The evaluation of suitability for operation of repair low-alloy steel welded joints

• Autorzy: Dziuba-Kałuża M. , Zieliński A. , Jasiński A. , Sroka M. , Dobrzański J. , Linek T.

Identyfikatory

DOI

10.5604/18972764.1226992

• Języki publikacji: EN

Abstrakty

EN

Purpose: The purpose of the work was to evaluate the material condition of repair welded joints of steam pipelines with regard to their suitability for operation including determination of the time of their further safe operation. Design/methodology/approach: The following was carried out: microstructure investigations using scanning electron microscopy, investigations on mechanical properties at room and elevated temperatures, determination of the fracture appearance transition temperature based on impact tests. The abridged creep tests without measurement of elongation during test were carried out to determine the material’s residual life. Findings: The time of safe operation was determined for welded joints made in 14MoV63 steel after long-term service and 14MoV63 steel after long-term service and in the as-received condition. Practical implications: The applied methodology and the adopted procedures are used in evaluating the condition and forecasting further operation of new repair welded joints for the pressure part components of power equipment working under creep conditions. Originality/value: The obtained results of investigations will be the elements of materials characteristics worked out by the Institute for Ferrous Metallurgy for the steels and welded joints made in them to work under creep conditions.

Słowa kluczowe

EN

structure; mechanical properties; degradation after creep service; residual life; steel 14MoV6-3; repair weld joint

PL

struktura; właściwości mechaniczne; degradacja na skutek pełzania; trwałość resztkowa; stal 14MoV6-3

• Wydawca: International OCSCO World Press
• Czasopismo: Archives of Materials Science and Engineering
• Rocznik: 2016
• Tom: Vol. 78, nr 2
• Strony: 78--86
• Opis fizyczny: Bibliogr. 14 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

Jasiński A.

• Energopomiar Gliwice, ul. Gen. J. Sowińskiego 3, 44-100 Gliwice, Poland

autor

Sroka M.

• Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland

autor

Dobrzański J.

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

autor

Linek T.

• 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 (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] A. Zieli ski, M. Dziuba-Kałuża, J. Dobrzański, M. Sroka, The impact of repair welded joint on the life of Cr-Mo-V steel steam pipeline after service under creep conditions, Archives of Materials Science and Engineering 68/1 (2014) 36-44.
• [5] M. Dziuba-Kałuża, J. Dobrzański, A. Zieli ski, 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. [
• 6] J. Dobrzański, A. Zieli ski, The assessment of suitability for further operation of the material of 14MoV63 (13HMF) steel primary steam pipeline elements after 200 000 h service under creep conditions, Thematic Booklet 18 (2008) 32-36.
• [7] 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.
• [8] 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 Institute for Ferrous Metallurgy 65/3 (2013) 64-66.
• [9] M. Dziuba-Kałuża, J. Dobrzański, 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.
• [10] 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.
• [11] A. Zieliński, J. Dobrzański, M. Sroka, Changes in the structure of VM12 steel after being exposed to creep conditions, Archives of Materials Science and Engineering 49/2 (2011) 103-111.
• [12] J. Dobrzański, M. Sroka, Computer aided classification of internal damages the chromiummolybdenum steels after creep service, Journal of Achievements in Materials and Manufacturing Engineering 24/2 (2007) 143-146.
• [13] A. Zieliński, J. Dobrzański, G. Golaski, M. Sroka, Computer-assisted analysis of changes in the microstructure of P92 steel after exposure at elevated temperatur, Archives of Materials Science and Engineering 65/2 (2014) 77-86.
• [14] A. Zieliński, G. Golaski, M. Sroka, J. Dobrzaski, Estimation of long-term creep strength in austenitic power plant steels, Materials Science and Technology 32/8 (2016) 780-785. 5. Summary References

Uwagi

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017)