|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Materials and Fuels for the Current and Advanced Nuclear Reactors V
||Laser Shock Peening of Oxide-Dispersion-Strengthened Austenitic Stainless Steels
||Bai Cui, Qiaofeng Lu, Chenfei Zhang, Dawei Li, Yongfeng Lu, Qing Su, Michael Nastasi
|On-Site Speaker (Planned)
Oxide-dispersion-strengthened (ODS) steels are promising materials for Generation-IV nuclear systems because of their outstanding resistance to creep and irradiation damage. However, ODS austenitic steels are susceptible to stress corrosion cracking (SCC) in primary and supercritical water environments. The objective of this research is to mitigate the SCC of ODS austenitic steels by laser shock peening (LSP). Two major outcomes result from LSP: (1) significant compressive residual stresses (0.1-1 GPa); (2) severe plastic deformation and microstructural changes such as an increased density of deformation twins and dislocations. The microstructural evolution in the LSP of ODS austenitic steels will be studied using transmission electron microscopy (TEM). The mechanisms accounting for the retardation of crack initiation and propagation will be determined from the focused-ion beam (FIB)/TEM investigation of the specimens after the SCC test. Particular attention will be given to the interactions of laser-driven shock waves with oxide nanoparticles in ODS steels.
||Planned: A print-only volume