Abstract
Tensile properties of four ferritic/martensitic steels, 9Cr-1MoVNb, 9Cr-1MoVNb-2Ni, 9Cr-2WV, and 9Cr-2WVTa, and two bainitic steels, 3Cr-3WV and A533B, were measured after irradiation to doses up to 1.2 dpa at temperatures in the range 60-100 °C in the High Flux Isotope Reactor and compared with two ferritic/martensitic (F/M) steels irradiated with 800 MeV protons and spallation neutrons in the LANSCE facility at 60-164 °C. Irradiation hardening in the steels was strong, and all of them displayed plastic instability shortly after yield for irradiations of 0.054 dpa and higher. Despite large loses in elongation, all failures occurred in a ductile manner. The dose dependencies of the increases in the yield strength with dpa were similar for all six steels, and contained a pronounced change at about 0.05 dpa. Below 0.05 dpa, the hardening exponent was 0.5-0.6, consistent with a barrier hardening mechanism. Above 0.05 dpa, the exponent was reduced to 0.1-0.2, which is speculated to be due to intervention by dislocation channeling. A trend curve for correlating changes in yield strengths of F/M steels with dose at irradiation temperatures below 160 °C is offered.
| Original language | English |
|---|---|
| Pages (from-to) | 274-282 |
| Number of pages | 9 |
| Journal | Journal of Nuclear Materials |
| Volume | 318 |
| Issue number | SUPPL |
| DOIs | |
| State | Published - May 15 2003 |
| Event | Fifth international workshop on spallation materials technology - Charleston, United States Duration: May 19 2002 → May 24 2002 |
Funding
This research was sponsored by the Spallation Neutron Source Project, Office of Science, US Department of Energy, under contract DE-AC05-00OR22725 with UT-Battelle, LLC. We are indebted to Drs S.A. Maloy and W.F. Sommer of Los Alamos National Laboratory for their cooperation with the LANSCE irradiations.
| Funders | Funder number |
|---|---|
| Spallation Neutron Source Project | |
| U.S. Department of Energy | DE-AC05-00OR22725 |
| Office of Science |