Intergranular creep cracks have been observed in the heat affected zone of the 316H austenitic stainless steel superheater boiler tube bifurcation weldments after long term service at temperature of ∼550°C. The cracking mechanism is believed to be creep dominated. Moreover, chemical composition of defective material compared with similar uncracked components suggests that composition influences susceptibility to creep cracking. A systematic characterization of ratios number of creep cavities/grain boundary length and inter-granular precipitation length/grain boundary length has been undertaken in HAZ of three samples extracted from plants with different specific compositions. Here, the role of precipitation on creep deformation and fracture is explored. Precipitates of both ferrite and M23C6 carbide arising from long term service and associated creep cavitation have been identified using transmission electron microscopy. The creep damage and cracking, and therefore overall service life creep, is discussed by consideration of susceptibility of creep cavity nucleation and subsequently growth arising from specific differences in the chemical composition of the three boiler tube bifurcations.
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ASME 2016 Pressure Vessels and Piping Conference
July 17–21, 2016
Vancouver, British Columbia, Canada
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-5042-8
PROCEEDINGS PAPER
Role of Long Term Ageing on the Creep Life of Type 316H Austenitic Stainless Steel Bifurcation Weldments Available to Purchase
Ana I. Martinez-Ubeda,
Ana I. Martinez-Ubeda
University of Bristol, Bristol, UK
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Ian Griffiths,
Ian Griffiths
University of Bristol, Bristol, UK
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Oliver D. Payton,
Oliver D. Payton
University of Bristol, Bristol, UK
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Charles M. Younes,
Charles M. Younes
University of Bristol, Bristol, UK
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Tom B. Scott,
Tom B. Scott
University of Bristol, Bristol, UK
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Peter E. J. Flewitt
Peter E. J. Flewitt
University of Bristol, Bristol, UK
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Ana I. Martinez-Ubeda
University of Bristol, Bristol, UK
Ian Griffiths
University of Bristol, Bristol, UK
Oliver D. Payton
University of Bristol, Bristol, UK
Charles M. Younes
University of Bristol, Bristol, UK
Tom B. Scott
University of Bristol, Bristol, UK
Peter E. J. Flewitt
University of Bristol, Bristol, UK
Paper No:
PVP2016-63467, V06AT06A058; 7 pages
Published Online:
December 1, 2016
Citation
Martinez-Ubeda, AI, Griffiths, I, Payton, OD, Younes, CM, Scott, TB, & Flewitt, PEJ. "Role of Long Term Ageing on the Creep Life of Type 316H Austenitic Stainless Steel Bifurcation Weldments." Proceedings of the ASME 2016 Pressure Vessels and Piping Conference. Volume 6A: Materials and Fabrication. Vancouver, British Columbia, Canada. July 17–21, 2016. V06AT06A058. ASME. https://doi.org/10.1115/PVP2016-63467
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