The role of prior fabrication and in service thermal ageing on the creep life of AISI Type 316 stainless steel components

A. I. Martinez Ubeda, Xander Warren, I. Griffiths, P. E. J. Flewitt

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

3 Citations (Scopus)
262 Downloads (Pure)

Abstract

A significant factor in creep life of AISI Type 316H austenitic stainless steel components such as headers, and tubes is the initial microstructure. These components typically have a comparable specified composition but different thermo-mechanical fabrication histories. The variations in composition within the nominal range result in initial microstructures which become increasingly divergent during ageing. In this paper we explore effect of these contributions on the long term service aged microstructure and discuss the resulting impacts on the overall creep life of these components. The microstructure of specific regions has been characterised with a range of techniques, including high resolution transmission electron microscopy imaging and chemical analyses undertaken using a JEOL ARM instrument operating at 200 KeV fitted with an energy dispersive spectrometer. This provides a unique identification of the service aged precipitates and the distribution of alloying and impurity elements. The results are discussed with respect to the initiation of creep cavities and the associated creep damage accumulation in the context of lifetime assessment of these AISI Type 316H austenitic stainless steel boiler components.
Original languageEnglish
Title of host publicationAdvances in Fracture and Damage Mechanics XV
Subtitle of host publicationSelected, peer reviewed papers from the 15th International Conference on Fracture and Damage Mechanics, September 14-16, 2016, Alicante, Spain
EditorsJesús Toribio, Vladislav Mantič, Andrés Sáez, M H Ferri Aliabadi
PublisherTrans Tech Publications Inc
Pages1-4
Number of pages4
DOIs
Publication statusPublished - 30 Sep 2016

Publication series

NameKey Engineering Materials
PublisherScientific.Net
Volume713
ISSN (Print)1013-9826
ISSN (Electronic)1662-9795

Keywords

  • Austenitic Stainless Steel
  • Chi Phase
  • Creep
  • M23C6 Carbide
  • Phosphorus Segregation

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