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Hydrogen-Assisted Subcritical Crack Growth Rate in Cr-Mo Steels

[+] Author Affiliations
Shinji Konosu

Ibaraki University, Hitachi, Ibaraki, Japan

Ryuji Uemori

Nippon Steel & Sumitomo Metal Corporation, Futtsu, Chiba, Japan

Masao Yuga

JFE Steel Corporation, Handa, Aichi, Japan

Hiroshi Yamamoto

Chiyoda Corporation, Yokohama, Japan

Paper No. PVP2014-28720, pp. V06BT06A022; 12 pages
doi:10.1115/PVP2014-28720
From:
  • ASME 2014 Pressure Vessels and Piping Conference
  • Volume 6B: Materials and Fabrication
  • Anaheim, California, USA, July 20–24, 2014
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-4604-9
  • Copyright © 2014 by ASME

abstract

Hydrogen substantially reduces fracture properties such as threshold stress intensity factor KIH and tearing resistance dJ/da in conventional Cr-Mo steels. In order to enable the life assessment of a reactor with a hydrogen-induced crack using a failure assessment diagram (FAD), an experimental database of hydrogen-assisted subcritical crack growth rates da/dt is requisite. However, there are very few studies concerning the effects of hydrogen- and temper-embrittlement on da/dt at ambient temperatures in 2.25Cr-1Mo steels with high and low impurity levels. In this paper, vacuum melted lab heats of 2.25Cr-1Mo steel were supplied with compositional controls. Some specimens were embrittled by step cooling heat treatment (SCHT). Subcritical crack growth rate at a constant load was obtained by means of the potential drop method for 2.25Cr-1Mo steel with initial internal hydrogen (3.2 mass ppm).

Copyright © 2014 by ASME

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