电液锤上GH901合金涡轮盘模锻成形工艺

Forging Process in Electro-hydraulic Hammer of GH901 Turbine Disk

目的研究GH901合金涡轮盘锻件的成形工艺。方法采用有限元软件Simufact-2D对镍基高温合金涡轮盘的锤上模锻过程进行数值模拟分析,研究不同中间坯高径比下涡轮盘的填充效果及等效应变变化规律;研究不同锤击能量下涡轮盘的温度分布规律。结果 GH901合金涡轮盘锤上模锻时,中间坯高径比过大或过小均影响填充效果,同时不同高径比下模锻的等效应变也有差异。当高径比为0.21时,锻件填充效果最好,且应变分布均匀。随着锤击能量的增加,锻件心部产生温升的程度增大,锤击时交替采用50%和80%的能量打击,可得到温度分布较合理的锻件。结论中间坯高径比和锤击能量对GH901合金涡轮盘的锻造变形行为有显著影响,选择合适的锤上模锻工艺参数可以得到尺寸精度高、组织均匀且性能优良的涡轮盘锻件。

The work aims to study the forming process of GH901 turbine disk forging. The finite element software Simufact-2 D was used to simulate and analyze the hammer forging process of nickel-based superalloy turbine disk. The filling effect and equivalent strain law of turbine disk with different height diameter ratio of intermediate billet were studied. The temperature distribution of turbine disk under different hammering energy was investigated. The filling effect of GH901 turbine could be affected for hammer forging if the height diameter ratio of intermediate billet was too large or too small. At the same time, the equivalent strain of hammer forging also changed with different height diameter ratio of intermediate billet. The filling effect was the best and the strain distribution was uniform when the height-to-diameter ratio was 0.21. The degree of temperature rise in the center of forging increased with the increase of hammering energy. The forging with reasonable temperature distribution could be obtained by alternately using 50% and 80% energy during hammering. The forging deformation behavior of GH901 turbine disk is significantly affected by the height-to-diameter of intermediate billet and hammering energy. The turbine disk forging with high dimensional accuracy, uniform microstructure and excellent properties can be obtained by selecting appropriate hammer forging process parameters.