NUMERICAL SIMULATION OF RING ROLLING PROCESS FOR Ni-BASE ARTICLES

Continuous improvements of properties for individual parts are indispensable for perpetual development of aircraft engines. Concerning casing and seal, simulation of ring rolling process is one of the most attractive tools to reduce the cost and time and to improve the properties and the reliability at the same time. In order to obtain both practical prediction accuracy and acceptable computation time from industrial standpoint, the refined partial three-dimensional deformation model was proposed. Moreover the relationship between microstructure evolution and various parameters regarding to Waspaloy* was evaluated and microstructure prediction models were developed. Constructed microstructure prediction models were coupled to the finite element analyzing system to estimate mean grain diameter and fraction of recrystallization in addition to general output e.g. temperature, strain. The effectiveness of proposed prediction system as a process design tool was confirmed through multi compression test and production of actual casing that had extremely complicated near-net-shape.