The influence of microstructure on the mechanical properties of metallurgical rolls made of G200CrMoNi4-3-3 cast steel

• Autorzy: Brodziak A. , Stradomski Z. , Pirek A.
• Języki publikacji: EN

Abstrakty

EN

The subject of the study is the high-carbon tool cast steel G200CrMoNi4-3-3 used for metallurgical rolls, especially in section rolling mills. The test material was derived from a roll damaged in production; therefore, the authors had the material in a raw state at their disposal, on which they were able to carry out additional heat treatment operations. The pearlitic matrix of casting steel G200CrMoNi4-3-3 allows machining to be done to modify the pass or to remove any defects, and the primary and secondary precipitates of carbides enhance the tribological properties. The authors have been for years involved in the optimization of the structure of this material by slight correction to its chemical composition and/or the modification of heat treatment. The presented principles of heat treatment modifications will lead to considerable economic and ecologic profits. It has also been demonstrated that raising slightly the contents of carbide-forming elements, which markedly increases the quantity of transformed ledeburite, results in an enhancement of tribological properties. The analysis of a dozen or so rolls exploited down to the dead roll diameter has shown that roll of cast steel with increased contents of carbon and carbide-forming elements exhibit better service properties, as characterized by the amount of feedstock rolled. Such a method of enhancing the service properties required the assessment of fracture toughness, which was verified using the linear-elastic methods of fracture mechanics.

Słowa kluczowe

EN

heat treatment; hypereutectoid cast steel; tribology; ledeburite; stress intensity factors

PL

obróbka cieplna; staliwo nadeutektoidalne; tribologia; ledeburyt; współczynnik intensywności naprężeń

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2009
• Tom: Vol. 9, iss. 3
• Strony: 21--24
• Opis fizyczny: Bibliogr. 13 poz., rys., tab., wykr.

Twórcy

autor

Brodziak A.

autor

Stradomski Z.

autor

Pirek A.

• Department of Materials Science, Technical University of Częstochowa, Poland,

Bibliografia

• [1] Z. Stradomski , A. Pirek, S. Stachura, Studying possibilities to improve the functional properties of metallurgical rolls, Archives of Foundry Engineering, Vol. 8, 1/2008, 331-316.
• [2] A. M. Elwazri, P. Wanjara, S. Yue, The effect of microstructural characteristics of pearlite on the mechanical properties of hypereutectoid steel, Mater. Sc. & Eng. A 404, 91-98, 2005.
• [3] J. Krawczyk, J. Pacyna, P. Grodowski, The influence of heat treatment on structure of hypereutectoid cast steel for mill rolls, XXX Szkoła Inżynierii Materiałowej, Ustroń Jaszowiec 2002, 215-220.
• [4] ASM Metals Handbook Volume 4, Heat Treating, 1991, 85-88; 333-334.
• [5] Z. Stradomski, A. Pirek, D. Dyja, Influence of carbides morphology on fracture toughness of cast steel G200CrMoNi4-3-3. Strength of Materials. 2008, Vol. 40, no 1, 126-129.
• [6] A. Pirek, Z. Stradomski, D. Dyja, Structure and mechanical properties hypereutectiod cast steel G200CrMoNi4-3-3, METAL 2006. 15 th International Metallurgical & Materials Conference Ostrawa 2006, CD, 142.
• [7] E. Rożniata, The role of cementite in the process of cracking of the L200HNM cast steel, Ph. D. dissertation , AGH, Kraków 2008 (in Polish).
• [8] J. Krawczyk, J. Pacyna, E. Rożniata, The influence of heat treatment and cooling rate on structure of G200CrMoNi4-6-3 cast steel, Inżynieria Materiałowa no 2, 45-52, 2006.
• [9] A. Brodziak, Z. Stradomski, Z. Bałaga, Analysis of heat treatment modification possibility of metallurgical rollers made from G200CrMoNi4-3-3, X Międzynarodowa Konferencja Naukowa "Nowe Technologie i Osiągnięcia w Metalurgii i Inżynierii Materiałowej", Częstochowa 2009 (in Polish).
• [10] Z. Stradomski, A. Pirek, A. Brodziak, Role of the ledeburite in the wear resistance mechanism of the hypereutectoid cast steel, IX Międzynarodowa Konferencja Naukowa "Nowe Technologie i Osiągnięcia w Metalurgii i Inżynierii Materiałowej", Częstochowa, 2008, 476-480 (in Polish).
• [11] K. H. Zum Gahr, Microstructure and wear of materials. Tribology- series 10, Elsevier Amsterdam 1987, s. 227÷252.
• [12] A. Fernandez-Vicente, M. Carsi, F. Penalba, E. Taleff, O. A. Ruano, Toughness dependence on the microstructural parameters for an ultrahigh carbon steel (1.3 wt % C), Mater. Sc. & Eng. A 335, 175-185, 2002.
• [13] Z. Stradomski, S. Stachura, A. Pirek, P. Chmielowiec, The affect of the amout of primary carbides on the wear resistance of the G200CrMoNi4-3-3 (L200HNM) cast steel, Inżynieria Materiałowa, no 3, XX-XXIV, 2004.