SYMPOSIA PAPER Published: 09 February 2018
STP87019850006

Elasto-Plastic Fracture Mechanics Characterization of Type 316H Irradiated Stainless Steel up to 1 dpa

Source

The subject of this research concerns a vast irradiation program of the stainless steel material that is used extensively in Liquid Metal Fast Breeder Reactors (LMFBRs) irremoveable primary circuit components. Irradiations covering the 0.1, 0.3, 1, and 2 displacements per atom (dpa) neutron damage have been planned. The results presented concern the nought, 0.1, 0.3, and 1 dpa irradiations. Irradiation and tests are conducted at 350°C and 550°C on plane-sided three-point bend bars. The Type 316H stainless steel has been considered in the base condition, the welded deposits, and the heat-affected zone (HAZ) material. To study the stable crack extension with rising loads behavior of this steel, crack-growth resistance curves have been elaborated using key curves. Consistent crack-growth resistance curves are obtained in all cases. The results indicate a low degradation with increasing fluence for the weld material at both temperatures. The base material has given indications of strongly decreasing toughness at 0.1 dpa and at the 1 dpa fluences at 550°C with respect to the results at 0 and 0.3 dpa. No significant alterations have been found at 35O°C and at all fluences. The HAZ material was studied too, and it was found that all J values corresponding to various crack advances fell within the base material results at 350°C as upper bound and the weld material at 55O°C as lower bound at corresponding fluence levels.

Author Information

Bernard, Jean
Commission of the European Communities, Joint Research Centre—Ispra Establishment, Ispra, IT
Verzeletti, Guido
Commission of the European Communities, Joint Research Centre—Ispra Establishment, Ispra, IT
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Details
Developed by Committee: E10
Pages: 619–641
DOI: 10.1520/STP87019850006
ISBN-EB: 978-0-8031-7679-9
ISBN-13: 978-0-8031-0592-8