材料期刊网

采用相同规格 TA15棒材分别利用800MN 模锻压力机、1 MJ 对击模锻锤制备同种形状钛合金大型航空模锻件，对两种模锻条件下的锻件组织及力学性能进行了对比研究。结果表明：800MN 制备的锻件塑性流线分布好，每火次变形量大、变形速率低，比1 MJ 锻件再结晶晶粒尺寸小、等轴初生α相比例高且颗粒更加细小，室温、500℃高温拉伸性能以及冲击韧性和断裂韧性均有所提高。

800MN die-forging press and 1 MJ die-forging hammer were employed on TA15 titanium alloy to produce large aerial forg-ings.Microstructure and mechanical properties of TA15 forgings under the two forging equipments were investigated and compared.Re-sults show that the forgings under 800MN die-forging press have a preferable plastic flow.The 800MN die-forging press will cause lager deformation and lower strain rate during every heating.The forgings under 800MN die-forging press have more fine grain size after re-crystallization compared with those under 1 MJ die-forging hammer.It also had a higher percentage of primary alpha phase as well as more fine αprecipitation under 800MN die-forging press.As a result,its tensile properties and impact toughness and fracture toughness of the forgings are higher than those under 1 MJ forging.Furthermore,the costs and quality are more ideal under 800MN die-forging press because the strain and strain rate are more controllable and the forging times are less.