SEDL / STP / STP1125-EB / STP17899S

Irradiation-Induced Microchemical Effects and IASCC Initiation

Simonen, EP
Senior research scientist, senior technical specialist, and staff scientist, Pacific Northwest Laboratory, Richland, WA

Charlot, LA
Senior research scientist, senior technical specialist, and staff scientist, Pacific Northwest Laboratory, Richland, WA

Bruemmer, SM
Senior research scientist, senior technical specialist, and staff scientist, Pacific Northwest Laboratory, Richland, WA

Pages: 12    Published: Jan 1992

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Abstract

Predicted irradiation-induced enrichment of silicon and depletion of chromium at grain boundaries were consistent with measurements of ion-irradiated stainless steel grain boundary microchemistries. The calibrated solute drag mechanism for silicon enrichment and the inverse-Kirkendall mechanism for chromium depletion were then used to predict behaviors for neutron irradiation conditions relevant to irradiation-assisted stress corrosion cracking. A simple crack chemistry model illustrated how irradiation-induced chromium depletion might affect intergranular corrosion as a function of dose.