Assessment of loss in life time of the primary steam pipeline materiał after long-term service under creep conditions

• Autorzy: Zieliński A. , Dobrzański J. , Jóźwik T.
• Języki publikacji: EN

Abstrakty

EN

Design/methodology/approach: For material of the pipeline after long-term service the microstructure investigations in a scanning electron microscope, phase composition analysis of precipitations, hardness measurement at the point where structure was observed and mechanical testing at room temperature were carried out. In addition, the magnetic particle inspections and ultrasonic testing were carried out over the entire volume of the pipeline sample. Findings: The life exhaustion extent of the investigated steel 14MoV6-3 estimated based on the metallographic tests is much higher than the expected one for the investigated steel at the current working parameters of the pipeline. Correct evaluation of the pipeline material condition during the periodic diagnostic testing, including but not limited to that performed by the matrix replica method, allows the excessive loss in life time of the material to be revealed and the reason for premature destruction of the pipeline components to be diagnosed and removed early enough. Practical implications: The presented method can be used for evaluation and qualification of structural changes in power station boiler components operating under creep conditions. Originality/value: The presented results of changes in the mechanical properties, structure and in the precipitation processes are applied to evaluate the condition of the elements in further industrial service.

Słowa kluczowe

EN

structure; degradation; hardness; creep; steel 14MoV6-3

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2012
• Tom: Vol. 54, nr 1
• Strony: 67--74
• Opis fizyczny: Bibliogr. 19 poz., rys., tab.

Twórcy

autor

Zieliński A.

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

autor

Dobrzański J.

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

autor

Jóźwik T.

• Tedspaw, ul. Z. Klembowskiego 4, 25-829 Kielce, Poland

Bibliografia

• [1] A. Hernas, J. Dobrzański, Life-time and damage of boilers and steam turbines elements, Publishing House of the Silesian University of Technology, Gliwice, 2003 (in Polish).
• [2] J. Dobrzański, Materials science interpretation of the life of steels for power plants, Open Access Library 3 (2011) 1-228 (in Polish).
• [3] J. Okrajni, A. Marek, G. Junak, Description of the deformation process under thermo-mechanical fatigue, Journal of Achievements in Materials and Manufacturing Engineering 21/2 (2007) 15-24.
• [4] J. Okrajni, A. Marek, G. Junak, Stress - strain characteristics under mechanical and thermal loading. Journal of Achievements in Materials and Manufacturing Engineering 20 (2007) 271-274.
• [5] A. Zieliński, J. Dobrzański, D. Renowicz, A. Hernas, The estimation of residual life of low-alloy cast steel Cr-Mo-V type after long-term creep service, Proceedings of the 5th International Conference on „Advances in Material Technology for Fossil Power Plants”, Marco Island, 2007, 34.
• [6] J. Dobrzański, A. Zieliński, Residual life of 13HMF steel after long-term service creep condition for 200 thousand hours, Transactions of the IMŻ 59/4 (2007) 54-57.
• [7] J. Dobrzański, M. Sroka, A. Zieliński, Methodology of classification of internal damage the steels during creep service, Journal of Achievements in Materials and Manufacturing Engineering 18 (2006) 263-266.
• [8] J. Dobrzański, Internal damage processes in low alloy chromium-molybdenum steels during high-temperature creep service, Journal of Materials Processing Technology 157-158 (2004) 297-303.
• [9] A. Zieliński, A. Hernas, Forecasting residual life of cast steel elements of pipelines working under creep and fatigue conditions, Transaction of the IMŻ 4 (2008) 1-17 (in Polish).
• [10] 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.
• [11] J. Dobrzański, Material characteristics of steel 14MoV63 (13HMF) after long-term service under creep conditions as necessary components of the evaluation of condition of power boiler elements in the pressure section and of their usability for further service beyond the design work time, Energetics XIX (2009) 33-39 (in Polish).
• [12] J. Dobrzański, A. Zieliński, M. Sroka, Structure, properties and method of the state evaluation of low-alloyed steel T23 (HCM2S) worked in creep conditions, Proceedings of the “Contemporary Achievements in Mechanics, Manufacturing and Materials Science” CAMSS'2005, Gliwice-Zakopane, 2005, 171-180.
• [13] J. Dobrzański, A. Zieliński, H. Krztoń, Mechanical properties and structure of the Cr-Mo-V low-alloyed steel after long-term service in creep condition, Journal of Achievements in Materials and Manufacturing Engineering 23/1 (2007) 39-42.
• [14] J. Dobrzański, A. Zieliński, H. Krztoń, Development of the precipitation processes in low-alloy Cr-Mo type steel for evolution of the material state after exceeding the assessed lifetime, Journal of Achievements in Materials and Manufacturing Engineering 23/2 (2007) 19-22.
• [15] J. Dobrzański, A. Zielinski, M. Sroka, Microstructure, properties investigations and methodology of the state evaluation of T23 (2.25Cr-0,3Mo-1.6W-V-Nb) steel in boilers application, Journal of Achievements in Materials and Manufacturing Engineering 32/2 (2009) 142-153.
• [16] A. Zieliński, J. Dobrzański, D. Renowicz, A. Hernas, The estimation of residual life of low-alloy cast steel Cr-Mo-V type after long-term creep service, Advances in Materials Technology for Fossil Power Plants 2007, Proceedings of the 5th International Conference ASM International, 2008, 616-626.
• [17] G. Golański, S. Stachura, Characterization of new-low alloy steels for power plant, Metallurgy - Metallurgical Engineering News 76/9 (2009) 679-683.
• [18] J. Okrajni, K. Mutwil, M. Cieśla, Steam pipelines’ effort and durability, Journal of Achievements in Materials and Manufacturing Engineering 22/2 (2007) 63-66.
• [19] J Dobrzański, A Zieliński, M Sroka, The influence of simultaneous impact of temperature and time on the properties and structure of X10CrWMoVNb9-2 steel, Journal of Achievements in Materials and Manufacturing Engineering 34/1 (2009) 7-14.