|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Materials and Fuels for the Current and Advanced Nuclear Reactors V
||AA-11: Low Temperature Friction Stir Welding (FSW) of Cr-Mo Steels
||Prasad Rao Kalvala, Javed Akram, R Damodaram, Mano Misra
|On-Site Speaker (Planned)
High chromium (9-12%Cr) steels have been widely used for thermal power plant applications and are candidate materials for nuclear applications in view of their excellent creep strength. However, the weld counterparts are found to exhibit lower life than the designed life of the base metal. Degradation of martensite lath subgrains into equiaxed subgrains is regarded as one of the major factors in reducing the creep strength of the fine-grain-heat-affected-zone (FGHAZ). This is attributed to the high temperature excursion of the FGHAZ region above Ac1/ Ac3 during welding. In this study it is proposed to control the temperature in the weld metal below Ac1, so that the HAZ will not experience temperatures above Ac1 (857 °C). Using FSW, it is possible to control the peak temperature below Ac1 in the stir zone by controlling the weld parameters. With this low heat input approach, 9-12%Cr steel welds without a FGHAZ was created.
||Planned: A print-only volume