A material processing method that gradually reduces the thickness of a material. The raw materials for cold rolling are generally steel coils that have undergone hot rolling and heat treatment. During the cold rolling process of nickel based alloy Hastelloy plates, alloy plate cold rolling refers to forging materials at room temperature. The preparation of metastable austenite undergoes strain induced martensitic transformation, which increases the strength and hardness of the steel, reduces plasticity, and leads to significant work hardening.
With the increase of forging passes, the total deformation rate of the forging increases, the work hardening effect becomes more and more obvious, and the material becomes harder and harder. Nickel based high-temperature alloys in the conventional heat treatment state have low strength and hardness, good plasticity, and are conducive to forging. If high-temperature alloys are directly cold-rolled without heat treatment, the material production cost can be greatly reduced.
The strength of high-temperature alloys under heat treatment and hot rolling conditions was analyzed, and the technical parameters for trial rolling were determined. The mechanical properties of the trial rolled products were compared. 1. Mechanical performance analysis: The production site tested the coiled samples of nickel based alloy Hastelloy in hot rolling state and hot rolling heat treatment state, and compared the results. Comparing the mechanical properties of hot-rolled and hot-rolled heat-treated nickel based alloys, it can be seen that the average yield strength of the container plate is 80.9MPa, the average tensile strength is 40.7MPa, and the elongation rate is 5.7%, which is lower than that of the hot-rolled and heat-treated states.
From the perspective of mechanical properties, there is not much difference in strength between hot-rolled nickel based alloy plates before and after heat treatment. The hardening process of hot-rolled untreated materials is slightly faster than that of heat-treated materials, but not significantly, and the load variation of cold rolling equipment is not significant.
