Abstract
Strain hardening and plastic instability properties were analyzed for EC316LN, HTUPS316, and AL6XN austenitic stainless steels after combined 800 MeV proton and spallation neutron irradiation to doses up to 10.7 dpa. The steels retained good strain-hardening rates after irradiation, which resulted in significant uniform strains. It was found that the instability stress, the stress at the onset of necking, had little dependence on the irradiation dose. Tensile fracture stress and strain were calculated from the stress-strain curve data and were used to estimate fracture toughness using an existing model. The doses to plastic instability and fracture, the accumulated doses at which the yield stress reaches instability stress or fracture stress, were predicted by extrapolation of the yield stress, instability stress, and fracture stress to higher dose. The EC316LN alloy required the highest doses for plastic instability and fracture. Plastic deformation mechanisms are discussed in relation to the strain-har dening properties of the austenitic stainless steels.
| Original language | English |
|---|---|
| Pages (from-to) | 269-279 |
| Number of pages | 11 |
| Journal | Journal of Nuclear Materials |
| Volume | 298 |
| Issue number | 3 |
| DOIs | |
| State | Published - Oct 2001 |
Funding
This work resulted from our participation in the LANL-APT materials irradiation experiment. Cooperation was initiated with Dr W. Sommer of LANL, who arranged for ORNL's participation. Dr S.A. Maloy of LANL coordinated the incorporation of the ORNL-SNS specimens and worked closely with us on the project. This research was sponsored by the Division of Materials Sciences and Engineering, Office of Basic Energy Sciences, US Department of Energy, under contract DE-AC05-00OR22725 with UT-Battelle, LLC.
| Funders | Funder number |
|---|---|
| U.S. Department of Energy | DE-AC05-00OR22725 |
| Basic Energy Sciences | |
| Division of Materials Sciences and Engineering |