ZL116合金的半固态模锻成形组织与性能

采用300 t压力机,对半固态ZL116合金进行了模锻成形实验.结果表明:半固态模锻成形可以获得组织致密、轮廓清晰、充型完整的成形件;成形件微观组织主要为细小、分布均匀的近球状和蔷薇状非枝晶组织;同时由于成形静压力的作用引起局部组织发生塑性变形,使半固态模锻件的性能明显优于液态模锻件的性能,硬度可达65.7 HB,高于液态模锻件20.5%,为半固态加工技术在战车上的应用奠定了基础.

Microstructure and Properties of Semi-solid ZL116-Alloy Die Forgings

Die forging tests were conducted on a 300 t press to form semi-solid ZL116-alloy parts. The results showed that the die forging process is suitable for semi-solid metal because the parts thus formed show compact structure and clear shape with die space fully filled up. The microstructure of such parts is mainly the fine and uniformly distributed near spheroid and nondendritic rosette. In addition, plastic deformation was found locally under the action of static pressure for part forming, which makes the mechanical properties of semi-solid die forgings superior to that of die castings formed from liquid, e. g., their hardness comes to 65.7 HB or 20.5 % higher than die castings. The testing results lay down a foundation for applying such parts to military vehicles.