Radiation-induced grain boundary segregation in austenitic stainless steels
Radiation-induced segregation (RIS) to grain boundaries in Fe-Ni-Cr-Si stainless alloys has been measured as a function of irradiation temperature and dose. Heavy-ion irradiation was used to produce damage levels from 1 to 20 displacements per atom (dpa) at temperatures from 175 to 550{degrees}C. Measured Fe, Ni, and Cr segregation increased sharply with irradiation dose (from G to 5 dpa) and temperature (from 175 to about 350{degrees}C). However, grain boundary concentrations did not change significantly as dose or temperatures were further increased. Although interfacial compositions were similar, the width of radiation-induced enrichment or depletion profiles increased consistently with increasing dose or temperature. Impurity segregation (Si and P) was also measured, but only Si enrichment appeared to be radiation-induced. Grain boundary Si peaked at levels approaching 10 at% after irradiation doses to 10 dpa at an intermediate temperature of 325{degrees}C. No evidence of grain boundary silicide precipitation was detected after irradiation at any temperature. Equilibrium segregation of P was measured in the high-P alloys, but interfacial concentration did not increase with irradiation exposure. Comparisons to reported RIS in neutron-irradiated stainless steels revealed similar grain boundary compositional changes for both major alloying and impurity elements.
- Research Organization:
- Pacific Northwest Lab., Richland, WA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 10116221
- Report Number(s):
- PNL-SA--25507; CONF-941144--51; ON: DE95005721
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360106
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600
ANISOTROPY
AUSTENITIC STEELS
GRAIN BOUNDARIES
IMPURITIES
INTERFERING ELEMENTS
INTERSTITIALS
KIRKENDALL EFFECT
MICROSTRUCTURE
ORE ENRICHMENT
PHYSICAL RADIATION EFFECTS
RADIATION CHEMISTRY
RADIATION EFFECTS
SEGREGATION
SPUTTERING
STAINLESS STEELS
TRANSMISSION ELECTRON MICROSCOPY