Large rings are key forgings for aero-engines. The large ring formed by rolling technology has the advantages of compact structure, high strength and good toughness, which can not be replaced by casting or other manufacturing technology. The performance and quality of ring forgings determine the performance and behavior of key aviation parts to a large extent. The structure and performance of large rings are often directly related to the service life and reliability of the aircraft. Whether the ring forging is integral, high quality and high precision has a significant impact on the economic bearing capacity of the aircraft and the aero engine. Therefore, the production quality and manufacturing process of the special-shaped ring similar to the part type line have a very important influence on reducing the cost of engine development and improving the engine development and production capacity.

The production process of large ring parts includes steelmaking, ingot casting, forging, heat treatment, rough machining and so on. Not only are there many processes and long cycles, but the execution of each link will have a significant impact on the performance and quality of large rings. Therefore, for those who are engaged in large-scale heat treatment work, it is necessary to understand the impact of the implementation of each large-scale forging process and the heat treatment process, and sometimes even modify (or arrange) the subsequent heat treatment process according to the implementation of the pre-process. In the formulation of heat treatment process, the experience and accumulated data obtained by others (including former and foreigners) and themselves through years of production practice are very important and valuable, and should be fully utilized and used for reference. But that alone is not enough. We must also strive to absorb all the useful and effective things in modern scientific and technological achievements, and make full use of large silver ingots in composition design, process design, and electronic computer simulation. In order to solve the problems that may occur during the execution of the process before the process starts, to obtain large-scale rings with good performance, quality and service life, and to maximize the potential of metal materials.