Analysis on the Structural Transformation of ITER TF Conductor Jacket Tube

For ITER TF jacket tube, induced γ-α′ phase change is related to both temperature and structure deformation, decreasing temperature less external energy is needed. The maximum phase change is occurred at fracture, a gradual transformation occurs parallel the longitudinal direction. Particularly, α′ phase is prone to form at the boundaries of initial austenite grains, uniformly dispersed in the austenite structure.