About this Abstract |
| Meeting |
TMS Specialty Congress 2026
|
| Symposium
|
Energy Materials 2026
|
| Presentation Title |
Enhancement of Pitting Corrosion Resistance in Dry Storage Canisters for Spent Nuclear Fuel Using Laser Surface Processing |
| Author(s) |
Yongfeng Lu, Qiuchi Zhu, Lanh Trinh , Yongchul Yoo , Xin Chen , Aofei Mao, Xi Huang , Sven Bader, Muhammet Ayanoglu, Jean-Francois Silvain , Bai Cui |
| On-Site Speaker (Planned) |
Yongfeng Lu |
| Abstract Scope |
Stainless steel weld heat-affected zones (HAZs) face significant pitting corrosion risks in chloride-rich offshore environments, such as those encountered in dry storage canisters for spent nuclear fuel. Nanosecond pulsed laser surface melting (LSM) markedly improves pitting resistance in these HAZs by inducing grain refinement and enhanced chromium diffusion. Ultrafast cooling and resolidification during ns-pulsed LSM produce a uniform submicron-grained layer in HAZs, extending the previously established grain-refinement mechanism to weld-affected regions. This refined microstructure promotes chromium diffusion to the surface, resulting in a denser, chromium-oxide-rich passive film. Corrosion testing demonstrates that LSM-treated HAZs exhibit over 50% smaller pit sizes and nearly double the pitting potential compared to untreated samples. Although weld metal regions retain dendritic structures post-LSM and show limited improvement, the substantial gains in HAZ corrosion performance highlight critical roles of grain refinement and validate ns-pulsed LSM as an effective method for enhancing SS durability in aggressive chloride environments. |
| Proceedings Inclusion? |
Undecided |