Technetium Waste Form Development - Progress Report

Gelles, David S. ; Ermi, Ruby M. ; Buck, Edgar C. ; Seffens, Rob J. ; Chamberlin, Clyde E.

关键词: AR FACILITIES;    AUSTENITIC STEELS;    BUBBLES;    CAVITATION;    CAVITIES;    COATINGS;    ELECTRON MICROSCOPY;    EUTECTICS;    FERRITIC STEELS;    IDAHO;    PROGRESS REPORT;    TECHNETIUM;    WASTE FORMS Technetium;    Analytical Electron Microscopy;    GNEP;    Characterization;    Wasteforms;   

DOI  :  10.2172/967002
RP-ID  :  PNNL-18055
PID  :  OSTI ID: 967002
Others  :  Other: AF5805100
Others  :  TRN: US0904252

美国|英语

来源: SciTech Connect

【 摘 要 】

Analytical electron microscopy using SEM and TEM has been used to analyze a ~5 g. ingot with composition 71.3 wt% 316SS-5.3 wt% Zr-13.2 wt% Mo-4.0 wt% Rh-6.2 wt% Re prepared at the Idaho National Laboratory. Four phase fields have been identified two of which are lamellar eutectics, with a fifth possibly present. A Zr rich phase was found distributed as fine precipitate, ~10Âľm in diameter, often coating large cavities. A Mo-Fe-Re-Cr lamellar eutectic phase field appears as blocky regions ~30Âľm in diameter, surrounded by a Fe-Mo-Cr lamellar eutectic phase field, and that in turn is surrounded by a Zr-Fe-Rh-Mo-Ni phase field. The eutectic phase separation reactions are different. The Mo-Fe-Re-Cr lamellar eutectic appears a result of austenitic steel forming at lower volume fraction within an Mo-Fe-Re intermetallic phase, whereas the Fe-Mo-Cr lamellar eutectic may be a result of the same intermetallic phase forming within a ferritic steel phase. Cavitation may have arisen either as a result of bubbles, or from loss of equiaxed particles during specimen preparation.