Transactions of Materials and Heat Treatment

Title：Research on forgeability of die forgings for large aircraft landing gear

Authors： Zhao Mingjie Huang Liang Li Jianjun Zeng Rong Zhang Xiaoting Zhang Han Li Pengchuan

Unit： Huazhong University of Science and Technology China National Erzhong Group Deyang Wanhang Die Forging Co. Ltd.

KeyWords： landing gear forgeability die forging grain size recrystallization volume fraction

ClassificationCode：TG316.3

year,vol(issue):pagenumber：2020,45(9):1-7

Abstract：

The design route of die forging process for landing gear was designed by the inverse finite element method, and the three-dimensional finite element models of pre-forging and final forging processes were established, respectively. Then, the changes of grain size and forgeability for large aircraft landing gear during different forging processes were analyzed. The results show that the forging process has an important effect on the residual strain and the grain size distribution of finial forgings, and the forging process of pre-forging and final forging is better than other forging processes. The final forging process of large aircraft landing gear inherits the residual strains of pre-forging result and leads to a reduction of the residual strain for final forging process, and the maximum residual strain of final forgings is 0.272. Furthermore, the final forging process inherits the recrystallization volume fraction and grain size of pre-forging result to effectively improve the recrystallization volume fraction of difficult-to-form area and refine the grain size, and the average recrystallization volume fraction and the average grain size are 80% and Φ40 μm, respectively. Thus, the forging process of pre-forging and final forging improves the forgeability of materials and forms the forgings that meet the requirements of using.

Funds：

国家自然科学基金资助项目（51435007）；国家重点研发计划（2018YFB1106003）

赵明杰（1995-），男，博士研究生 E-mail：zmj2017@hust.edu.cn 通讯作者：黄亮(1981-)，男，博士，副教授 E-mail：huangliang@hust.edu.cn

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