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对IN690高温合金管材挤压过程进行了微观组织数值模拟,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试验值的相对误差小于12%。
The microstructure of IN690 superalloy extrusion was numerically simulated and the dynamic recrystallization and average grain size under different extrusion conditions were obtained. The results show that with the extrusion speed and extrusion ratio under certain conditions, as the extrusion temperature increases, the complete dynamic recrystallization region becomes larger and the average grain size increases. Under the conditions of extrusion speed and extrusion temperature , The area of complete dynamic recrystallization becomes larger and the average grain size decreases with the increase of extrusion ratio. The average grain size from the inner wall to the outer wall of the pipe increases first and then decreases, and the average crystal The relative error between the simulated value of the grain size and the test value is less than 12%.