Quantitative characterisation of the microstructure high chromium steel with boron for advanced steam power plants

• Autorzy: Zielińska-Lipiec A. , Kozieł T. , Czyrska-Filemonowicz A.
• Języki publikacji: EN

Abstrakty

EN

Purpose: The purpose of the paper is to characterize the microstructure of high chromium steel with boron for advanced steam power plants. Design/methodology/approach: The microstructure of new 12% chromium steel developed for advanced power stations operated around 625-650 °C, has been characterized in order to correlate its structural parameters with steel creep properties. Microstructure of the as received condition has a significant influence on creep resistance of 9-12% Cr steels operating at elevated temperatures. Quantitative TEM analyses of steel microstructure were undertaken to determine the dislocation density within the sub-grain, the width of the martensite laths/sub-grains and the particle parameters (shape, size, distribution). Phase identification was performed using electron diffraction and X-ray spectrometry. The influence of the austenitisation temperature (1060 -1100 şC) on the microstructure of the VM12 steel with 145ppm boron was investigated. Findings: The results show that increase of the austenisation temperature caused slight increasing of a sub-grain size and decreasing of dislocation density within sub-grains in the steel tempered at 780 şC. The M23C6 and MX particle size was not significantly changed. Quantitative TEM analyses of the VM12 steel microstructure showed that favorable characteristics exhibit the steel which was austenised at 1060 °C. Research limitations/implications: The present study is focused on the influence of temperature of autenitisation on the microstructure of the VM12 steel with 145ppm boron. The quantitative parameters of the VM12 microstructure were determined. The VM12 steel is a high Cr martensitic steel developed for advanced coal-fired power station operating at temperature higher than 600 şC. Originality/value: Quantitative characterisation of the microstructure high chromium steel with boron for advanced steam power plants.

Słowa kluczowe

EN

VM12 steel; microstructure; boron

PL

stal VM12; mikrostruktura; bor

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2010
• Tom: Vol. 43, nr 1
• Strony: 200--204
• Opis fizyczny: Bibliogr. 10 poz., rys., tabl.

Twórcy

autor

Zielińska-Lipiec A.

autor

Kozieł T.

autor

Czyrska-Filemonowicz A.

• AGH University of Science and Technology, Al. A. Mickiewicza 30, PL-30059 Kraków, Poland,

Bibliografia

• [1] A. Zielinska-Lipiec, K. Spiradek-Hahn, K. Bryla, A. Czyrska-Filemonowicz, Boron in high chromium steels for USC steam power plants, in „Power generation in an era of climate change”, Proceedings of the 7th Int. Charles Parson Turbine Conference, 2007, Glasgow, IOM Communications Ltd, 2007, 497-498.
• [2] H. Semba, F. Abe, Alloy Design and Strength of Advanced 9%Cr USC Boiler Steels Containing High Boron, in Materials for Advanced Power Engineering 2006, Proceedings of the 8th Liege Conference, Energy Technology series, Volume II, Part II, 2006, 1041-1052.
• [3] K. Spiradek-Hahn, P. Nowakowski, G. Zeiler, Boron added 9% Cr Steels for Forged Components in Advanced Power Plants, in Advances in Material Technology for Fossil Power Plants, R. Viswanathan, W.T. Bakker and J.D. Parker (eds), EPRI Report 1001462, Institute of Materials, Book 0770, 2001, 165-176.
• [4] F. Abe, Metallurgy for Long-Term Stabilization of Ferritic Steels for Thick Section Boiler Components in USC Power Plant at 650ºC, in Materials for Advanced Power Engineering 2006, Proceedings of the 8th Liege Conference, Energy Technology series, Volume II, Part II, 2006, 1041-1052.
• [5] A. Zielińska-Lipiec, W. Bendick, T. Kozieł, A. Czyrska-Filemonowicz, Effect of creep deformation at 625 °C on microstructure development of VM12 steel, Proceedings of the ECCC Creep Conference, Zurich, 2009, 619- 627.
• [6] M. Hättestrand, H.O. Andrén, Boron distribution in 9-12% Cr steels, Materials Science and Engineering A-270 (1999) 33-37.
• [7] A. Czyrska-Filemonowicz, A. Zielińska-Lipiec, P.J. Ennis, Modified 9% Cr steels for advanced power generation: microstructure and properties, J. of Achievements in Materials and Manufacturing Engineering 19/2 (2006) 43-48.
• [8] R.K. Ham, The Determination of Dislocation Densities in Thin Film, Phil. Mag. 6 (1961) 1183.
• [9] P.J. Ennis, A. Zielinska-Lipiec, A. Czyrska-Filemonowicz, The influence of heat treatments on the microstructural parameters and mechanical properties of P92 steel, in Qualitative Microscopy of High Temperature Materials. Strang A and Cawley J (eds), IOM Communications Ltd, Book 0732, 2002, 191-206.
• [10] A. Zielinska-Lipiec, W. Bendick. G. Cempura, B. Vandenberghe, P.J. Ennis, A. Czyrska-Filemonowicz, Microstructural Development of VM12 Steel Caused by Creep Deformation at 625 ºC, in Materials for Advanced Power Engineering 2006, Proceedings of the 8th Liege Conference, Energy Technology series, Volume II, Part II, 2006, 1077-1086.