Thermal power forging is an important component in thermal power generation equipment, its quality and performance directly affect the safety and efficiency of thermal power generation equipment. During the production of thermal power forgings, due to the influence of forging process and heat treatment process, residual stress will occur inside the forgings, which will affect the performance and service life of the forgings. Therefore, residual stress removal technology has become an important research field in the production of thermal power forgings. In this paper, the application scenario and value of residual stress relief technology in thermal power forging production will be discussed.
At present, the residual stress relief technology mainly includes traditional heat treatment and advanced digital treatment methods.
Traditional heat treatment method
The traditional heat treatment method is to change the structure and properties of the material by heating and cooling to achieve the purpose of eliminating residual stress. The traditional heat treatment methods commonly used include annealing, normalizing, tempering, etc. The advantages of these methods are simple process and low cost, but the treatment time is longer, and the treatment effect is affected by factors such as material composition, organization and heating temperature.
Digital processing method
The digital processing method is a method to predict and optimize the residual stress relief process through computer simulation and numerical analysis. Common digital processing methods include finite element method, boundary element method and so on. The advantages of these methods are that they can accurately predict the distribution and magnitude of residual stress, optimize the elimination process, and shorten the processing time, but they require the use of advanced computer equipment and software, and the cost is high.
At present, the research direction of residual stress relief technology is mainly to develop a new type of removal process and equipment, improve the removal efficiency and effect, and reduce the cost. In addition, the research of digital processing method is also a hot direction at present, which can realize the accurate control and optimization of residual stress relief process.
The application of residual stress relief technology in thermal power forging production mainly includes the following aspects:
Residual stress removal during forging
In the forging process, the residual stress will be generated due to the non-uniform deformation and temperature change of the material. The residual stress can be effectively reduced by adopting reasonable process measures such as controlling deformation velocity and temperature gradient during forging. At the same time, heat treatment after forging, such as annealing or normalizing, can also further eliminate residual stress.
Residual stress removal during heat treatment
In the heat treatment process, due to the change of material structure and properties, new residual stress will be generated. The residual stress can be effectively reduced by using reasonable process measures in the heat treatment process, such as controlling the heating speed and cooling speed. At the same time, the residual stress can also be further eliminated by machining or surface treatment after heat treatment.
Residual stress detection and evaluation
In the production process of thermal power forgings, the use of advanced testing equipment and methods, such as X-ray diffraction, ultrasonic method, can accurately detect the distribution and size of residual stress in the forging. Through the analysis and evaluation of the detection results, it can guide the formulation and optimization of the elimination process and improve the elimination efficiency and effect.
By means of literature review and theoretical analysis, the residual stress removal technology in thermal power forging production is deeply studied in this paper. Through the comparison and analysis of the traditional heat treatment method and the digital treatment method, it is found that although the traditional heat treatment method is simple and low cost, the treatment time is longer, and the treatment effect is affected by the material composition, structure and heating temperature. The digital processing method can accurately predict the distribution and size of residual stress, optimize the elimination process, and shorten the processing time, but it requires the use of advanced computer equipment and software, and the cost is high. Therefore, in practical application, it is necessary to choose the appropriate elimination method according to the specific situation. At the same time, it is also found that some problems exist in the current residual stress removal technology, such as low removal efficiency and unstable treatment effect, which need to be further studied and improved. Future research directions can include developing new elimination processes and equipment, improving elimination efficiency and effectiveness, and reducing costs.
