以叶片中的一类重要叶片--钛合金单榫头叶片为研究对象,利用自主开发的并经实验验证的叶片精锻三维有限元变形-传热-微观组织演变耦合模拟系统对其精锻过程进行了模拟,研究了不同工艺参数下叶身典型截面锻后微观组织的分布规律.结果表明:随着变形温度的升高,晶粒尺寸和β相体积分数增大;随着变形速度的增大,晶粒尺寸和β相体积分数相应增大;随着模具温度的升高,晶粒尺寸分布的均匀性提高;而摩擦条件对晶粒尺寸和β相体积分数的影响不显著.
The blade with a tenon of the titanium alloy is one of important types of blades. Its precision forging process is simulated and analyzed using a three-dimensional (3D) coupled deformation-heat transfer-microstructure evolution FEM code developed by the authors, whose reliability was verified. The distribution laws of the microstructure in the typical section under different processing parameters during the blade precision forging process of the titanium alloy are obtained and conclusions can be drawn as: grain size and volume fraction ofβ phase increase when initial temperature of billet or speed of die rises; friction condition has little effect on them and their distribution becomes more even when initial temperature of die increases.
参考文献
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