Mechanical properties of Cr-Mo and Cr-Mo-V low-alloy steel welded joints after long-term service under creep conditions

• Autorzy: Dziuba-Kałuża M. , Dobrzański J. , Zieliński A.
• Języki publikacji: EN

Abstrakty

EN

Purpose: The purpose of this paper was to evaluate mechanical properties of 13CrMo4-5 and 14MoV6-3 steel homogeneous circumferential welded joints after long-term service under creep conditions much beyond the design work time of 100,000 hours and their suitability for further service. Design/methodology/approach: Mechanical properties of individual elements of welded joints in non-destructive tests were determined. In particular, the brittle fracture appearance transition temperature as well as strength and plastic properties at room and elevated temperature were determined. Findings: The influence of long-term service on strength and plastic properties and on impact strength of tested material of 13CrMo4-5 and 14MoV6-3 steel homogeneous circumferential welded joints after long-term service under creep conditions beyond the design work time was determined. Research limitations/implications: The evaluation of suitability of the applied test methods in extension of service period for materials of welded joints of elements working under creep conditions after having exceeded the design work time was made. Practical implications: The obtained test results are used in creation of materials characteristics to allow predicting the life time of tested steels and their welded joints and are used for condition assessment and prediction about further operation of welded joints of elements in the pressure part of power equipment working under creep conditions. Originality/value: The applied methodology and developed materials characteristics are used for condition assessment and prediction about further safe operation of welded joints of elements in the pressure part of power equipment working under creep conditions.

Słowa kluczowe

EN

welded joint; mechanical properties; Cr-Mo steel

PL

złącze spawane; właściwości mechaniczne; stal Cr-Mo

• Wydawca: International OCSCO World Press
• Czasopismo: Archives of Materials Science and Engineering
• Rocznik: 2013
• Tom: Vol. 63, nr 1
• Strony: 5--12
• Opis fizyczny: Bibliogr. 16 poz.

Twórcy

autor

Dziuba-Kałuża M.

• 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

Zieliński A.

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

Bibliografia

• [1]J. Dobrzański, Materials science interpretation of the life of steels for power plants, Open Access Library, Volume 3, 2011, 1-228 (in Polish).
• [2]A. Hernas, Materials and technologies for construction of supercritical boilers and waste incinerators, Joint Publication, Katowice, 2009.
• [3]A. Hernas, T. Wala, Selection of materials for superheaters with improved performance parameters; Materials and technologies used for construction of supercritical boilers and waste incinerators. Publishing House of the Polish Association of Metallurgical Engineers and Technicians (SITPH), Katowice, 2009.
• [4]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.
• [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, Advances in Materials Technology for Fossil Power Plants 2007, Proceedings of the 5th International Conference ASM International, 2008, 616-626.
• [6]J. Dobrzański, H. Krztoń, A. Zieliński, 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.
• [7]S. Stachura, Changes in structure and mechanical properties in steels and cast steels operated at elevated temperatures. Energetics 2 (1999) 109-115.
• [8]A. Zieliński, J.Dobrzański, T. Jóźwik, Assessment of loss in life time of the primary steam pipeline material after long-term service under creep conditions, Journal of Achievements in Materials and Manufacturing Engineering 54/1 (2012) 67-74.
• [9]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.
• [10]J. Okrajni, K. Mutwil, M. Cieśla, Steam pipelines’ effort and durability, Journal of Achievements in Materials and Manufacturing Engineering 22/2 (2007) 63-66.
• [11]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 (2005) 69-72.
• [12]G. Golański, Effect of the heat treatment on the structure and properties of GX12CrMoVNbN9-1 cast steel, Archives of Materials Science and Engineering 46/2 (2010) 88-97.
• [13]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 23/1 (2007) 219-222.
• [14]J. Ćwiek, Evaluation of microstructure and mechanical properties of a steam turbine casing after long-term service, Journal of Achievements in Materials and Manufacturing Engineering 49/1 (2011) 27-34.
• [15]J. Ćwiek, Hydrogen degradation of high-strength steels, Journal of Achievements in Materials and Manufacturing Engineering 37/2 (2009) 193-212.
• [16]D. Renowicz, M. Cieśla, Crack initiation in steel parts working in boilers and steam pipelines, Journal of Achievements in Materials and Manufacturing Engineering 21/2 (2007) 49-52.