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Segregation of alloying elements in thermomechanically rolled medium-Mn multiphase steels

Wybrane pełne teksty z tego czasopisma
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Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Purpose: The aim of the paper is to assess the tendency of alloying elements to macro- and microsegregation during hot-forging and successive thermomechanical rolling of medium-Mn Al-bearing steel sheets. Design/methodology/approach: The macro- and microsegregation of alloying elements was assessed by EDS and WDS measurements across the thickness of the roughly-forged flats and thermomechanically processed 3.3 mm sheets. The microstructure was revealed using combined methods of optical microscopy (OM) and scanning electron microscopy (SEM). Morphological features of microstructural constituents were discussed with focusing on retained austenite. Findings: It was found that the final multiphase microstructure is mainly dependent on the Mn content and the effect of Nb microaddition is relatively low. The 3Mn steels possess very fine bainite-based microstructures whereas the steels containing 5% Mn are characterized by lath bainitic-martensitic microstructures. All the steels contain retained austenite as fine granules or layers located between bainitic ferrite laths. Some fraction of martensite-austenite (M-A) islands was also identified. The tendency of Mn and Al to macrosegregation was found after the initial hot-forging. It disappears after successive rough and thermomechanical rolling whereas thin martensite and martensite-austenite microbands as a result of Mn microsegregation locally occur. Research limitations/implications: Further investigations are required to quantify the local changes of chemical composition especially in formed microbands and X-ray quantitative phase analysis should be applied to assess a fraction of retained austenite. Practical implications: The knowledge of the macro- and microsegregation of alloying elements in advanced medium-Mn steels containing retained austenite can be useful in designing the thermomechanical rolling procedures of multiphase steel sheets. Originality/value: A problem of macro- and microsegregation of Mn and Al in advanced high strength steels, which belong to the third generation of automotive steels was discussed with concentrating on Mn and Nb microaddition effects.
Rocznik
Strony
256--264
Opis fizyczny
Bibliogr. 30 poz., rys., tab.
Twórcy
autor
  • Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland, adam.grajcar@polsl.pl
autor
  • Institute of Non-Ferrous Metals, ul. Sowińskiego 5, 44-100 Gliwice, Poland
autor
  • Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland
  • Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland
  • Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland
  • Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland
Bibliografia
  • [1] L. Samek, E. De Moor, J. Penning, B.C. De Cooman, Influence of alloying elements on the kinetics of strain-induced martensitic nucleation in low-alloy multiphase high-strength steels, Metallurgical and Materials Transactions A 37/1 (2006) 109-124.
  • [2] B. Gajda, A.K. Lis, A study of microstructure and phase transformations of CMnAlSi TRIP steel, Journal of Achievements in Materials and Manufacturing Engineering A 31/2 (2008) 646-653.
  • [3] W. Shi, L. Li, Ch. Yang, R.Y. Fu, L. Wang, P. Wollants, Strain-induced transformation of retained austenite in low-carbon low-silicon TRIP steel containing aluminum and vanadium, Materials Science and Engineering A 429/1-2 (2006) 247-251.
  • [4] A. Grajcar, H. Krztoń, Effect of isothermal bainitic transformation temperature on retained austenite fraction in C-Mn-Si-Al-Nb-Ti TRIP-type steel, Journal of Achievements in Materials and Manufacturing Engineering 35/2 (2009) 169-176.
  • [5] A.J. DeArdo, J.E. Garcia, M. Hua, C.I. Garcia, A new frontier in microalloying. Advanced high strength, coated sheet steels, Materials Science Forum 500-501 (2005) 27-38.
  • [6] A. Grajcar, Determination of the stability of retained austenite in TRIP-aided bainitic steel, Journal of Achievements in Materials and Manufacturing Engineering 20/1-2 (2007) 111-114.
  • [7] A. Pichler, S. Traint, T. Hebesberger, P. Stiaszny, E.A. Werner, Processing of thin multiphase steel grades. Steel Research International 78 (2007) 216-223.
  • [8] 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.
  • [9] 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.
  • [10] 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 22/1 (2007) 13-20.
