Exploring the Influence of Rolling Conditions on the Texture and Mechanical Properties of Sintered Fe36Ni Alloy
摘要
A comprehensive investigation is conducted to explore the effect of rolling at room temperature and liquid nitrogen temperature, as well as the influence of strain paths, on the texture and mechanical properties of sintered Fe36Ni alloy. Phase and microstructure analysis using x-ray diffraction and scanning electron microscopy reveals that the sintered Fe36Ni alloys consist of a dual-phase structure containing body-centered cubic and face-centered cubic phases. Bulk texture measurements are performed on all samples to investigate texture development during the various rolling conditions. Unidirectional rolling results in strong Goss texture due to shear deformation, whereas multi-step cross-rolling results in the formation of strong Brass texture in the face-centered cubic phase, suggesting that deformation is assisted by twinning. In contrast, in the body-centered cubic phase, a strong γ-fiber texture with maximum intensity around the {111} < 110 > component forms, regardless of the strain path. Further, the mechanical properties of all samples are evaluated through hardness and tensile testing. The sample rolled under liquid nitrogen temperature with unidirectional rolling exhibits increased hardness, attributed to higher dislocation density. Tensile testing reveals that the sample subjected to unidirectional rolling demonstrates higher strength compared to the multi-step cross-rolled sample due to the development of the Goss texture during rolling. Fractographic analysis of all tensile samples indicates that the sintered sample possesses high ductility, characterized by the presence of numerous large dimples. Rolling reduces the size and depth of dimples, with unidirectional rolling producing finer grains and smaller dimples. Additionally, a cleavage plane is observed in the sample rolled at liquid nitrogen temperature.
Graphical Abstract