Numberical Simulation On The Forming Process Of The GH2674 Alloy Large Turbine Disk

The Special Steel Branch, Baoshan Iron & Steel Co., Ltd was in charge of the development and fabrication of large superalloys turbine disk so as to meet the demand of National 863 Project. Since the large superalloys turbine disk with the diameter about 2000mm has never been produced in China before, it is a very important issue to choose the forging equipment. Therefore, the aim of this project is, by simulating the forging process of large GH2674 turbine disk, to determine the tons for the forming process, to choose the forging equipment and to set the forming parameters as well.The main content are as following,1. For the free upsetting forming, the forming processes with single heating and multiple heating have been simulated, and the deformation force, and the temperature fields during the process have been analyzed. By the simulation results, it was found that, if the traditional forging technique is applied, the forging equipment must have a forging ability more than 45000 tons. As the largest forging equipment currently in China has a forging ability with 30000 tons, it is impossible to produce the large GH2674 turbine disk with the traditional forging process.2. A new forging process for the turbine disk, named as partitioning forging, has been simulated. By analyzing the simulation results, the deformation characteristics of partitioning forging, the stress/ strain fields and the temperature fields have been investigated. The forging force and the deformation have been determined also. These studies on the partitioning forging process provides a theoretical support to the invention of the new process. In practical production, the largest superalloys turbine disk in China, with the diameter of 2200mm , has been produced by this partitioning forging technology, which is very important to the development and manufacturing of heavy gas turbine for our country.The simulation of the forming process for large GH2674 turbine disk is a very successful application of numerical modeling in the manufacturing of special steel. Along with the application of the advanced numerical modeling technology, the development of new technology and new process will become more accurate and the development cycle will be reduced. The computer simulation technology will see more application and brighter prospect in the forming field of special steel in the future.