Abstract
Exposure of V-Cr-Ti alloys to low oxygen partial pressures at high temperature results in oxygen absorption and internal oxidation. Characterization of a V-Cr-4-Ti alloy after oxidation at 500°C revealed a microstructure with ultrafine oxide precipitates in the matrix and along grain boundaries. Heat treatment at 950°C following oxidation resulted in large TiOx precipitates in the matrix and grain boundaries. Tensile ductility was reduced by exposure to low-pressure oxygen under the temperature and pressure conditions. However, heat treatment at 950°C following oxidation was generally effective in recovering ductility irrespective of initial annealing treatment or grain size. Without increases in oxygen, >500 wppm hydrogen was required to cause significant decreases in tensile elongation. When oxygen was added either during or prior to hydrogen exposure, significant embrittlement occurred with 100 wppm hydrogen. Because of this synergism with hydrogen, oxygen pick-up remains a major concern for V-Cr-Ti alloys in fusion reactor applications.
| Original language | English |
|---|---|
| Pages (from-to) | 841-845 |
| Number of pages | 5 |
| Journal | Journal of Nuclear Materials |
| Volume | 283-287 |
| Issue number | PART II |
| DOIs | |
| State | Published - 2000 |
Funding
Research sponsored by the Office of Fusion Energy Sciences, US Department of Energy under contract DE-AC05-96OR22646 with Lockheed Martin Energy Research Corporation. The submitted manuscript has been authored by a contractor of the US Government under contract DE-AC05-96OR22464. Accordingly, the US Government retains a non-exclusive, royalty-free license to publish or reproduce the published form of this contribution, or allow others to do so, for US Government purposes.
| Funders | Funder number |
|---|---|
| Lockheed Martin Energy Research Corporation | |
| U.S. Department of Energy | DE-AC05-96OR22646 |
| Fusion Energy Sciences |
