In-situ EBSD study of 409 L ferritic stainless steel during tensile testing

Abstract

Two ferritic stainless steel (FSS) specimens, denoted as loading axis along the rolling direction(LR) and the transverse direction(LT) respectively, were produced to elucidate the mechanical anisotropyof409L FSS at grain scale. This approach was realized by the combination of in-situ tensile test and field emission scanning electron microscopy (SEM) with electron backscattering diffraction (EBSD) at room temperature. Microstructure evolution, grain orientation rotation, and crystallographic slip were investigated in the tensile test. During tensile deformation, the tensile axis of LR specimens rotated towards the <101> direction, which is the stable end orientation of body-centered cubic (BCC) metals. However, the rotation of tensile axis towards <101> was restrained in LT specimens due to the operation of less favorable slip systems. {110}<111> was the most favorable slip system in both specimens. The mechanical anisotropy in grain scale is due to different slip behaviors of LR and LT specimens.

Lattice Rotation Dependence on Microstructural Characteristics in a Low Carbon Steel

“…A number of coordinated strengthening mechanisms worked together during the deformation process to boost the alloy's strength. Chen and Wang [12] conducted a comparable work in which they examined 409 L ferritic stainless steel in situ using EBSD during tensile testing. The tensile axis of the rolling direction specimens rotated in the direction of <101> during tensile deformation, which was the stable end orientation of body-centered cubic (BCC) metals.…”