Effect of strain rate on hot ductility of C-Mn-B steel

• Autorzy: Lis A. , Lis J. , Kolan C. , Knapiński M.
• Języki publikacji: EN

Abstrakty

EN

Purpose: The aim of the paper is to determine the influence of hot deformation conditions on hot ductility and ó-ĺ curves of C-Mn-B steel. Design/methodology/approach: The force – energetic parameters of hot – working were determined in hot tensile tests performed in a temperature range of 700 to 1200°C by the use of Gleeble 3800 thermo – mechanical simulator with strain rate 0.01 s-1 and 6.5 s-1 After rupture the contractions of samples were measured. Samples were taken from columnar and equiaxed grains zone of continuously cast billet. Findings: Hot ductility curves as a measure of contraction in function of temperature of deformation for given strain rate and shape of the grains were established. At strain rate 6.5 s-1 there was no minimum of hot ductility for columnar grains and for equiaxed grains minimum of hot ductility was temperature 800 – 850°C (40%). At strain rate 0.01 s-1 and equiaxed grains minimum of the hot ductility (23%) was between 800 – 900°C and for columnar grains between 850-950°C at about 40%. Minimum of the hot ductility was usually in the vicinity of Ar3 temperature. Research limitations/implications: To determine in detail the hot ductility behaviour of C-Mn-B steel, a SEM investigations of rupture should be done. Practical implications: The obtained stress-strain curves can be useful in determination of power-force parameters of hot-rolling. Originality/value: The hot ductility behaviour of new-developed low carbon steel containing Boron microaddition was investigated.

Słowa kluczowe

EN

low carbon C-Mn-B steel; hot working; hot ductility; flow curve; rheological equation

PL

stal niskowęglowa C-Mn-B; obróbka na gorąco; ciągliwość; krzywa płynięcia; równanie reologiczne

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2010
• Tom: Vol. 41, nr 1-2
• Strony: 26--33
• Opis fizyczny: Bibliogr. 15 poz., rys., tabl.

Twórcy

autor

Lis A.

autor

Lis J.

autor

Kolan C.

autor

Knapiński M.

• Institute of Materials Engineering, Czestochowa University of Technology, Al. Armii Krajowej 19, 42-200 Częstochowa, Poland,

Bibliografia

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• [3] A. Nowotnik, J. Sieniawski, K. Kubiak, Effect of deformation conditions and microstructure on flow stress of low carbon 0.15%C steel, Materials Engineering 3 (2006) 237 (in Polish).
• [4] A. Lis, J. Lis, N. Wolańska, M. Knapiński, H. Dyja, C. Kolan, P. Wieczorek, Hot ductility of steel with and without boron for conditions of continuous casting of steel and rolling process, Report for investigation project Nr 3 T 08B 019 30, Czestochowa University of Technology, Institute of Materials Engineering, 2008 (in Polish).
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• [6] A. Lis, C. Kolan, P. Wieczorek, J. Lis, Influence of boron segregation on phase transformation kinetics of low carbon steel, Metallurgist - Metallurgical News (2009) 507 (in Polish).
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• [10] N. Wolańska, A. Lis, J. Lis, Microstructure Investigation of Low Carbon Steel After Hot Deformation, Journal of Achievements in Materials and Manufacturing Engineering 20 (2007) 291-294.
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• [12] J. Lis, A. Lis, Austenite Formation During Intercritical Annealing, Journal of Achievements in Materials and Manufacturing Engineering 29/1 (2008) 83-90.
• [13] J. Lis, A. Lis, Kinetics of the Austenite Formation During Intercritical Annealing, Journal of Achievements in Materials and Manufacturing Engineering 26/2 (2008) 195-198.
• [14] N. Wolańska, Hot ductility of low carbon steel, Ph.D Thesis, 2008.
• [15] C. Kolan, A.K. Lis, J. Lis, N. Wolańska, Quantitative description of ferrite grains in C10B6 steel after thermomechanical treatment from (α+γ) range, Materials Engineering 4 (2008) 271-274.