GH4169 合金"等温锻造+直接时效"工艺探讨

利用Gleeble 15 0 0热力模拟实验机研究了温度、速率、变形量等对GH416 9合金等温变形力学参数及组织变化的影响。在较高的温度及较低的速率下 ,该合金的变形抗力显著降低 ,但变形后组织粗大 ;“等温成形 直接时效”后材料的室温拉伸、高温拉伸、高温持久等性能优于成形后再“固溶 时效”的性能。在 2 0 0t液压机上利用镍基高温合金模具进行了某航空发动机一级涡轮盘 1/4模拟件的等温成形 ,成形件外形良好 ,成形及直接时效后零件的材料组织细小均匀

Exploration of Process"Isothermal Forging+Direct Aging"for GH4169 Alloy

The influences of temperature, strain rate, strain on mechanical parameters and microstructural evolution in isothermal deformation of GH4169 alloy were investigated.Lower resistance is obtained under higher temperature and/or lower strain rate. However, coarser microstructure also is gained under such condition. The tensile properties at room temperature and elevated temperature, permanent properties at elevated tempaerature of the GH4169 alloy with the treatment of "direct aging after isothermal deformation" are better than those of the same alloy with the treatment of solid solution aging after isothermal deformation. Isothermal forming was undertaken for a 1/4 size simulated part of a kind of turbo disk of a aviation engine. Its externas is fine and the microstructure of the material was fine and homogeneous for both straightly after forming and after direct aging.