|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Advanced High Strength Steels V
||Effects of V and Mo Additions on the Suppression of HAZ Softening of Friction Stir Welded Si-Mn Martensitic Steel
||Zexi Wu, Kohsaku Ushioda, Hidetoshi Fujii
|On-Site Speaker (Planned)
In recent years, the demand for Advanced High Strength Steels (AHSS) has significantly increased. However, cracking at the fusion welded joints of these steels tends to occur due to the formation of brittle martensite accompanied with the HAZ softening. In our previous study, the FSW joint of 0.2%C-2%Si-3%Mn (wt.%) martensitic steel was investigated, and a good balance of strength and ductility was obtained in the stir zone due to the grain refinement of the prior austenite induced by the dynamic recrystallization of the austenite during FSW. However, the HAZ softening occurred because the martensite structure of the base material was tempered during FSW. In this study, to suppress the HAZ softening and to further improve the properties of the stir zone, V or Mo was added to 0.2%C-2%Si-3%Mn steel and the effects of alloying element addition on the microstructure and mechanical properties of the FSW joints were investigated.