| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior of Nuclear Reactor Components
|
| Presentation Title |
Challenges to Accurate Evaluation of Bulk Hardness with Nanoindentation Testing at Low Indent Depths |
| Author(s) |
Pengcheng Zhu, Yajie Zhao, Shradha Agarwal, Steven Zinkle |
| On-Site Speaker (Planned) |
Pengcheng Zhu |
| Abstract Scope |
Ferritic/martensitic steels are promising structural materials for Generation IV fission and fusion reactors. High purity Fe and Fe-(3-25%)Cr in annealed and aged (100-900 hours at 475 °C) conditions were tested using nanoindentation to estimate the bulk hardness in nanoscale volumes. The effect of different test modes (constant strain rate, constant loading rate), surface preparation, and pileup corrections were evaluated; in all cases curvatures of Nix-Gao linear fitting model occurred below ~250 nm indent depths. Pile-up corrections by AFM improve the accuracy of the data and provide better correlation between nanoindentation and Vickers hardness. TEM and APT characterization of Cr-rich α’ precipitates was used to compare predicted (dispersed barrier hardening superposition) vs. measured strength values of the aged specimens. The nanoindentation responses of dual ion irradiated T91 (9MeV Fe<sup>3+</sup> and 3.42MeV He<sup>2+</sup>, 16.6 dpa at 445 and 500 °C) will be analyzed using optimized test protocol based on aged specimen testing. |
| Proceedings Inclusion? |
Planned: |