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Abstrakty
Purpose: Present work corresponds to the research on the kinetic of phase transformation of undercooled austenite of 37MnNiMo6-4-3 hypoeutctoid steel. The kinetic of phase transformation of under cooled austenite of investigated alloy was presented on CCT diagram (continuous cooling transformation). Also the methodology of a dilatometric samples preparation and the method of the critical points determination were described. Design/methodology/approach: The austenitising temperature was defined in a standard way i. e. 30-50°C higher than Ac3 temperature for hypoeutectoid steels. The technology of full annealing was proposed for the iron based alloy. The CCT diagram was made on the grounds of dilatograms recorded for samples cooled with various rates. The microstructure of each dilatometric sample was photographed after its cooling to the room temperature and the sample hardness was measured. Also EDS analysis was performed using scanning microscope. Findings: The test material has been hypoeutectoid steel. These steels represent a groups of alloy steels for quenching and tempering. The microstructure of test 37MnNiMo6-4-3 hypoeutectoid steel on CCT diagram changes depending on the cooling rate. Research limitations/implications: The new hypoeutectoid steel and new CCT diagram. Practical implications: The paper contains a description of one from a group of iron based model alloys with 0.35-0.40% carbon content. According to PN-EN 10027 standard this steel should have a symbol 37MnNiMo6-4-3. Originality/value: The new hypoeutectoid steel (Mn-Ni-Mo iron based model alloy).
Wydawca
Rocznik
Tom
Strony
24--30
Opis fizyczny
Bibliogr. 15 poz., rys., tab.
Twórcy
autor
- Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, Al. A. Mickiewicza 30, 30-059 Kraków, Poland
Bibliografia
- [1] J. Trzaska, A. Jagiełło, L.A. Dobrzański, The calculation o CCT diagrams for engineering steels, Archives of Materiale Science and Engineering 39/1 (2009) 13-20.
- [2] Grajcar, M. Opiela, Influence of plastic deformation on CCT- diagrams of low-carbon and medium-carbon TRIP-steels, Journal of Achievements in Materials and Manufacturing Engineering 29/1 (2008) 71-78.
- [3] P. Bała, J. Pacyna, J. Krawczyk. The kinetics of phase transformations during the tempering of HS18-0-1 high-speed steel, Journal of Achievements in Materials and Manufacturing Engineering 19 (2006) 19-25.
- [4] P. Bała, J. Pacyna, The influence of kinetics o phase transformations during tempering on high-speed steels mechanical properties, Journal of Achievements in Materials and Manufacturing Engineering 43 (2010) 64-71.
- [5] P. Bała, J. Pacyna, J. Krawczyk. The kinetics of phase transformations during tempering of Cr-Mo-V medium carbon steel, Journal of Achievements in Materials and Manufacturing Engineering 20 (2007) 79-82.
- [6] R. Dziurka, J. Pacyna, The influence of carbon content on the kinetics of phase transformations of undercooled austenite of the Cr-Mn-Mo model alloys, Archives of Materiale Science and Engineering 47 (2011) 77-84.
- [7] E. Rożniata, R. Dziurka, J. Pacyna, The kinetics of phase transformations of undercooled austenite of the Mn-Ni iron based model alloy, Journal of Achievements in Materials and Manufacturing Engineering 49/2 (2011) 188-192.
- [8] Grajcar, W. Zalecki, R. Kuziak, Designing of cooling conditions for Si-Al microalloyed TRIP steel on the basis of DCCT diagrams, Journal of Achievements in Materials and Manufacturing Engineering 45/2 (2011) 115-124.
- [9] E. Rożniata, R. Dziurka, R. Dąbrowski, The kinetics of phase transformations of undercooled austenite of the 38MnCrNi6-4-4 hypoeutectoid steel, Journal of Achievements in Materials and Manufacturing Engineering 55/2 (2012) 280-284.
- [10] E. Rożniata, R. Dziurka, Analysis of the microstructure of 37MnMo6-3 hypoeutectoid steel, Archives of Materials Science and Engineering 47/2 (2012) 125-129.
- [11] J. Trzaska, L.A. Dobrzański, Application of neural networks for selection of steel with the assumed hardness after cooling from the austenitising temperature, Journal of Achievements in Materials and Manufacturing Engineering 16/1-2 (2006) 145-150.
- [12] L.A. Dobrzański, S. Malara, J. Trzaska, Project of computer program for designing the steel with the assumed CCT diagram, Journal of Achievements in Materials and Manufacturing Engineering 20/1-2 (2007) 351-354.
- [13] J. Nowacki, Phosphorus in iron alloys surface engineering, Journal of Achievements in Materials and Manufacturing Engineering 24 (2007) 57-67.
- [14] G. Niewielski, D. Kuc, I. Schindler, I. Bednarczyk, Hot rolling of intermetallics FeAl phase based alloys, Archives of Materials Science and Engineering 29 (2008) 117-120.
- [15] F. Wever, A. Rose. Atlas zur Wärmebehandlung der Stähle, Verlag Stahleisen, Düsseldorf, 1958.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-9c384430-a6e1-451e-b105-05990813998a