The evaluation of suitability for operation of low-alloy Cr-Mo and Cr-Mo-V steel welded joints beyond the design work time

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

Abstrakty

EN

Purpose: The purpose of this paper was to develop material characteristics for homogeneous circumferential welded joints in low-alloy steel steam pipelines of power units after long-term service beyond the design work time. Design/methodology/approach: The investigations of microstructure using scanning microscopy, investigations of mechanical properties at room and elevated temperature, in particular the static tensile test, determination of brittle fracture appearance transition temperature based on the impact strength tests and abridged creep tests without measurement of elongation during test were carried out in order to determine the residual life of the material. Findings: The influence of long-term service on mechanical properties and structure of 13CrMo4-5 and 14MoV6-3 steel circumferential welded joints after long-term service under creep conditions beyond the design work time was determined. Practical implications: The applied methodology and adopted procedures will be used for evaluation of condition and prediction about further operation of welded joints of elements in the pressure part of power equipment working under creep conditions. Originality/value: The obtained results of investigations will be 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

14MoV6-3 steel; 13CrMo4-5 steel; mechanical properties; structure; creep; degradation; residual life

PL

stal 14MoV6-3; stal 13CrMo4-5; właściwości mechaniczne; struktura; pełzanie; degradacja; trwałość resztkowa

• Wydawca: International OCSCO World Press
• Czasopismo: Archives of Materials Science and Engineering
• Rocznik: 2014
• Tom: Vol. 66, nr 1
• Strony: 21--30
• Opis fizyczny: Bibliogr. 16 poz.

Twórcy

autor

Dziuba-Kałuża M.

• 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

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, 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.
• [3] A. Hernas, Materials and technologies for construction of supercritical boilers and waste incinerators, Joint Publication edited by A. Hernas, Katowice 2009, 9.
• [4] 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, IMiUE Works 23/1 (2009) 85-126.
• [5] 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.
• [6] 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.
• [7] 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.
• [8] 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.
• [9] 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.
• [10] 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, IMŻ Works 65/3 (2013) 64-66.
• [11] 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.
• [12] 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.
• [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] J. Dobrzański, A. Zieliński, M. Sroka, Structure, properties and method of the state evaluation of lowalloyed steel T23 (HCM2S) worked in creep conditions, Proceedings of the 11th International Scientific Conference “Contemporary Achievements in Mechanics, Manufacturing and Materials Science” CAM3S’2005, Gliwice-Zakopane, 2005, 4-7.
• [15] 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.
• [16] M. Dziuba-Kałuża, J. Dobrzański. A. Zieliński, Mechanical properties of Cr-Mo and Cr-Mo-V lowalloy steel welded joints after long-term service under creep conditions, Archives of Materials Science and Engineering 63/1 (2013) 5-12.