The Study Of Grain Uniformity During Forging Process Of GH4169 Alloy Turbine Disc

A series of aerospace projects represented by large aircraft have greatly improved the development of the high-end manufacturing industry in China. And the design and manufacture of aircraft engine is one of the core technologies which require more efforts to conquer in aerospace projects. Turbine disk, as a key component of aircraft engine, works in harsh operating environment, such as high temperature, high speed and heavy load. Therefore, the organization and performance is highly required. As for the turbine disk, which takes GH4169 alloy as forging material, due to the difficulty in forging process, it is hard to guarantee the uniformity of forging organization, and as a result influences the usability of turbine disk and the safety of engine.This paper takes forging piece of the GH4169 turbine disk as research target, and then obtained the evolution pattern of GH4169 grain in the process of thermal deformation and soaking heating through precise tests and experiments. Then this paper combined the test results and the software of finite element analysis together to establish the predicting platform of GH4169 turbine disk forging grain, which was eventually applied into the forging technology analysis of this forging piece.This paper obtained the stress-strain curve of GH4169 through the hot compression texts, whose deformation temperature ranged from 900{ to 1100{ and the strain rate from 0.001s-1 to 10s-1 respectively. And then the relevant models of the dynamic recrystallization percent and the dynamic recrystallization grain size of GH4169 was established through regression analysis. In addition, based on the grain growth test and metallographic analysis, the model of GH4169 grain growth was established. Besides, the related parameters on thermal physical properties of GH4169 was obtained through a scientific thermal physical properties test and calculation.This paper established a predicting platform of GH4169 grain size based on physical model and finite element software, and then provided an evaluation method on the grain uniformity of turbine disk organization. Besides, it also conducted an in-depth analysis on the relationship between the forging technology of GH4169 turbine disk and the grain organization of forging piece, so as to obtain an optimized forging technology of GH4169 turbine disk.