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Purpose: The paper presents the influence of heat treatment parameters (austenitization and tempering temperature) on the microstructure and mechanical properties of high - chromium martensitic GX12CrMoVNbN9-1 (GP91) cast steel. Moreover, the influence of stress relief annealing at the temperatures of 730 and 750oC on microstructure and properties has been investigated. Design/methodology/approach: Microstructure of the cast steel was characterized using optical metallography and transmission electron microscopy. Identification of precipitates was made by means of thin foils and extraction carbon replicas. The size of precipitations was determined by Image Pro Plus software. Moreover, the mechanical properties (static tension, hardness and impact energy) have been tested. Findings: What has been determined is the influence of heat treatment parameters on microstructure and mechanical properties of GP91 cast steel. Heat treatment (hardening and high-temperature tempering) of GP91 cast steel allowed to obtain a fine-grained microstructure of high-tempered martensite with numerous precipitates whose properties met the standard requirements, regardless of the heat treatment parameters. Research limitations/implications: It is necessary to continue the research to determine description of the microstructure after different heat treatment parameters. Practical implications: Optimization of the heat treatment parameters from the aspect of using the investigated cast steel for long-term operation in power units designed for working at the so-called supercritical parameters. Originality/value: The relationship between the heat treatment parameters (austenitization and tempering temperatures) and mechanical properties of high - chromium martensitic GX12CrMoVNbN9-1 (GP91) cast steel was specified. Moreover, the influence of the stress relief annealing parameters on microstructure and properties has been shown.
Wydawca
Rocznik
Tom
Strony
88--97
Opis fizyczny
Bibliogr. 18 poz.
Twórcy
autor
- Institute of Materials Engineering, Częstochowa University of Technology, Al. Armii Krajowej 19, 42-200 Czestochowa, Poland, grisza@wip.pcz.pl
Bibliografia
- [1] A. Hernas, Conditions for the development of the Polish power engineering industry-introduction tomonograph, Materials and Technology for Construction of Supercritical Boilers and WastePlants, (edited by A. Hernas), SITPH Publ., Katowice, 2009, 8-11 (in Polish).
- [2] A. Czyrska-Filemonowicz, A. Zielińska- Lipiec, P.J. Ennis, Modified 9%Cr steels for advanced power generation: microstructure and properties, Journal of Achievements in Materials and Manufacturing Engineering 19/2 (2006) 43-48.
- [3] A. Zielińska-Lipiec, The analysis of microstructural stability of modified martensitic 9%Cr steel during annealing and creep deformation, AGH Publ., Cracow, 2005 (in Polish).
- [4] A. Hernas, G. Moskal, K. Rodak, J. Pasternak, Properties and microstructure of 12%Cr-W steels after long-term service, Journal of Achievements in Materials and Manufacturing Engineering 17 (2006) 69-72.
- [5] G. Golański, S. Stachura, Characterization of new low alloy steels for power plant, Metallurgist 9 (2009) 679-683 (in Polish).
- [6] A. Zieliński, J. Dobrzański, G. Golański, Estimation of the residual life of L17HMF cast steel elements after long-term service, Journal of Achievements in Materials and Manufacturing Engineering 34/2 (2009) 137-144.
- [7] A. Zieliński, J. Dobrzański, H. Krztoń, Structural changes in low alloy cast steel Cr- Mo-V after long time creep service, Journal of Achievements in Materials and Manufacturing Engineering 25/1 (2007) 33-36.
- [8] G. Golański, Mechanical properties of G17CrMoV5-10 cast steel after regenerative heat treatment, Solid State Phenomena 147-149 (2009) 732-737.
- [9] H.K. Mayer, H. Cerjak, P. Hofer, E. Letofsky, F. Schuster, Evolution of microstructure and properties of 10% Cr steel castings, Microstructural development and stability in high chromium ferritic power plant steels, (Edited by A. Strang, D.J. Gooch), The Institute of Materials, London, 1997, 105-122.
- [10] R. Hanus, Advanced 9-12%Cr cast steel grades, research-foundry process development-quality-experience, Proceedings of the 4th International Conference “Advances in Materials Technology for Fossil Power Plants”, Hilton Head Island, South Carolina, 2004, 638-651.
- [11] G. Golański, High chromium martensitic cast steels for power plant, Energetics 21 (2010) 58-61 (in Polish).
- [12] ECCC Data Sheet, 2005.
- [13] J. Janovec, M. Svoboda, J. Blach, Evolution of secondary phases 12% Cr steel during quenching and tempering, Materials Science and Engineering A 249 (1998) 184-189.
- [14] N.E. Hannerz, U. Lindborg, B. Lehtinen, Brittleness in a cast steel caused by NbC precipitation, JISI 128 (1968) 68-73.
- [15] G. Golański Influence heat treatment parameters on microstructure and mechanical properties of high-chromium GX12CrMoVNbN9-1 (GP91) cast steel, Materials Engineering 6 (2010) 1441-1445.
- [16] Qiang Li, Modeling the microstructure-mechanical property relationship for a 12Cr-2W-V-Mo-Ni power plant steel, Materials Science and Engineering A 361 (2003) 385-391.
- [17] S. Rajca, E. Grzesiczek, Material state of steam turbine casing after the repair with welding, Energetics 12 (2001) 777-780 (in Polish).
- [18] K. Czarnota, Precipitation processes in GX12CrMoVNbN9- 1 cast steel after different heat treatment, MSc. Thesis, Czestochowa, 2010 (in Polish).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BSL8-0040-0019