Influence of neutron irradiation on hardening and embrittlement phenomena in reactor pressure vessel cladding material

J. S. Lee, I. S. Kim, R. Kasada, A. Kimura

Research output: Contribution to journalConference articlepeer-review

Abstract

SA508 cl.3 reactor pressure vessel steel plates were overlay cladded with type ER309L welding consumables by submerged arc welding. The microstructure of the clad was composed of fee austenite, a few percent of bcc δ-ferrite and brittle σ phase. The irradiation-induced hardening and its related mechanical property changes of the clad were investigated using tensile, small punch (SP) and electrical resistivity measurements. Neutron fluences of irradiated specimens at 290 °C were ranged from ∼5 × 1018 to ∼5 × 1019 n/cm2 (>1MeV). Not only yield stress but electrical resistivity were increased with irradiation and the δ-ferrite showed an approximately 1.5 times higher hardening than the austenite matrix. The general hardening may come from the irradiation-produced fine size defect clusters in the austenite matrix. The SP ductile/brittle transition temperature (SP-DBTT) moved to higher temperature with irradiation, and the SP-DBTT was substantially influenced by the amount of brittle CT phase.

Original languageEnglish
Pages (from-to)4477-4482
Number of pages6
JournalMaterials Science Forum
Volume426-432
Issue number5
DOIs
Publication statusPublished - 2003
Externally publishedYes
EventThermec 2003 Processing and Manufacturing of Advanced Materials - Madrid, Spain
Duration: 2003 Jul 72003 Jul 11

Keywords

  • Irradiation hardening
  • RPV clad
  • SP-DBTT
  • δ-ferrite
  • σ phase

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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