为解决铸造高温合金涡轮叶片由于工艺固有特性而在内部产生的疏松、气孔及残余共晶等冶金缺陷的问题，采用标准热处理和热等静压处理（HIP）+标准热处理两种工艺对铸造涡轮叶片及其同炉试样进行试验，并对试样进行了差热分析、密度测试、力学性能测试及X射线三维成像，对比分析不同工艺的处理效果。结果表明：相比标准热处理，热等静压处理+标准热处理试样的屈服强度上升3%，抗拉强度上升1.4%，延伸率和断面收缩率分别上升28.1%和51.5%，持久寿命上升16.6%，内部显微疏松和气孔等缺陷的闭合程度达99.8%；铸造涡轮叶片增加热等静压处理可有效闭合铸件内部疏松，提高合金致密度、力学性能，进而提高铸件合格率。

In order to solve the problems of metallurgical defects in cast turbine blades made of nickelbased superalloy due to inherent characteristics of process, such as porosity, pores and residual eutectic, two kinds of processes called standard heat treatment and hot isostatic pressing (HIP) plus standard heat treatment were applied to test cast turbine blades and specimens of the same cast batch. Then differential thermal analysis (DTA), density test, mechanical properties test and Xray 3D imaging were carried out to comparatively analyze to the treatment effect of different processes. Results show that comparing to standard heat treatment, specimens yield strength from HIP plus standard heat treatment increases by 3%,tensile strength increases by 1.4%, elongation and reduction of area increase by 28.1% and 515% separately, endurance lifetime increases by 16.6%, and the closure degree of internal microporosity and pore is 99.8%; HIP treatment added to the cast turbine blade can eliminate internal porosity effectively and increase the density and mechanical properties of the alloy, in addition to improve the qualification rate of castings furtherly.

TG115.6

国家科技重大专项（J2019-Ⅵ-0009-0123）