-0029
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