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Investigation of Hydrogen Behavior in Relation to the PWSCC Mechanism in Alloy TT690

  • Takumi TerachiEmail author
  • Takuyo Yamada
  • Nobuo Totsuka
  • Koji Arioka
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

The mechanism of primary water stress corrosion cracking (PWSCC) in Alloy TT690 was studied from the viewpoint of the influence of hydrogen behavior and cavity formation. Four parameters were examined: cavity formation at crack tips; deformation in the presence of hydrogen gas; dynamic strain effect on mechanical properties; and nickel plating effect on PWSCC propagation. The correlation that was observed between cavity formation at crack tips and crack growth rates indicates the cavities have an important influence on cracking. Results for creep tests done in the presence of hydrogen gas reveal hydrogen lowers the elasticity and makes the alloy brittle at the stress concentrated region. Results for slow strain rate tensile tests indicate that the dynamic strain which accompanies the hydrogen source increases the apparent yield strength. Additionally, nickel plating, which might change corrosion behavior on the alloy surface, suppresses the crack propagation. These observations provide direct support for hydrogen and cavity related mechanism that account for PWSCC of Alloy TT690.

Keywords

PWSCC Alloy TT690 Hydrogen Nickel plating HELP DSA 

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • Takumi Terachi
    • 1
    Email author
  • Takuyo Yamada
    • 1
  • Nobuo Totsuka
    • 1
  • Koji Arioka
    • 1
  1. 1.Institute of Nuclear Safety System Inc.Mikata-gunJapan

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