Hollow forgings need attention in the heat treatment process
In the manufacturing process of hollow forgings, heat treatment is an indispensable part. Heat treatment can improve the internal organization of forgings, improve mechanical properties, and ensure that it can run stably and reliably in complex working environments. However, due to its special structure, hollow forgings need to pay special attention to some problems during heat treatment.First of all, the control of heating temperature is the key in the heat treatment of hollow forgings. Due to the large temperature difference between the inside and outside of hollow forgings, uneven heating may lead to deformation of the forgings or internal stress. Therefore, it is necessary to precisely control the temperature distribution of the heating furnace to ensure that the forging is heated evenly. At the same time, the heating speed also needs to be moderate, too fast or too slow may affect the organization structure and performance of the forging.Secondly, the choice of cooling method has an important impact on the performance of hollow forgings. The cooling rate determines the microstructure transformation and residual stress distribution of forgings. For different materials and performance requirements, different cooling methods are required. For example, for forgings requiring high strength and high toughness, rapid cooling can be used to obtain fine grain structure; For forgings that require better fatigue resistance, slow cooling can be used to reduce residual stress. In addition, the control of holding time is also an important factor in the heat treatment process. The length of holding time will affect the grain growth and microstructure uniformity of forgings. Too long holding time may lead to grain coarsening and reduce the mechanical properties of forgings. However, if the holding time is too short, it may lead to uneven organization and affect the performance stability of forgings. Therefore, it is necessary to reasonably choose…