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Crack resistance of tool steels corresponding with the chemical composition of their matrices

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Języki publikacji
EN
Abstrakty
EN
Purpose: of the presented investigations was showing that the crack resistance of tool steels depends on their hardenability and phase transformations occurring in the quenched matrix at tempering. The chemical composition of austenite decides on the steel hardenability while phase transformations after tempering can be influenced (apart from the chemical composition) by the heating method. Design/methodology/approach: of investigations was based on the analysis of dilatograms and the achieved aim was to obtain the hard tool steel (app. 500 HV30) for hot works. Samples of a diameter of 10 mm (without a notch) made of this steel were not broken by the Charpy impact test of energy of 30 kGm. Findings: of these investigations are practical. Grain boundaries of prior austenite should be protected against secondary precipitates, which constitute natural nuclei of diffusive structures. It is also possible to control phase transformations at tempering. Research limitations/implications: constitute the availability of the adequate equipment for investigating the kinetics of phase transformations of undercooled austenite and the kinetics of phase transformations after tempering. Practical implications: for the industry are such that the proposed tool steels of a high crack resistance contain molybdenum and nickel. Thus, these steels are very expensive. Originality/value: of these investigations was confirmed in the industrial practice.
Rocznik
Strony
5--14
Opis fizyczny
Bibliogr. 24 poz.
Twórcy
autor
  • Department of Metallurgical Metallurgy and Powder Metallurgy, Faculty of Metals Engineering and Industrial Informatics, AGH University of Science and Technology, ul. Czarnowiejska 66, 30-054 Kraków, Poland
Bibliografia
  • [1] J. Pacyna, L. Witek, The effect of carbides on fracture toughness of steels of ferritic matrix, Steel Research 59/2 (1988) 68-74.
  • [2] J. Pacyna, A. Mazur, Einfluss des Molybdans auf die Zähigkeit von Schnellarbeitsstählen, Archiv für das Eisenhüttenwesen 53/4 (1982) 151-156 (in German).
  • [3] G.A. Roberts, J.C. Hamaker, A.R. Johnson, Tool Steels, 3rd Edition, ASM, Metals Park, Ohio, 1962.
  • [4] J. Pacyna, The effect of molybdenum on the transformations in the quenched matrix of high-speed steels during tempering, Archiv für das Eisenhüttenwesen 55/7 (1984) 325-330.
  • [5] J. Pacyna, R. Dbrowski, The kinetics of phase transformations of model alloys with vanadium at tempering, Proceedings of the 10th Jubilee International Scientific Conference “Achievements in Mechanical and Materials Engineering” AMME’01, Gliwice – Cracow – Zakopane, Poland, 2001, 417- 422.
  • [6] G. Zajc, J. Pacyna, The effect of nickel on mechanical properties of structural steels model alloys, Proceedings of the 11th International Scientific Conference “Contemporary Achievements in Mechanics, Manufacturing and Materials Science” CAM3S, Gliwice – Zakopane, Poland, 2005, 1061- 1065.
  • [7] J. Pacyna, The effect of retained austenite on the fracture toughness of high-speed steels, Steel Research 58/2 (1987) 87-92.
  • [8] J. Pacyna, A. Mazur, Effect of molybdenum on the fracture toughness of high-speed quenched matrix, Archiv für das Eisenhüttenwesen 55/12 (1984) 609- 614.
  • [9] J. Adamczyk, L.A. Dobrzański, E. Hajduczek, Wpływ obróbki cieplnej na strukturę i własności mechaniczne stali szybkotnącej SW12C, Hutnik 42/12 (1975) 479- 485 (in Polish).
  • [10] P. Bała, J. Pacyna, The kinetics of phase transformations during tempering in high-speed steels, Journal of Achievements in Materials and Manufacturing Engineering 23/2 (2007) 15-18.
  • [11] P. Bała, J. Pacyna, The Influence of Pre-Tempering on the Mechanical Properties of HS6-5-2 High Speed Steel, Archives of Metallurgy and Materials 53/3 (2008) 795-801.
  • [12] A. Kokosza, J. Pacyna, Effect of retained austenite on the fracture toughness of tempered tool steel, Archives of Materials Science and Engineering 31/2 (2008) 87- 90.
  • [13] A.F. Retana, D.V. Doane, Predicting Hardenability of Carburizing Steels, Metal Progress 100 (1971) 65-69.
  • [14] C.F. Jatczak, Hardenability in High Carbon Steels, Metallurgical Transactions 4/10 (1973) 2267-2277.
  • [15] G.T. Eldis, Proceedings of a Symposium on the Hardenability Concepts with Applications to Steel, held at the Sheraton Hotel, October, 1977.
  • [16] G. Zajc, J. Pacyna, Kinetics of phase transformations under-cooled austenite in steels of different content of nickel, Hutnik – Wiadomości Hutnicze 71/7-8 (2004) 443-445 (in Polish).
  • [17] M.A. Grossmann, Elements of Hardenability, American Society for Metals, Cleveland, 1952.
  • [18] T. Malkiewicz, Physical Metallurgy of Iron Alloys, PWN, Warsaw-Cracow, 1976 (in Polish).
  • [19] E. Houdremont, Handbuch der Sonderstahlkunde, Springer Verlag, Berlin, 1956 (in German).
  • [20] J. Pacyna, M. Strach, The CHT (Continuous Heating Transformations) curves for structural steels with silicon, Proceedings of the 14th International Scientific Conference “Advanced Materials and Technologies”, Gliwice-Zakopane, 1995, 345-348.
  • [21] J. Pacyna, M. Niewcas, Koagulacja wysokotemperaturowa węglików w stalach szybkotncych (in Polish).
  • [22] A. Kokosza, Pacyna J.: Evaluation of retained austenite stability in heat treated cold work tool steel, Journal of Materials Processing Technology 162-163 (2005) 327-331.
  • [23] A. Kokosza, J. Pacyna, Mechanical Stability of Retained Austenite in Unalloyed Structural Steel of Various Carbon Content, Archives of Metallurgy and Materials 55/4 (2010) 1001-1006.
  • [24] J. Pacyna, Steels for metallurgical products, Vol. III, Rolls-Rolls Inc., Cracow, 2017 (in Polish).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-adab1d6e-fd09-4541-b7b7-bb5d365b3a82
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