Life Assessment for Cr-Mo Steel Dissimilar Joints by Various Filler Metals Using Accelerated Creep Testing
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Publication Details
Author list: Petchsang S., Phung-on I., Poopat B.
Publisher: Springer
Publication year: 2016
Journal: Journal of Materials Engineering and Performance (1059-9495)
Volume number: 25
Issue number: 12
Start page: 5424
End page: 5439
Number of pages: 16
ISSN: 1059-9495
eISSN: 1544-1024
Languages: English-Great Britain (EN-GB)
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Abstract
Accelerated creep rupture tests were performed on T22/T91 dissimilar metal joints to determine the fracture location and rupture time of different weldments. Four configurations of deposited filler metal were tested using gas tungsten arc welding to estimate the service life for Cr-Mo steel dissimilar joints at elevated temperatures in power plants. Results indicated that failure in all configurations occurred in the tempered original microstructure and tempered austenite transformation products (martensite or bainite structure) as type IV cracking at the intercritical area of the heat-affected zone (ICHAZ) for both T22 and T91 sides rather than as a consequence of the different filler metals. Creep damage occurred with the formation of precipitations and microvoids. The correlation between applied stress and the Larson-Miller parameter (PLM) was determined to predict the service life of each material configuration. Calculated time-to-failure based on the PLM and test results for both temperature and applied stress parameters gave a reasonable fit. The dissimilar joints exhibited lower creep rupture compared to the base material indicating creep degradation of the weldment. ฉ 2016, ASM International.
Keywords
creep degradation, creep rupture test, fracture location, ICHAZ, Larson-Miller parameter (PLM), rupture time, type IV cracking
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