Dziubińska Anna, Surdacki Piotr, Majerski Krzysztof
Faculty of Mechanical Engineering, Lublin University of Technology, 20-618 Lublin, Poland.
Materials (Basel). 2021 May 16;14(10):2593. doi: 10.3390/ma14102593.
This article presents the analysis of the deformability, structure and properties of the AZ61 cast magnesium alloy on the example of a new forging process of aircraft mount forgings. It was assumed that their production process would be based on drop forging on a die hammer. Two geometries of preforms, differing in forging degree, were used as the billet for the forging process. It was assumed that using a cast, unformed preform positively affects the deformability of hard-deformable magnesium alloys and flow kinematics during their forging and reduces the number of operations necessary to obtain the correct product. Numerical analysis of the proposed new technology was carried out using DEFORM 3D v.11, a commercial program dedicated to analyzing metal forming processes. The simulations were performed in the conditions of spatial strain, considering the full thermomechanical analysis. The obtained results of numerical tests confirmed the possibility of forming the forgings of aviation mounts from the AZ61 cast magnesium alloy with the proposed technology. They also allowed us to obtain information about the kinematics of the material flow during forming and process parameters, such as strain intensity distribution, temperatures, Cockcroft-Latham criterion and forming energy. The proposed forging process on a die hammer was verified in industrial conditions. The manufactured forgings of aircraft mounts made of AZ61 magnesium alloy were subjected to qualitative tests in terms of their structure, conductivity and mechanical properties.
本文以飞机支架锻件的新型锻造工艺为例，对AZ61铸造镁合金的可锻性、结构和性能进行了分析。假设其生产工艺将基于模锻锤上的模锻。两种锻造程度不同的预成型坯几何形状被用作锻造工艺的坯料。假设使用铸造的、未成型的预成型坯对难变形镁合金的可锻性及其锻造过程中的流动运动学有积极影响，并减少获得正确产品所需的操作数量。使用DEFORM 3D v.11对所提出的新技术进行了数值分析，DEFORM 3D v.11是一款专门用于分析金属成型过程的商业软件。模拟是在空间应变条件下进行的，考虑了完整的热机械分析。数值测试获得的结果证实了采用所提出的技术用AZ61铸造镁合金成型航空支架锻件的可能性。这些结果还使我们能够获得有关成型过程中材料流动运动学以及工艺参数的信息，如应变强度分布、温度、考克罗夫特 - 拉瑟姆准则和成型能量。所提出的模锻锤锻造工艺在工业条件下得到了验证。对由AZ61镁合金制成的飞机支架锻件进行了结构、导电性和力学性能方面的质量测试。
