Combined effects of strain and cooling path on hot deformation response and microstructure of low-carbon structural steel

• Autorzy: Morawiec M. , Borek W. , Mroziński M. , Grajcar A.

Identyfikatory

DOI

10.5604/01.3001.0013.1421

• Języki publikacji: EN

Abstrakty

EN

Purpose: The aim of the paper is to analyse the effect of thermomechanical process with different cooling paths on microstructure and mechanical properties of low-carbon structural steel. Design/methodology/approach: The steel used for the investigation was subjected to two step deformation using a Gleeble 3800 simulator and then held at designed temperatures from 650ºC to 800ºC for different times. A final step included water cooling to room temperature to freeze the microstructure. Typical microscopic studies have been done. The analysis of the volume fraction of presented phases was carried out together with the measurement of grain size by means of image analysis. The last part of conducted research was hardness analysis of the steel after the different heat treatments. Findings: It was found that the microstructure constitution and grain size are strongly dependent on the temperature of isothermal holdings. The microstructure of steel held at 800ºC is composed of the mixture of bainite and two kinds of ferrite: globular and acicular. When the temperature was lowered by 50ºC the ferrite shows the globular morphology. When the temperature drops to 700ºC and below it, the microstructure is composed of ferritic-pearlitic mixture. It was observed that when the isothermal temperature was increased the grain size decreased and the opposite effect was observed for the holding time. The longer the time of the isothermal holding, the larger was the grain size. Research limitations/implications: For better understanding of the phase transformation kinetics in this steel the dilatometric test are planned. Practical implications: The knowledge of the microstructure evolution and hot deformation response of low-carbon structural steels is important from the industrial point of view. Originality/value: The combined effects of hot deformation and different cooling paths give the useful information on a microstructure evolution.

Słowa kluczowe

EN

structural steel; low-carbon steel; hot deformation; thermomechanical process; gleeble simulator; cooling path

PL

stal konstrukcyjna; stal niskowęglowa; odkształcenie na gorąco; proces termomechaniczny; symulator Gleeble; droga ochładzania

• Wydawca: International OCSCO World Press
• Czasopismo: Archives of Materials Science and Engineering
• Rocznik: 2019
• Tom: Vol. 95, nr 1
• Strony: 5--11
• Opis fizyczny: Bibliogr. 15 poz.

Twórcy

autor

Morawiec M.

• Institute of Engineering Materials and Biomaterials, Faculty of Mechanical Engineering, Silesian University of Technology ul. Konarskiego 18A, 44-100 Gliwice, Poland

autor

Borek W.

• Institute of Engineering Materials and Biomaterials, Faculty of Mechanical Engineering, Silesian University of Technology ul. Konarskiego 18A, 44-100 Gliwice, Poland

autor

Mroziński M.

• Institute of Engineering Materials and Biomaterials, Faculty of Mechanical Engineering, Silesian University of Technology ul. Konarskiego 18A, 44-100 Gliwice, Poland

autor

Grajcar A.

• Institute of Engineering Materials and Biomaterials, Faculty of Mechanical Engineering, Silesian University of Technology ul. Konarskiego 18A, 44-100 Gliwice, Poland

Bibliografia

• [1] K. Miernik, R. Bogucki, S. Pytel, Effect of quenching techniques on the mechanical properties of low carbon structural steel, Archives of Foundry Engineering 10 (2010) 91-96.
• [2] P. Bala, Tempcore process analysis based on the kinetics of phase transformations, Archives of Metallurgy and Materials 54/4 (2009) 1223-1230.
• [3] A. Grajcar, Structural and mechanical behaviour of TRIP-type microalloyed steel in hot-working conditions, Journal of Achievements in Materials and Manufacturing Engineering 30/1 (2008) 27-34.
• [4] M. Opiela, A. Grajcar, Elaboration of forging conditions on the basis of the precipitation analysis of MX-type phases in microalloyed steels, Archives of Civil and Mechanical Engineering 12/4 (2012) 427-435.
• [5] 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.
• [6] M. Opiela, Thermodynamic analysis of the precipitation of carbonitrides in microalloyed steels, Materiali in Tehnologije 49 (2015) 395-401.
• [7] T. Sourmail, C. Garcia-Mateo, F.G. Caballero, S. Cazottes, T. Epicier, F. Danoix, D. Milboum, The Influence of vanadium on ferrite and bainite formation in a medium carbon steel, Metallurgical and Materials Transactions A 48 (2017) 3985¬3996.
• [8] M. Opiela, Thermomechanical treatment of Ti-Nb-V-B micro-alloyed steel forgings, Materiali in Tehnologije 48 (2014) 587-591.
• [9] L.A. Dobrzański, W. Borek, M. Czaja, J. Mazurkiewicz, Structure of XllMnSiA117-l-3 steel after hotrolling and Gleeble simulations, Archives of Materials Science and Engineering 61 (2013) 13-21.
• [10] 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.
• [11] M. Jabłońska, A. Smiglewicz, A study of mechanical properties of high manganese steels after different rolling conditions, Metalurgija 54/4 (2015) 619-622.
• [12] A. Hamada, A. Khosravifard, D. Porter, P. Karjalainen, Physically based modeling and characterization of hot deformation behavior of twinning-induced plasticity steels bearing vanadium and niobium, Materials Science and Engineering A 703 (2017) 85-96.
• [13] J. Krawczyk, J. Pacyna, P. Bała, Fracture toughness of steels with nickel content in respect of carbide morphology, Materials Science and Technology 31 (2015) 795-801.
• [14] P.O. Offor, C.C. Daniel, B.A. Okorie, The effect of intercritical heat treatment on the mechanical properties of 0.14wt%C-0.56wt%Mn-0.13wt%Si structural steel, Nigerian Journal of Technology 30 (2011)29-34.
• [15] K.W. Andrews, Empirical formula for the calculation of some transformation temperatures, Journal of Steel and Iron Institute 203/7 (1965) 721-727.

Uwagi

PL

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).