The impact of repair welded joint on the life of Cr-Mo-V steel steam pipeline after service under creep conditions

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

Abstrakty

EN

Purpose: The purpose of this paper was to examine the impact of repair welded joints on the life time of primary steam pipelines after more than 200 000 h service under creep conditions. Design/methodology/approach: The investigations of microstructure using scanning microscopy, investigations of mechanical properties at room and elevated temperature, determination of brittle fracture appearance transition temperature based on impact strength tests and abridged creep tests were carried out in order to determine the residual life of the material. Findings: The completed investigations allowed the time of further safe operation of the elements of primary steam pipeline with repair welded joint to be determined in relation to the parent material and welded joint after service. Practical implications: The assessment of residual life and disposable residual life, and thus the estimation or determination of possible time of further safe operation, is of the essence in case of operating the elements much beyond the design work time. Originality/value: The obtained results of investigations are the elements of material characteristics developed by the Institute for Ferrous Metallurgy for steels and welded joints made from them working under creep conditions.

Słowa kluczowe

EN

creep; diagnostics of material; welded joint; Cr-Mo-V steel; residual life

PL

pełzanie; diagnostyka materiałów; złącze spawane; stal Cr-Mo-V; trwałość resztkowa

• Wydawca: International OCSCO World Press
• Czasopismo: Archives of Materials Science and Engineering
• Rocznik: 2014
• Tom: Vol. 68, nr 1
• Strony: 36--44
• Opis fizyczny: Bibliogr. 20 poz.

Twórcy

autor

Zieliński A.

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

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

Sroka M.

• Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland

Bibliografia

• [1] A. Hernas, Materials and technologies for construction of supercritical boilers and waste incinerators, Joint publication edited by Adam Hernas, Katowice, 2009.
• [2] M. Dziuba-Kałuża, J. Dobrzański, A. Zieliński, Life time of circumferential welded joints of critical elements of Cr-Mo and Cr-Mo-V low-alloy steel boilers after long-term service beyond the design time, Transactions of the IMŻ65/3 (2013) 64-66.
• [3] 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.
• [4] 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).
• [5] J. Dobrzański, Materials science interpretation of the life of steels for power plants, Open Access Library 3 (2011) 1-228.
• [6] J. Dobrzański, B. Kowalski, J. Wodzyński, Technical diagnostics of critical components in the pressure part of power boilers working under creep conditions after exceeding the design work time. Current problems related to construction and operation of boilers, Silesian University of Technology, Transactions of the IMiUE 23/1 (2009) 85-126.
• [7] M. Sroka, A. Zieliński, Matrix replica method and artificial neural networks as a component of condition assessment of materials for the power industry, Archives of Materials Science and Engineering 58/2 (2012) 130-136.
• [8] 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.
• [9] J. Dobrzański, A. Hernas, G. Moskal, Microstructural degradation in power plant steels, Chapter No. 9 in book: J.E. Oakey (ed.), Power plant life management and performance improvement, Woodhead Publishing Limited, Sawston, UK, 2011.
• [10] 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 5thInternational Conference ASM International, 2008, 616-626.
• [11] J. Dobrzański, A. Zieliński, The assessment of suitability of the material of elements of the 14MoV63 (13HMF) steel primary steam pipeline after 200 000 h service under creep conditionsn for further operation, Energetics. Thematic Booklet No. XVIII (2008) 32-36.
• [12] J. Dobrzański, Method for determination of residual life and disposable residual life of materials after long-term service under creep conditions, Energetics. Thematic Booklet No. XVIII (2008) 28-32.
• [13] A. Zieliński, J. Dobrzański, M. Dziuba-Kałuża, Structure of welded joints of 14MoV6-3 and 13CrMo4-5 steel elements after design work time under creep conditions, Archives of Materials Science and Engineering 61/2 (2013) 69-76.
• [14] M. Dziuba-Kałuża, J. Dobrzański. A. Zieliński, Mechanical properties of Cr-Mo and Cr-Mo-V low-alloy steel welded joints after long-term service under creep conditions, Archives of Materials Science and Engineering 63/1 (2013) 5-12.
• [15] 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.
• [16] J. Dobrzański, M. Dziuba-Kałuża, The evaluation of suitability for operation of welded joints of critical elements in the pressure part of power units from Cr-Mo and Cr-Mo-V low-alloy steels after service beyond the design work time based on the investigation of mechanical properties and microstructure, Monograph: Materials and technologies used for construction of boilers with supercritical parameters at up to 700ºC, 2013, 169-189.
• [17] J. Dobrzański, M. Sroka, Computer aided classification of internal damages the chromium-molybdenum steels after creep service, Journal of Achievements in Materials and Manufacturing Engineering 24/2 (2007) 143-146.
• [18] 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 11thInternational Scientific Conference “Contemporary Achievements in Mechanics, Manufacturing and Materials Science” CAM3S’2005, Gliwice-Zakopane, 2005, 4-7.
• [19] A. Zieliński, J. Dobrzański, M. Sroka, Changes in the structure of VM2 steel after being exposed to creep conditions, Archives of Materials Science and Engineering 49/2 (2011) 103-111.
• [20] PN-75/H-84024. Steel for elevated temperature applications. Grades.