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Oxidation and SCC Initiation Studies of Type 304L SS in PWR Primary Water

  • F. SceniniEmail author
  • J. Lindsay
  • Litao Chang
  • Y. L. Wang
  • M. G. Burke
  • S. Lozano-Perez
  • G. Pimentel
  • D. Tice
  • K. Mottershead
  • V. Addepalli
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

Slow strain rate tensile (SSRT) tests were conducted on conventional and tapered samples manufactured from forged Type 304L stainless steel to assess the stress corrosion cracking (SCC) behaviour in simulated PWR primary water. Several testing and microstructural parameters were investigated in order to explore the conditions under which crack initiation might occur. Surface preparation appeared to play a very important role on SCC initiation whereby the machined surfaces were the least susceptible to SCC initiation whilst oxide polishing suspension (OPS) polished surfaces were more susceptible. On the machined surfaces the cracks were always transgranular (TG) in nature and associated with the machining marks. Conversely, on fine polished surfaces with oxide polishing suspension the crack morphology was mainly intergranular in nature, although minor transgranular cracking was observed. The regions in the proximity of the δ-ferrite/austenite interface were shown to be very susceptible to SCC initiation especially on the OPS polished surfaces and this was attributed to the strain localization upon dynamic deformation. Furthermore, intragranular inclusions appeared to dissolve and act as initiation sites for transgranular cracking to occur. The roles of strain rate, dynamic deformation and microstructure on the initiation of SCC are also discussed.

Keywords

Oxidation Stress corrosion cracking (SCC) initiation Slow strain rate test (SSRT) 304L stainless steel 

Notes

Acknowledgements

The authors would like to acknowledge the financial support of the New Nuclear Manufacturing (NNUMAN) program sponsored by EPSRC (grant EP/JO21172/1), Dr. Agostino Maurotto of the Nuclear Advanced Manufacturing Research Centre (University of Sheffield) for providing the machined plates.

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • F. Scenini
    • 1
    Email author
  • J. Lindsay
    • 1
  • Litao Chang
    • 1
  • Y. L. Wang
    • 1
  • M. G. Burke
    • 1
  • S. Lozano-Perez
    • 2
  • G. Pimentel
    • 2
  • D. Tice
    • 3
  • K. Mottershead
    • 3
  • V. Addepalli
    • 3
  1. 1.Material Performance CentreUniversity of ManchesterManchesterUK
  2. 2.Department of MaterialsUniversity of OxfordOxfordUK
  3. 3.AMEC Foster WheelerCheshireUK

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