Stress corrosion cracking of stainless steel pipe weldments in BWR environment: A system safety benchmark facility for evaluation of crack growth rates under different flow rate conditions

Y. Lu, K. Sakaguchi, T. Shoji

Research output: Contribution to journalConference article

Abstract

A System Safety Benchmark Facility (SSBF) was designed and constructed for assessing the crack growth behaviour of welded pipes. Using the SSBF, the effect of flow rate on the SCC susceptibility of 304, 304L and 316L stainless steels was investigated in high temperature water with 2ppm dissolved oxygen. As a result, at a flow rate of 5.5cm/sec a penetrating crack was found at the Heat Affected Zone (HAZ) of type 304 steel next to the weld metal 182 alloy after 1030 hrs of testing. The maximum crack growth rate was about 6×10 -7 mm·s-1. Additionally, the oxide film formed on the inside surface of specimen was examined by Scanning Electron Microscope (SEM), Raman spectroscopy and Electron Spectroscopy for Chemical Analysis (ESCA). A Focus Ion Beam (FIB) technique was used to measure the thickness of the film. The results showed that the composition, morphology, and thickness of the oxide film depends on the flow rate, the types of material, and the existence of HAZ. The implications of the characteristics of the oxide film to SCC susceptibility are discussed.

Original languageEnglish
Pages (from-to)1017-1022
Number of pages6
JournalKey Engineering Materials
Volume261-263
Issue numberII
Publication statusPublished - 2004
EventAdvances in Fracture and Failure Prevention: Proceedings of the Fifth International Conference on Fracture and Strength of Solids (FEOFS2003): Second International Conference on Physics and Chemistry of Fracture and Failure Prevention (2nd ICPCF) - Sendai, Japan
Duration: 2003 Oct 202003 Oct 22

Keywords

  • 182 Alloy
  • 304
  • 304L
  • 316L
  • BWR
  • Pipe Weldments
  • Stress Corrosion Cracking (SCC)
  • System Safety Benchmark Facility (SSBF)

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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