SEDL / STP / STP782-EB / STP34342S

Analysis of the High Fluence Creep Behavior of Two Precipitation Strengthened Alloys

Chin, BA
Associate Professor, Auburn University, Auburn, AL

Puigh, RJ
Senior Scientist, Hanford Engineering Development Laboratory, Richland, WA

Pages: 14    Published: Jan 1982

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Abstract

The results of pressurized tube experiments designed to investigate the creep behavior of two precipitation hardened alloys (M813 and PE16) of the Fe-Cr-Ni system are presented. Data are reported covering temperatures from 400°C to 750°C, for accumulated fluences to 16 × 10²² n/cm², E > 0.1 MeV. This corresponds to five years of testing in EBR-II. Both alloys show greater swelling and creep resistance than 316 CW. A peak in the creep temperature dependence of M813 and PE16 was found that corresponds to the peak swelling temperature. The in-reactor creep resistance is rapidly lost for irradiation temperatures greater than 675°C in both alloys. The results support micromechanisms of irradiation creep which are theoretically linked to the swelling phenomena.