| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior of Nuclear Reactor Materials and Components IV
|
| Presentation Title |
Evaluation of Irradiation-Induced Hardening in Ferritic/Martensitic Steels and Hardness Correction Using Pile-Up Measurements |
| Author(s) |
Kook Noh Yoon, Christopher Richard Reis, Mehdi Balooch, Takuya Yamamoto, George Robert Odette, Peter Hosemann |
| On-Site Speaker (Planned) |
Kook Noh Yoon |
| Abstract Scope |
This study measured the hardening behavior of three F/M steels under Fe ion irradiation using nano-indentation (NI). Traditional direct nano-indentation (D-NI) on irradiated surface often results in data interpretation errors. To enhance accuracy, we developed cross-sectional nano-indentation (CS-NI), which provided more precise hardness (H) data. This technique allowed us to measure irradiation-induced hardening of 0.5-1 GPa even at low damage levels (3.5 dpa), previously hard to be measured with D-NI. Furthermore, we proposed a method to correct data distortions caused by pile-up effects. By accurately measuring the pile-up height around indent marks with AFM, we corrected the H values with high reliability. We also found that irradiation suppresses pile-up phenomena, likely due to restricted dislocation glide from irradiation damage. This was evidenced by TEM analysis, revealing dislocation channeling through slip bands, which are formed under peak irrigation depth (6 µm) of HT-9 steel. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Mechanical Properties, Iron and Steel |