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针对所构建的GH738高温合金热变形过程动态再结晶、亚动态(静态)再结晶和晶粒长大的晶粒组织演化模型,利用FORTRAN语言将锻造变形过程中所有模型写入有限元软件MSC.SUPERFORM的用户子程序中,对软件进行二次开发并对该高温合金晶粒组织演化进行数值模拟.通过对Gleeble热压缩试样及直径250 mm涡轮盘实际锻造结果与数值模拟进行对比分析,证实了GH738高温合金显微组织演化模型的正确性和该软件二次开发的可行性.对直径1250 mm超大型涡轮盘生产进行模拟预测,模拟结果显示适宜的热加工条件为变形温度1040—1100℃,锻造速度10-25 mm/s;同时与实际在变形温度1080℃,变形速度10 mm/s条件下锻造的直径1250 mm超大型涡轮盘组织进行比较,发现该模拟结果与实际结果吻合性较好,基本达到了组织的精确预测控制.此外,结合以上锻造及模拟经验,对国内GH738高温合金直径1400 mm特大型涡轮盘进行了锻造组织预测.
Aiming at the dynamic recrystallization, sub-dynamic (static) recrystallization and grain growth evolution model of the GH738 superalloy, the FORTRAN language was used to write all the models during the forging deformation into the finite element software MSC. SUPERFORM user subroutine, the software was developed for the second time and the grain structure evolution of the superalloy was numerically simulated.By comparing the actual forging results of Gleeble hot-compression specimen and diameter 250 mm turbine disc with the numerical simulation, it was confirmed The correctness of the microstructure evolution model of GH738 superalloy and the feasibility of the secondary development of the software were also studied.A simulation prediction was made on the production of 1250 mm diameter super-large turbine disk. The simulation results showed that the suitable thermal processing conditions were the deformation temperature 1040-1100 ℃ , And the forging speed is 10-25 mm / s. Meanwhile, compared with the forged 1250 mm diameter super-large turbine disk which is actually forged at the deformation temperature of 1080 ℃ and the deformation speed of 10 mm / s, the simulation results are in good agreement with the actual results Good, basically reached the organization’s accurate predictive control.In addition, combined with the above forging and simulation experience, the domestic GH738 superalloy 1400 mm diameter Turbine disk was forged structure prediction.