As the core component of hydroelectric power station, the performance and quality of hydropower forgings are of great significance to the operation efficiency and stability of hydroelectric power station. Fatigue life is one of the important indexes to measure the performance of hydropower forgings, which affects the safety and economy of hydroelectric power stations. This paper will introduce the influencing factors and improving methods of fatigue life of hydroelectricity forgings, in order to provide useful reference for improving fatigue life of hydroelectricity forgings.
- Influencing factors
Design factor
The design factor is one of the important factors affecting the fatigue life of hydroelectric forgings. Improper design may lead to problems such as stress concentration and residual stress, which will affect the fatigue life. Therefore, reasonable design is the basis of improving the fatigue life of hydropower forgings.
Material factor
Material is the basis of hydroelectric forgings, its quality, performance and microstructure will affect the fatigue life. For example, the strength, toughness, hardness and other mechanical properties of the material, as well as the metallurgical quality of the material, the content of non-metallic inclusions, microstructure and other factors will affect the fatigue life.
Manufacturing process factor
The manufacturing process has great influence on the fatigue life of hydroelectric forgings. Defects and stress concentration in process such as casting, forging and heat treatment will affect the fatigue life. At the same time, the quality control in the manufacturing process is also the key to improve the fatigue life.
Use factor
Factors during use will also affect the fatigue life of hydroelectric forgings. For example, operating pressure, flow, temperature and other parameters, as well as maintenance conditions, operating environment, etc., will have an impact on the fatigue life of the forging.
Second, improve methods
Optimal design
Optimization design is an important means to improve the fatigue life of hydroelectric forgings. By adopting more reasonable structure design and stress distribution, the stress concentration and residual stress can be reduced, and the fatigue life of forging can be increased. At the same time, various factors in the use process should be considered to prevent possible damage during use.
Select high performance materials
The selection of high performance materials is an important way to improve the fatigue life of hydropower forgings. For example, the selection of high-strength, high-toughness, corrosion-resistant materials can improve the bearing capacity and fatigue resistance of forgings. At the same time, attention should be paid to the machinability and weldability of the material in order to facilitate manufacturing and maintenance.
Adopt advanced manufacturing technology
The fatigue life of hydroelectric forgings can be significantly improved by using advanced manufacturing technology. For example, the use of precision casting or forging technology can reduce the risk of defects and stress concentration; The mechanical properties and fatigue resistance of the material can be improved by the advanced heat treatment process. Using non-destructive testing technology, defects in the manufacturing process can be detected, thereby improving product quality.
Strengthen the use and maintenance
Strengthening the use and maintenance is also an important measure to improve the fatigue life of hydropower forgings. Reasonable operation and use of forgings can avoid problems such as excessive operating pressure and too fast flow rate, so as to reduce damage to forgings. At the same time, regular maintenance should be carried out to check whether there are cracks, corrosion and other problems, and timely treatment to extend the service life of the forging.
- Case analysis
Taking the turbine blades of a hydropower station as an example, the blades are subjected to the impact and wear of the water flow during the working process, which is easy to produce fatigue cracks. In order to improve the fatigue life of the blades, the following measures have been taken: optimize the structure of the blades, select high-strength stainless steel materials, adopt precision casting technology, and strengthen the use of maintenance. After the implementation of these measures, the fatigue life of the blade is significantly increased, and the running state is obviously improved.
Iv. Conclusion
This paper introduces the influencing factors and improving methods of fatigue life of hydroelectric forgings. The influencing factors include design factor, material factor, manufacturing process factor and use factor. In order to improve the fatigue life of hydroelectric forgings, some measures should be taken, such as optimizing design, selecting high-performance materials, adopting advanced manufacturing technology and strengthening operation and maintenance. Through the analysis of examples, we can deepen the understanding and grasp of the methods to improve the fatigue life of hydropower forgings. Improving the fatigue life of hydropower forgings is of great significance to ensure the safety and economy of hydropower stations, so it should be paid great attention to.
