飞机起落架外筒锻件形状复杂,利用数值模拟对其成形过程中的微观组织演变进行预测意义重大。以300M高强钢主起落架外筒锻件为研究对象,制定锻件的锻造工艺,将300M高强钢的微观组织模型写入DEFORM-3D软件,对材料热成形过程中的组织进行预测。结果表明,采用所制定的锻造工艺成形后的锻件晶粒尺寸较细小,并与实验结果进行了对比,吻合性较好,验证了该模拟的正确性。 Aircraft landing gear outer cylinder forgings shape complex, the use of numerical simulation of its microstructure evolution in the forming process is of great significance. Taking the forging of the main landing gear of 300M high strength steel as the research object, the forging process of the forging was established. The microstructure model of 300M high strength steel was written into the DEFORM-3D software to predict the structure of the material during the hot forming process. The results show that the grain size of forging formed by the forging process is small, and compared with the experimental results, the good agreement is verified, and the correctness of the simulation is verified.