3D/4Dイメージングによるフェライト/オーステナイト鋼の加工誘起変態・損傷挙動の直接可視化

抄録

The fracture behavior of ferritic/austenitic steel is closely related the deformation-induced transformation of retained austenite phase to martensite. In this study, it is conducted that visualization of deformation-induced transformation and fracture behavior of ferritic/austenitic steel with 3D/4D imaging in SPring-8. While austenite grains mostly transformed to martensite in a strain range up to 6.8%. there are also untransformed grains in a same strain range. Therefore, it was found that the transformation behavior is inhomogeneous. Some austenite grain has complex geometric shape tends to transform to martensite, others do not transform. It is considered that the deformation-induced transformation behavior is dominated by several factors including the grain shape.