TY - GEN
T1 - Hydrogen-assisted subcritical crack growth rate in CR-MO steels
AU - Konosu, Shinji
AU - Uemori, Ryuji
AU - Yuga, Masao
AU - Yamamoto, Hiroshi
N1 - Publisher Copyright:
Copyright © 2014 by ASME.
Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2014
Y1 - 2014
N2 - 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).
AB - 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).
UR - http://www.scopus.com/inward/record.url?scp=84911957231&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84911957231&partnerID=8YFLogxK
U2 - 10.1115/PVP2014-28720
DO - 10.1115/PVP2014-28720
M3 - Conference contribution
AN - SCOPUS:84911957231
T3 - American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
BT - Materials and Fabrication
PB - American Society of Mechanical Engineers (ASME)
T2 - ASME 2014 Pressure Vessels and Piping Conference, PVP 2014
Y2 - 20 July 2014 through 24 July 2014
ER -