  • [11] J. Lis, A.K. Lis, Austenite formation during intercritical annealing, Journal of Achievements in Materials and Manufacturing Engineering 29/1 (2008) 83-90.
  • [12] A. Grajcar, Effect of hot-working in the y+a range on a retained austenite fraction in TRIP-aided steel, Journal of Achievements in Materials and Manufacturing Engineering 22/2 (2007) 79-82.
  • [13] L.A. Dobrzański, W. Borek, M. Ondrula, Thermomechanical processing and microstructure evolution of high-manganese austenitic TRIP-type steels, Journal of Achievements in Materials and Manufacturing Engineering 53/2 (2012) 59-66.
  • [14] B. Wietbrock, M. Bambach, S. Seuren, G. Hirt, Homogenization strategy and material characterization of high-manganese TRIP and TWIP steels, Materials Science Forum 638-642 (2010) 3134-3139.
  • [15] A. Grajcar, M. Opiela, G. Fojt-Dymara, The influence of hot-working conditions on a structure of high-manganese steel, Archives of Civil and Mechanical Engineering 9/3 (2009) 49-58.
  • [16] 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.
  • [17] T. Bator, Z. Muskalski, S. Wiewiórowska, J.W. Pilarczyk, Influence of the heat treatment on the mechanical properties and structure of TWIP steel in wires, Archives of Materials Science and Engineering 28/6 (2007) 337-340.
  • [18] 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.
  • [19] A. Grajcar, E. Kalinowska-Ozgowicz, M. Opiela, B. Grzegorczyk, K. Gołombek, Effects of Mn and Nb on the macro- and microsegregation in high-Mn high-Al content TRIP steels, Archives of Materials Science and Engineering, 49/1 (2011) 5-14.
  • [20] S.J. Lee, S. Lee, B.C. De Cooman, Mn partitioning during intercritical annealing of ultrafine-grained 6% Mn transformation-induced plasticity steel, Scripta Materialia 64 (2011) 649-652.
  • [21] A. Grajcar, S. Lesz, Influence of Nb microaddition on a microstructure of low-alloyed steels with increased manganese content, Materials Science Forum 706-709 (2012) 2124-2129.
  • [22] 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.
  • [23] A. Grajcar, R. Kuziak, Effects of Nb microaddition and thermomechanical treatment conditions on hot deformation behavior and microstructure of Mn-Al TRIP steels, Advanced Science Letters 15 (2012) 332-336.
  • [24] S. Lee, S.J. Lee, S. Santhosh Kumar, K. Lee, B.C. De Cooman, Localized deformation in multiphase, ultra-finegrained 6 pct Mn transformation-induced plasticity steel, Metallurgical and Materials Transactions A 42 (2011) 3638-3651.
  • [25] A. Grajcar, W. Kwaśny, Microstructural study on retained austenite in advanced high-strength multiphase 3Mn-1.5Al and 5Mn-1.5Al steels, Journal of Achievements in Materials and Manufacturing Engineering 54/2 (2012) 168-177.
  • [26] A. Grajcar, R. Kuziak, W. Zalecki, Third generation of AHSS with increased fraction of retained austenite for the automotive industry, Archives of Civil and Mechanical Engineering 12 (2012) 334-341.
  • [27] A. Grajcar, Segregation behaviour of third generation advanced high-strength Mn-Al steels, Archives of Foundry Engineering 12/2 (2012) 123-128.
  • [28] J. Domitner, A. Kharicha, M. Grasser, A. Ludwig, Reconstruction of three-dimentional dendritic structures based on the investigation of microsegregation patterns, Steel Research International 81/8 (2010) 644-651.
  • [29] S. Zajac, V. Schwinn, K.H. Tacke, Characterisation and quantification of complex bainitic microstructures in high and ultra-high strength linepipe steels, Materials Science Forum 500-501 (2005) 387-394.
  • [30] F.G. Caballero, J. Chao, J. Cornide, C. Garcia-Mateo, M.J. Santofimia, C. Capdevila, Toughness deterioration in advanced high strength bainitic steels, Materials Science and Engineering A 525 (2009) 87-95.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-ee912879-22f8-4916-8d79-006e0984cbb2
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