Simulation and experimental research on isothermal forging with semi-closed die and multi-stage-change speed of large AZ80 magnesium alloy support beam
Simulation and experimental research on isothermal forging with semi-closed die and multi-stage-change speed of large AZ80 magnesium alloy support beam
复制标题
大型AZ80镁合金支撑梁半闭模多级变速等温锻造仿真与试验研究
DOI：
10.1016/j.jmatprotec.2017.03.015
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发表时间：
2017-08-01
影响因子：
6.3
通讯作者：
Guo, Wanfu
中科院分区：
文献类型：
--
作者：
He, Hailin;Huang, Shiquan;Guo, Wanfu
对大型AZ 80镁合金支撑梁的模具结构和成形参数进行了数值模拟优化，并在40 MN数控液压机上进行了支撑梁的实验成形。研究结果表明，采用半封闭式模具，阶梯形支撑梁锻件变形充分均匀。而且，锻件可以用简单的长方体坯料一次填充，从而大大缩短了锻造过程。多级变速等温锻造技术在最终成形过程中使用0.005 mm/s的超低速。得到的坯料完全软化，这大大降低了成形载荷至小于40 MN。采用半闭式模多段变速等温锻造工艺，生产出大型镁合金支撑梁模锻件。成形后的锻件晶粒细小且分布均匀。主要强度承受部分（底部）的纵向和横向拉伸强度分别为394 MPa和398 MPa，它们的延伸率分别为9.6%和9.8%。此外，这些锻件还被加工成零件，并在成功用于直升机之前通过了试载测试。(C)2017爱思唯尔B. V.保留所有权利。
Numerical simulation to optimize the mold structure and forming parameters for a large AZ80 magnesium alloy support beam and experimental formation of the support beam using a 40 MN numerically controlled hydraulic press were carried out. The research results showed that use of a semi-closed mold resulted in full and even deformation of the stair-like support beam forging. Also, the forging could be filled in one step with simple cuboid-shaped billets, thus greatly shortening the forging process. The technique of isothermal forging with a multi-stage-change speed used an ultra-low speed of 0.005 mm/s during the final forming process. The resulting billet was fully softened, which greatly reduced the forming load to less than 40 MN. Die forgings of the large magnesium alloy support beam were thus produced through isothermal forging with a semi-closed die and multi-stage-change speed. Fine and evenly distributed grains were observed for the formed forgings. The longitudinal and transverse tensile strengths of the main strength-bearing part (bottom) were 394 MPa and 398 MPa, respectively; their percentage elongations were 9.6% and 9.8%, respectively. In addition, the forgings were processed into parts and passed a trial loading test before being successfully used in helicopters. (C) 2017 Elsevier B.V. All rights reserved.