Petrochemical forgings, as an important part of the petrochemical industry, its quality and performance have a key impact on the safe operation of the entire system. However, in the manufacturing process of petrochemical forgings, residual stress is often produced, which not only affects its performance, but also may cause safety hazards. Therefore, understanding the residual stress of petrochemical forgings and its elimination methods is of great significance for improving the quality of forgings and ensuring the safety of the system.
Residual stress refers to the self-equilibrium stress in the material without external force. In the manufacturing process of petrochemical forgings, residual stress may occur inside the forgings due to uneven cooling and improper forging process. The existence of residual stress will lead to forging deformation, cracking and other problems, and even lead to forging failure in serious cases.
In order to eliminate residual stress in petrochemical forgings, the following methods can be taken:
Natural aging: The forging is placed in a natural environment for a long time to let it release stress naturally. This method is simple and easy, but it takes a long time, generally months or years to achieve better results.
Artificial aging: Through heating or cooling, accelerate the release of residual stress inside the forging. This method can achieve better results in a short period of time, but the temperature and time of heating or cooling need to be strictly controlled to avoid damage to the forging.
Vibration aging: The use of vibration equipment for forging vibration treatment, so that its internal residual stress is released. This method is effective and easy to operate, but it needs to choose the right vibration frequency and time.
Heat treatment: Through heat treatment processes, such as annealing, normalizing, etc., to eliminate the residual stress inside the forging. This method can eliminate most of the residual stress, but the temperature and time of heat treatment need to be strictly controlled to avoid adverse effects on the structure and performance of the forging.
Ultrasonic impact: The use of ultrasonic shock treatment of forging, so that its internal residual stress is released. This method has the advantages of high efficiency and environmental protection, but it needs to select suitable ultrasonic impact parameters.
The residual stress of petrochemical forgings is an important factor affecting its performance and safety. In order to eliminate the residual stress, natural aging, artificial aging, vibration aging, heat treatment and ultrasonic impact can be adopted. When selecting the elimination method, it is necessary to comprehensively consider the material, shape, size and use conditions of the forging to achieve the best results. At the same time, it is also necessary to strengthen the quality control and process optimization in the manufacturing process to fundamentally reduce the generation of residual stress.
