关键词: Hastelloy C-276合金, 冷轧压下率, 微观组织, 力学性能, 织构

Abstract: Effect of cold rolling with different reduction rates on microstructure and mechanical properties of Hastelloy C-276 nickel-based alloy at room temperature was studied by using electron backscatter diffraction (EBSD), field emission scanning electron microscope (SEM), tensile test and other technologies. The results show that the annealed C-276 alloy contains a large number of annealing twins, and the twin boundaries account for about 43.7% of the total grain boundaries, the tensile strength is 831.0 MPa, and the elongation after fracture is 45.0%. When the reduction rates are 16% and 26%, nanocrystals are formed on the surface of the specimen, while the core grains have no obvious change, resulting in a gradient distribution of the plate structure, the tensile strength increases to 914.0 MPa, and the elongation after fracture decreases to 13.6%. When the reduction rate increases to 36%, the deformation penetrates into the core of the specimen, and the gradient structure disappears, the tensile strength increases to 927.0 MPa, and the elongation after fracture increases to 39.2%. When the reduction rate increases to 45%, the grains are elongated along the rolling direction, the complete coherent relationship of twins is destroyed, and strong Brass texture {011}<211>, Goss texture {011}<001>, Cu texture {112}<111> and S texture {123}<634> are generated in the structure. The tensile strength increases to 1175.7 MPa, and the elongation after fracture decreases to 10.2%.

Key words: Hastelloy C-276 alloy, cold rolling reduction rate, microstructure, mechanical properties, texture