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对IN690高温合金管材挤压变形过程中的动态再结晶进行了模拟研究,获得了不同挤压工艺条件下动态再结晶与平均晶粒尺寸的变化规律。研究表明:在挤压速度和挤压比一定的条件下,随着挤压温度的升高,完全动态再结晶区域变大,平均晶粒尺寸增大;在挤压速度和挤压温度一定的条件下,随着挤压比的增大,完全动态再结晶区域变大,平均晶粒尺寸减小;管材壁厚方向上由内壁向外平均晶粒尺寸呈现先增大后减小的规律;平均晶粒尺寸的模拟值与实验值的相对误差小于12%。
The dynamic recrystallization in the process of extrusion deformation of IN690 superalloy was simulated and the dynamic recrystallization and average grain size under different extrusion conditions were obtained. The results show that the complete dynamic recrystallization region becomes larger and the average grain size increases with the increase of extrusion temperature at a certain extrusion speed and extrusion ratio. When the extrusion speed and extrusion temperature are constant Under the conditions, the complete dynamic recrystallization region becomes larger and the average grain size decreases with the increase of extrusion ratio. The average grain size increases from the inner wall to the outside and then decreases in the wall thickness direction. The relative error between the simulated value of the average grain size and the experimental value is less than 12%.