TY - GEN
T1 - The role of localized deformation in IASCC of proton-irradiated austenitic stainless steels
AU - Jiao, Z.
AU - Was, G. S.
AU - Busby, J. T.
PY - 2007
Y1 - 2007
N2 - Localized deformation is a possible factor contributing to irradiation-assisted stress corrosion cracking (IASCC) of austenitic stainless steels and it may be affected by stacking fault energy (SFE). In order to achieve a better understanding of the underlying IASCC mechanism, the role of localized deformation was examined in six austenitic alloys with various SFEs. Alloys selected in this study include a commercial purity alloy CP-304, a high purity alloy HP-304 with Si addition and other four high purity alloys, Fe-15Cr-12Ni, Fe-18Cr-12Ni, Fe-25Cr-25Ni and Fe-21Cr-32Ni. Irradiations were performed using 3.2 MeV protons to a dose of ∼5 dpa at 360°C. Constant extension rate tensile tests were conducted in argon and simulated BWR and/or PWR environment to examine localized deformation and IASCC susceptibility. Results show that IASCC susceptibility is greatest in the alloys with low stacking fault energy. SCC in CP-304 can be related to the fracture of MnS inclusions at grain boundaries caused by localized deformation. Silicon may affect localized deformation by lowering SFE and promoting precipitates. Alloys tested under both BWR and PWR conditions suggest that the role of localized deformation may be enhanced or weakened by the environment.
AB - Localized deformation is a possible factor contributing to irradiation-assisted stress corrosion cracking (IASCC) of austenitic stainless steels and it may be affected by stacking fault energy (SFE). In order to achieve a better understanding of the underlying IASCC mechanism, the role of localized deformation was examined in six austenitic alloys with various SFEs. Alloys selected in this study include a commercial purity alloy CP-304, a high purity alloy HP-304 with Si addition and other four high purity alloys, Fe-15Cr-12Ni, Fe-18Cr-12Ni, Fe-25Cr-25Ni and Fe-21Cr-32Ni. Irradiations were performed using 3.2 MeV protons to a dose of ∼5 dpa at 360°C. Constant extension rate tensile tests were conducted in argon and simulated BWR and/or PWR environment to examine localized deformation and IASCC susceptibility. Results show that IASCC susceptibility is greatest in the alloys with low stacking fault energy. SCC in CP-304 can be related to the fracture of MnS inclusions at grain boundaries caused by localized deformation. Silicon may affect localized deformation by lowering SFE and promoting precipitates. Alloys tested under both BWR and PWR conditions suggest that the role of localized deformation may be enhanced or weakened by the environment.
UR - http://www.scopus.com/inward/record.url?scp=51649112756&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:51649112756
SN - 9781605600598
SN - 9781605600598
T3 - Canadian Nuclear Society - 13th International Conference on Environmental Degradation of Materials in Nuclear Power Systems 2007
SP - 529
EP - 539
BT - Canadian Nuclear Society - 13th International Conference on Environmental Degradation of Materials in Nuclear Power Systems 2007
T2 - 13th International Conference on Environmental Degradation of Materials in Nuclear Power Systems 2007
Y2 - 19 April 2007 through 23 April 2007
ER -