Intergranular Segregation in the Pressure Vessel Steel of a Commercial Nuclear Reactor Studied by Atom Probe Tomography

• Toyama Takeshi

  International Research Center for Nuclear Materials Science, Institute for Materials Research, Tohoku University

• Nagai Yasuyoshi

  International Research Center for Nuclear Materials Science, Institute for Materials Research, Tohoku University

• Al Mazouzi Abderrahim

  SCK-CEN, Nuclear Materials Science Institute

• Hatakeyama Masahiko

  International Research Center for Nuclear Materials Science, Institute for Materials Research, Tohoku University

• Hasegawa Masayuki

  International Research Center for Nuclear Materials Science, Institute for Materials Research, Tohoku University

• Ohkubo Tadakatsu

  National Institute for Materials Science

• Van Walle Eric

  SCK-CEN, Nuclear Materials Science Institute

• Gerard Robert

  Tractebel Engineering

抄録

Solute/impurity segregation and precipitation at grain boundaries (GBs) in a nuclear reactor pressure vessel (RPV) steel were investigated using laser-assisted atom probe tomography (APT): RPV surveillance test specimens irradiated in a commercial nuclear reactor to neutron doses of 0.83 × 10¹⁹ n·cm⁻² (low-dose) and 5.1 × 10¹⁹ n·cm⁻² (high-dose), corresponding to in-service exposure of ∼5 and ∼30 years, respectively. The segregation of C, P and Mo was found on GBs after the low-dose irradiation. The segregation of Si and Mn as well as C, P and Mo was observed after the high-dose irradiation. The monolayer coverage of P is estimated to be less than a suggested level for intergranular embrittlement. The segregation of C, P and Mo was also observed along parallel array of dislocation lines in small-angle grain boundaries. However, no segregation of Si and Mn was detected there. Copper-nano precipitates (CNPs) were observed on the GBs, along the dislocation lines and in the matrix. The sizes and the solute-impurity enrichment in these CNPs are compared.

収録刊行物

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 54 (11), 2119-2124, 2013

  公益社団法人 日本金属学会

キーワード

• grain boundary segregation
• atom probe tomography
• reactor pressure vessel steel
• irradiation effect

詳細情報

• CRID: 1390282679226108544
• NII論文ID: 130004824987
• NII書誌ID: AA1151294X
• DOI: 10.2320/matertrans.m2013133
• COI: 1:CAS:528:DC%2BC2cXhvFaiug%3D%3D
• ISSN: 13475320
• ISSN: 13459678
• NDL書誌ID: 024968808
• Web Site: http://id.ndl.go.jp/bib/024968808
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I024968808
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/54/11/54_M2013133/_pdf
• 本文言語コード: en
• データソース種別:
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  • NDL
  • Crossref
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  • KAKEN
• 抄録ライセンスフラグ: 使用不可