Structural changes in low alloy cast steel Cr-Mo-V after long time creep service

• Autorzy: Zieliński A. , Dobrzański J. , Krztoń H.
• Języki publikacji: EN

Abstrakty

EN

Purpose: of this publication is to present the changes of the structure in the power station boiler and turbine components made of low cast steel Cr-Mo-V after long time creep service. Design/methodology/approach: The material of the research studies has been obtained from Polish power stations. All examined elements have exceeded their assessed life of 100.000 hours. The microstructures of the elements have been observed using a scanning electron microscope. The investigation of the development of the precipitation processes has been done by X-ray diffraction phase analysis. Findings: The microstructures and phase compositions of the residues, obtained from the elements, depend on life exhaustion extent. Practical implications: The presented method can be used for evaluation and qualification of structural changes in power station boiler and turbine components operating in creep conditions. Originality/value: The observed changes in the structure and in the precipitation composition are applied to evaluation of the condition of the components in further industrial exploitation.

Słowa kluczowe

EN

metallic alloys; phase analysis; low-alloy cast steel Cr-Mo-V; degradation

PL

stopy metaliczne; analiza fazowa; staliwo niskostopowe Cr-Mo-V; degradacja

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2007
• Tom: Vol. 25, nr 1
• Strony: 33--36
• Opis fizyczny: Bibliogr. 16 poz., fot., tab.

Twórcy

autor

Zieliński A.

autor

Dobrzański J.

autor

Krztoń H.

• Institute for Ferrous Metallurgy, ul. K. Miarki 12/14, 44-100 Gliwice, Poland,

Bibliografia

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• [3] D. Renowicz, A. Hernas, M. Cieśla, K. Mutwil, Degradation of the cast steel parts working in power plant pipelines, Journal of Achievements in Materials and Manufacturing Engineering 18 (2006) 219-222.
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• [10] J. Dobrzański, Internal damage processes in low alloy chromium-molibdenum steels during high-temperature creep service, Journal of Materials Processing technology 157-158 (2004) 197-303.
• [11] J. Dobrzański, The classification method and the technical condition evaluation of the critical elements material of power boilers in creep service made from the 12Cr-lMo-V, Journal of Materials Processing technology 164-165 (2005) 785-794.
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• [14] S. Krol, M. Pietrzyk, Formation of corrosion products protecting surfaces of the boiler proper tubes from the combustion chamber, Journal of Achievements in Materials and Manufacturing Engineering 21 (2007) 45-48.
• [15] A. Zieliński, Residual life of Cr-Mo-V low-alloyed cast steel after long-term service in creep condition, Report of Institute for Ferrous Metallurgy IFM SO-0574 (2006).
• [16] D. Renowicz, M. Ciesla, Crack initiation in steel parts working in boilers and steam pipelines, Journal of Achievements in Materials and Manufacturing Engineering 21 (2007) 49-52.