|About this Abstract
||Materials Science & Technology 2019
||Late News Poster Session
||P3-78: Structure-property Correlation of Isothermal Friction Stir Welding of 304L SS
||Madhumanti Bhattacharyya, Arnab Kundu, Krishnan S Raja, Indrajit Charit, Saumyadeep Jana, Jens Darsell
|On-Site Speaker (Planned)
Friction stir welding (FSW) is being considered as a potential repair welding technique for spent nuclear fuels (SNF) dry storage canisters. In this study, an effort was made to explore the correlation between microstructure and mechanical properties in FSWed 304L stainless steel. FSW was performed at two different temperatures (725 and 825 °C) in order to repair simulated cracks introduced by electrical discharge machining in the hot rolled-annealed 304L plates. The tool rotation speed was adjusted so as to maintain constant temperature during welding. Optical microscopy and scanning electron microscopy revealed ultrafine grained (UFG) microstructure in the stir zone, which is attributed to dynamic recrystallization occurring during FSW. Vickers microhardness testing was performed across the weld zones. In both FSWed plates, a significant increase in hardness was noted at the stir zone compared to the parent material primarily due to the UFG microstructure.