Hypereutectoid cementite morphology and mechanical properties of Cr-Ni-Mo cast steel
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Purpose: The paper presents evaluation of the influence of grain normalization (refinement as a result of repeated austenitizing), cooling rate after repeated austenitizing on the morphology of hypereutectoid cementite and fracture toughness of G200CrMoNi4-6-3 cast steel. Moreover, the elimination of hypereutectoid cementite in structure of Widmannstätten type precipitates from the structure of investigated cast steel has been undertaken. Design/methodology/approach: Basic research of G200CrMoNi4-6-3 cast steel included metallographic analysis and fracture toughness research (impact strength, stress intensity factor KIc). The heat treatment has been planned on the basis of CCT diagram prepared for that cast steel. Findings: Heat treatment of investigated cast steel allows to refine the grain and eliminate from it’s structure the hypereutectoid cementite in structure of Widmannstätten type. At very low cooling rate the precipitates of hypereutectoid cementite become partially coagulated. The study of the influence of cooling rate on the mechanical properties of G200CrMoNi4-6-3 cast steel had proven that elimination of hypereutectoid cementite in structure of Widmannstätten type from the investigated cast steel structure to small degree increases it’s fracture toughness. Research limitations/implications: Research financed by the Ministry of Scientific Research and Information Technology, grant No. 3 T08B 057 29. Practical implications: G200CrMoNi4-6-3 cast steel of ledeburite class is used mainly for rolls production. Any data related to the structure and mechanical properties of that cast steel are precious for the manufacturers and users of the mill rolls. Originality/value: The new heat treatment of G200CrMoNi4-6-3 cast steel.
Bibliogr. 16 poz., rys., tab., wykr.
- Faculty of Foundry Engineering, AGH University of Science and Technology, Al. A. Mickiewicza 30, 30-059 Kraków, Poland, firstname.lastname@example.org
- Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, Al. A. Mickiewicza 30, 30-059 Kraków, Poland
-  J. Głownia: Metallurgy and Foundry Engineering, Kraków-Koninki, XX 1987, V. 111, pp. 215-220 (in Polish).
-  S. Stachura, T. Borek, J. Jańczyk: Metallurgy and Foundry Engineering, Kraków-Koninki, XX 1987, V. 111, pp. 203-207 (in Polish).
-  J. Pacyna, J. Krawczyk, A. Kokosza: Specifying reasons for easily appearing fractures in rolls made of L200HNM cast steel, Work of the Faculty of Metallurgy and Materials Science, AGH University of Science and Technology, Kraków 1999 (in Polish).
-  Z. Stradomski, A. Pirek, S. Stachura, P. Chmielowiec: The effect of the Mount of primary carbides on the wear resisitence of the G200CrMoNi4-6-3 cast steel, Materials Engineering, May-June 2004, No. 3, pp. XX-XXIII.
-  J. Krawczyk, J. Pacyna, A. Kokosza: 6th International Conference for Mesomechanics „Multiscaling in Applied Science and Emerging Technology – Fundamentals and Applicatis in Mesomechnics”, Patras, Greece, 31 May–4 June, 2004, pp. 203-207.
-  J. Pacyna, J. Krawczyk: Effect of heat treatment upon ledeburite transformed morphology in proeutectoid cast steel, 10th Jubilee International Scientific Conference „Achievements in Mechanical and Materials Engineering” AMME’2001, Gliwice-Kraków-Zakopane, 2001, pp.429-434.
-  J. Krawczyk, J. Pacyna: The rolle of transformed ledeburite in high temperature tribology on the example of adamite rolls, Mat. Contemporary Achievements in Mechanics and Manufacturing and Materials Science, Gliwice-Zakopane 2005, pp. 535-540.
-  J. Kurian, M. Šlesár: The effect of Widmannstätten structure on properities of mild steels, Zbiorník Vedeckých Prác, 1978, No. 2, pp. 279-292
-  M. Durand-Charre: Microstructure of Steels and Cast Irons, Berlin-Heidelberg-New York 2004.
-  Steel - A Handbook for Materials Research and Engineering, V1: Fundamentals, VDE, Berlin-Heidelberg-New York-London-Paris 2004.
-  J. Krawczyk, E. Rożniata, J. Pacyna: The influence of hypereutectoid cementite morphology upon fracture toughness of chromium-nickel-molybdenum cast steel of ledeburite class, Journal of Materials Processing Technology 162-163 (2005) 336-341.
-  J. Pacyna Performance of CCT-diagram for L200HNM cast steel, Work of the Faculty of Metallurgy and Materials Science, AGH University of Science and Technology, Kraków, May 2003 (in Polish).
-  E. Skrzypczak, J. Pacyna: The influence of heat treatment on Widmannstätten structure in cast steel, XXXI School of Materials Engineering, Kraków-Krynica 7-10 X 2003, pp. 187-193 (in Polish).
-  E. Rożniata, J. Pacyna: The influence of cooling rate on inclination to emanation proeutectoide cementite in Widmannstätten structure in Cr-Ni-Mo cast steel, XXXII School of Materials Engineering, Kraków-Krynica 28 IX-1 X 2004, pp. 231-235 (in Polish).
-  J. Pacyna, A. Mazur: The influence of grain size upon the fracture toughness of the hot-work tool steel, Scandinavian Journal of Metallurgy, vol. 12, 1983, Nr 1, pp. 22-28.
-  J. Pacyna, A. Mazur: Relationship between the grain size and fracture toughness of tool steel, Steel Research, vol. 57, 1986, Nr 11, p. 577-585.