Simulation Of Isothermal Forging For Superalloy And Analysis Of Thermal Load On Die

The isothermal forging is a kind of special forging method which was developed in the last year. In the process of the isothermal forging, the temperature of the die and the workpiece is same, what's the important is that the higher temperature and the lower deformed velocity are used. The workpiece produced with the method of isothermal forging is in procession of many strong points such as tissue uniform, isotropy, excellent technical capability, small spring-back and small error dimension etc. Now, with the development of aviation, many special material such as Ti, Ni, P/M superalloy and nonmetal material have been widely used. Isothermal forging has come to be one of the primary technics in the process of machining aviation material.FGH96 superalloy, which is newly developed in China, is a kind of Ni-base powder metallurgy (PM) superalloy. It has been the key material for most turbine discs of advanced aero-engines at present time. However, PM superalloy is hard to deformation which has a high resistance of deformation, a narrow variation range of deformation parameters and unstable microstructure after forging. Based on the systematic analysis of the characteristics of FGH96 superalloy, the die design is necessary to explored. There are all kinds of destruction forms and invalidation reasons for hot forging dies. There are also a lot of factors which affect the service life of dies in practical forging process. In this paper, researchers for isothermal forging dies of powder superalloy disk was done, and the main reasons that reduced the service life of such type of dies was analyzed detailedly.The isothermal deformation of FGH96 superalloy disc was simulated by the MSC. superforge. The results show that at the end of deformation, the loads rise rapidly, which exceed the tonnage that the equipment can hold. Therefore, the method of preforging is provided for finishing the deformation. The previous two designs had some bug, but after amending, the material can fill the die cavity.The two-step upsetting forming of FGH96 P/M disc preform has been simulated with different circular radius dies. On the basis of the simulation, the rules of the effect of circular radius on relative diameter ratio and uniform degree of disc preform are analyzed. At the same time, the distribution regulation of effective strain rate...