[G] Joining and Plastic Forming of Structural Materials

9:00 AM - 9:15 AM JST(12:00 AM - 12:15 AM UTC)

[336] Spatially heterogeneous martensitic transformation of friction stir welded super Invar alloy

○Takayuki Yamashita¹, Stefanus Harjo², Motomichi Koyama³, Wu Gong², Takuro Kawasaki², Kohsaku Ushioda¹, Hidetoshi Fujii¹ (1. The University of Osaka, 2. Japan Atomic Energy Agency, 3. Tohoku University)

Keywords:

Friction stir welding,Invar alloy,Martensitic transformation,Grain refinement,Cryogenic temperature

In this study, friction stir welded super Invar alloy joints were cooled to cryogenic temperatures, and the factors contributing to the spatial heterogeneity of the resulting martensite, as well as its relationship to the microstructure formed by friction stir welding, were investigated.