镁合金精密温锻材料性能的研究

介绍了研究镁合金材料性能的温锻方法。镁合金的屈服应力显示了明显的加工软化现象，并导致在锻造过程开始时出现高的峰值负载。为了降低初始锻造峰值负载提出了坯料形状的新概念。这种形状是精心设计的，因此所给的预应变在锻造过程的起初阶段并不约束坯料流动，并且以后充填模具型腔时的屈服应力较低。本文提出的这种方法通过有限元模拟和伺服控制液压机试验后证实是有效可行的。

A new warm forging method for magnesium alloys is proposed by taking their material properties into account. The flow stress of Mg alloys exhibits a significant work softening phenomenon, and a high peak load tends to appear at the beginning of the forging process. In order to reduce the initial peak forging load, a new concept of billet shape is proposed; the shape is so chosen that prestraining is given without restraining the material flow in the early stage of the process and then die filling is attained with a low flow stress. In this study, the proposed forging method is confirmed to be valid through finite element simulation and experiment using a servo-controlled press.