TY - JOUR
T1 - TEM investigation of SCC crack tips in high Si stainless steel tapered specimens
AU - Penders, Aäron
AU - Konstantinovic, Milan
AU - Van Renterghem, Wouter
AU - Bosch, Rik-Wouter
AU - Schryvers, Dominique
N1 - Score=10
PY - 2021/2/14
Y1 - 2021/2/14
N2 - The stress corrosion cracking (SCC) mechanism is investigated in high Si duplex stainless steel in a simulated PWR environment based on TEM analysis of FIB-extracted SCC crack tips. The microstructural investigation in the near vicinity of SCC crack tips illustrates a strain-rate dependence in SCC mechanisms. Detailed analysis of the crack tip morphology, that includes crack tip oxidation and surrounding deformation field, indicates the existence of an interplay between corrosion- and deformation-driven failure as a function of the strain rate. Slow strain-rate crack tips exhibit a narrow cleavage failure which can be linked to the film-induced failure mechanism, while rounded shaped crack tips for faster strain rates could be related to the strain-induced failure. As a result, two nominal strain-rate-dependent failure regimes dominated either by corrosion or
deformation-driven cracking mechanisms can be distinguished.
AB - The stress corrosion cracking (SCC) mechanism is investigated in high Si duplex stainless steel in a simulated PWR environment based on TEM analysis of FIB-extracted SCC crack tips. The microstructural investigation in the near vicinity of SCC crack tips illustrates a strain-rate dependence in SCC mechanisms. Detailed analysis of the crack tip morphology, that includes crack tip oxidation and surrounding deformation field, indicates the existence of an interplay between corrosion- and deformation-driven failure as a function of the strain rate. Slow strain-rate crack tips exhibit a narrow cleavage failure which can be linked to the film-induced failure mechanism, while rounded shaped crack tips for faster strain rates could be related to the strain-induced failure. As a result, two nominal strain-rate-dependent failure regimes dominated either by corrosion or
deformation-driven cracking mechanisms can be distinguished.
KW - Stress corrosion cracking
KW - Stainless steel
KW - PWR
KW - TEM
KW - FIB
KW - Film-induced cleavage
UR - https://ecm.sckcen.be/OTCS/llisapi.dll/open/47481503
U2 - 10.1080/1478422X.2021.1961665
DO - 10.1080/1478422X.2021.1961665
M3 - Article
SN - 1478-422X
VL - 56
SP - 767
EP - 777
JO - Corrosion Engineering, Science and Technology
JF - Corrosion Engineering, Science and Technology
IS - 8
ER -