Microstructure evolution of high-manganese steel during the thermomechanical processing

• Autorzy: Dobrzański L. A. , Grajcar A. , Borek W.
• Języki publikacji: EN

Abstrakty

EN

Purpose: The aim of the paper is to determine the influence of hot-working conditions on microstructure evolution of new-developed high-manganese austenitic steel. Design/methodology/approach: The hot-working behaviour was determined in continuous and multi-stage compression tests performed in a temperature range of 850 to 1100°C by the use of the Gleeble 3800 thermomechanical simulator. The processes controlling work hardening and removing it were identified by microstructure evolution observations in successive stages of compression with the amount of true strain 4x0.29, 4x0.23 or 4x0.19. Findings: The investigated steel is characterized by high values of flow stresses from 250 to 450 MPa. Increase of flow stress along with decrease of compression temperature is accompanied by translation of εmax strain in the direction of higher deformation. Results of the multi-stage compression proved that applying the true strain 4x0.29 gives the possibility to refine the austenite microstructure as a result of dynamic recrystallization. In case of applying the lower deformations 4x0.23 and 4x0.19, the process controlling work hardening is dynamic recovery and a deciding influence on a gradual microstructure refinement has statical recrystallization. Research limitations/implications: To determine in detail the microstructure evolution during industrial rolling, the hot-working schedule should take into account real number of passes and higher strain rates. Practical implications: The obtained σ-ε curves can be useful in determination of power-force parameters of hot-rolling and to design a rolling schedule ensuring a fine-grained microstructure of high-manganese steel products. Originality/value: The microstructure evolution in various conditions of hot-working for the new-developed high-manganese Mn-Si-Al-Nb steel was determined.

Słowa kluczowe

EN

materials; metallic alloys; high-manganese steel; thermo-mechanical processing; compression test; dynamic recrystallization; static recrystallization

PL

materiały; stopy metaliczne; stal wysokomanganowa; obróbka termomechaniczna; próba ściskania; rekrystalizacja dynamiczna; rekrystalizacja statyczna

• Wydawca: International OCSCO World Press
• Czasopismo: Archives of Materials Science and Engineering
• Rocznik: 2009
• Tom: Vol. 37, nr 2
• Strony: 69--76
• Opis fizyczny: Bibliogr. 23 poz.

Twórcy

autor

Dobrzański L. A.

autor

Grajcar A.

autor

Borek W.

• Division of Materials Processing Technology, Management and Computer Techniques in Materials Science, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland,

Bibliografia

• [1] V. Flaxa, J. Shaw, Material applications in ULSAB-AVC, Steel Grips 1/4 (2003) 255-261.
• [2] M. Mehrkens, J. Fröber, Modern multi-phase steels in the BMW of the Porsche Cayenne, Steel Grips 1/4 (2003) 249-251.
• [3] B.C. De Cooman, Structure – properties relationship in TRIP steels containing carbide–free bainite, Current Opinion in Solid State & Materials Science 8 (2004) 285-303.
• [4] R. Kuziak, R. Kawalla, S. Waengler, Advanced high strength steels for automotive industry, Archives of Civil and Mechanical Engineering 8/2 (2008) 103-117.
• [5] X. Wei, R. Fu, L. Li, Tensile deformation behavior of cold–rolled TRIP–aided steels over large range of strain rates, Materials Science and Engineering A 465 (2007) 260–266.
• [6] Z. Gronostajski, S. Polak, Quasi-static and dynamic deformation of double-hat thin-walled elements of vehicle controlled body crushing zones joined by clinching, Archives of Civil and Mechanical Engineering 8/2 (2008) 57-65.
• [7] G. Frommeyer, O. Grässel, High strength TRIP/TWIP and superplastic steels: development, properties, application, La Revue de Metallurgie-CIT 10 (1998) 1299-1310.
• [8] G. Frommeyer, U. Brüx, P. Neumann, Supra-ductile and high-strength manganese-TRIP/TWIP steels for high energy absorption purposes,ISIJ International 43 (2003) 438-446.
• [9] O. Grässel, L. Krüger, G. Frommeyer, L.W. Meyer, High strength Fe-Mn-(Al, Si) TRIP/TWIP steels development - properties – application, International Journal of Plasticity 16 (2000) 1391-1409.
• [10] S. Allain, J.P. Chateau, O. Bouaziz, S. Migot, N. Guelton, Correlations between the calculated stacking fault energy and the plasticity mechanisms in Fe-Mn-C alloys, Materials Science and Engineering A 387-389 (2004) 158-162.
• [11] T. Bator, Z. Muskalski, S. Wiewiórkowska, 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.
• [12] S. Vercammen, B. Blanpain, B.C. De Cooman, P. Wollants, Mechanical behaviour of an austenitic Fe-30Mn-3Al-3Si and the importance of deformation twinning, Acta Materialia 52 (2004) 2005-2012.
• [13] G. Frommeyer, U. Brüx U., Microstructures and mechanical properties of high-strength Fe-Mn-Al-C light-weight TRIPLEX steels, Steel Research 9-10 (2006) 627-634.
• [14] K. Ishida, H. Ohtani, N. Satoh, R. Kainuma, T. Nishizawa, Phase equilibria in Fe-Mn-Al-C alloys, ISIJ International 30 (1990) 680-687.
• [15] A.S. Hamada, L.P. Karjalainen, M.C. Somani, The influence of aluminium on hot deformation behaviour and tensile properties of high-Mn TWIP steels, Materials Science and Engineering A 467 (2007) 114-124.
• [16] G. Niewielski, M. Hetmańczyk, D. Kuc, Influence of the initial structure and deformation conditions on properties of hot-deformed austenitic steels, Materials Engineering 24 (2003) 795-798 (in Polish).
• [17] L.A. Dobrzański, A. Grajcar, W. Borek, Influence of hot-working conditions on a structure of high-manganese austenitic steels, Journal of Achievements in Materials and Manufacturing Engineering 29/1 (2008) 139-142.
• [18] L.A. Dobrzański, A. Grajcar, W. Borek, Hot-working behaviour of high-manganese austenitic steels, Journal of Achievements in Materials and Manufacturing Engineering 31/1 (2008) 7-14.
• [19] L.A. Dobrzański, A. Grajcar, W. Borek, Microstructure evolution and phase composition of high-manganese austenitic steels, Journal of Achievements in Materials and Manufacturing Engineering 31/2 (2008) 218-225.
• [20] J. Adamczyk, Development of the microalloyed constructional steels, Journal of Achievements in Materials and Manufacturing Engineering 14 (2006) 9-20.
• [21] J. Adamczyk, A. Grajcar, Structure and mechanical properties of DP-type and TRIP-type sheets, Journal of Materials Processing Technology 162-163 (2005) 267-274.
• [22] A. Grajcar, Effect of hot-working on a retained austenite fraction in TRIP-aided steel, Journal of Achievements in Materials and Manufacturing Engineering 22/2 (2007) 79-82.
• [23] A. Grajcar, Structural and mechanical behaviour of TRIP steel in hot-working conditions, Journal of Achievements in Materials and Manufacturing Engineering 30/1 (2008) 27-34.