Deformation texture and dislocation density evolution for multilayer metals with laminate/network interface during in situ tensile deformation

Liu, B. X.*; Lin, Z. M.*; 佐藤 成男*; 徐 平光   ; Yin, F. X.*

Liu, B. X.*; Lin, Z. M.*; Sato, Shigeo*; Xu, P. G.; Yin, F. X.*

The warm rolled multilayer steel presents laminate/network coupling interface and ultrafine fiber/ultrafine grain structure. It achieves high strength, high cryogenic Charpy V-notch impact toughness and excellent reverse temperature effect. This is close related to the delamination of heterogeneous interface, ultrafine fiber grains, deformation texture and dislocation density characteristics of multilayer steel. In the study, the in situ neutron diffraction based on iMATERIA was employed to deeply monitor the deformation textrure and dislocation density evolution behavior during tensile deformation of multilayer metals. The Brass {110}112 texture in the FCC layers and the rotated cube {100}110 texture in the BCC layers suggest clearly the heterogeneous deformation crystallographic texture evolution behavior of multilayer metals with laminate/network coupling in SUS430/SUS304 steels during tensile deformation. The dislocation density in the BCC phase increases with the tensile deformation but no significant change appears in the FCC phase. The grain size of the BCC layers decreases during the tensile deformation, however, the grain size in FCC phase also decreases during the tensile deformation. Such interesting phenomenon is related to the martensitic transformation of FCC phase induced by the tensile deformation.