|About this Abstract
||Materials Science & Technology 2019
||Materials for Nuclear Applications
||The Effects of Ultrasonic Nanocrystal Surface Modification at Room Temperature and Elevated Temperatures on Residual Stress, Microstructure and Mechanical Properties of Nuclear Alloys IN600 and IN690.
||Harsha Venkat S Naralasetty, Auezhan Amanov, Young Sik Pyoun, Jie Song, Nicholas Mohr, Seetha R. Mannava, Vijay K. Vasudevan
|On-Site Speaker (Planned)
||Harsha Venkat S Naralasetty
Nuclear Alloys IN600 (Ni-15Cr-9Fe) and IN690 (Ni-30Cr-9Fe) are widely used in several light water reactor components. These alloys are susceptible to stress corrosion cracking (SCC) failure under certain material conditions that could be mitigated by advanced mechanical surface treatments. In this study, the specimens of these nuclear alloys were subjected to a severe surface plastic deformation surface treatment technique called as the Ultrasonic Nanocrystal Surface Modification (UNSM) at room and elevated temperatures. The changes in local mechanical properties and the near-surface and through-the-depth residual stress and microstructure with respect to temperature were studied using nanoindentation, XRD and EBSD, respectively. Due to the heavy amount of plastic strain induced in the specimens by UNSM, a high magnitude of near-surface compressive residual stresses, nanostructures and appreciable hardening were observed in both the alloys, which together have beneficial effects in improving the resistance to SCC. These results will be presented and discussed.