Thermal power forging is an important component in thermal power generation equipment, its performance and quality directly affect the safety and efficiency of equipment operation. In order to improve the wear resistance, corrosion resistance and fatigue strength of thermal power forgings, surface strengthening technology has become an important research and application field. From the perspective of surface strengthening technology, this paper will discuss its application scenarios and development trends in thermal power forging manufacturing.
Surface strengthening technology refers to changing the organizational structure, chemical composition or stress state of the material surface through physical, chemical or mechanical methods to improve the performance of the material surface. Common surface strengthening techniques include the following:
Thermal spraying technology: The spraying material is melted and sprayed onto the workpiece surface at high temperature to form a coating with wear-resistant and corrosion-resistant properties.
Laser surface strengthening technology: Using the high energy density of the laser beam, the surface of the workpiece is quickly melted and solidified to form a modified layer with fine grains, high hardness and other properties.
Ion implantation technology: The ion beam is accelerated to a high energy state, injected into the workpiece surface to a certain depth, change the surface chemical composition and organizational structure, and improve the surface hardness and wear resistance.
Surface mechanical grinding technology: Through the mechanical grinding method, the workpiece surface produces plastic deformation and hardening, improve the surface hardness and wear resistance.
In the manufacture of thermal power forgings, the common surface strengthening technologies are thermal spraying technology and laser surface strengthening technology. This paper will introduce the research status and application of these two technologies.
Research on thermal spraying technology
Thermal spraying technology is a common surface strengthening technology, which has the advantages of simple process, adjustable coating thickness and wide application range. In the manufacture of thermal power forgings, thermal spraying technology is mainly used to improve the wear resistance and corrosion resistance of forgings. The microstructure and properties of thermal spraying coatings were studied by selecting different spraying materials and process parameters. For example, the WC-Co coating prepared by high-speed flame spraying technology has excellent wear resistance and corrosion resistance, which can effectively extend the service life of thermal power forgings.
Research on laser surface strengthening technology
Laser surface strengthening technology is a new type of surface strengthening technology, which has the advantages of high machining precision, small heat affected zone and excellent performance of modified layer. In the manufacture of thermal power forgings, laser surface strengthening technology is mainly used to improve the fatigue strength and wear resistance of forgings. By using different laser parameters and process conditions, the microstructure and properties of the laser surface enhanced modified layer were studied. For example, the NiCrBSi coating prepared by pulsed laser cladding technology has excellent wear resistance and fatigue strength, which can effectively improve the performance of thermal power forgings.
Surface strengthening technology has been widely used in thermal power forging manufacturing, and its main application scenarios include the following aspects:
Improve wear resistance: By thermal spraying or laser surface strengthening technology, a layer of coating or modified layer with excellent wear resistance is prepared on the surface of thermal power forgings, which can effectively extend the service life of the forgings.
Improve corrosion resistance: The corrosion resistant coating prepared by thermal spraying technology can form a dense protective layer on the surface of thermal power forgings, effectively preventing the corrosion of corrosive media on the forgings.
Improve fatigue strength: The modified layer prepared by laser surface strengthening technology can significantly improve the fatigue strength of thermal power forgings and effectively prevent the generation and expansion of fatigue cracks.
Local repair: For worn or damaged thermal forgings, thermal spraying or laser surface strengthening technology can be used for local repair to restore its performance and extend its service life.
This paper introduces the research and application of surface strengthening technology in manufacturing thermal power forgings. Through the in-depth research and application of thermal spraying technology and laser surface strengthening technology, it can effectively improve the wear resistance, corrosion resistance and fatigue strength of thermal power forgings, extend its service life and reduce maintenance costs. With the continuous development and innovation of science and technology, surface strengthening technology will play an increasingly important role in thermal power forging manufacturing, providing strong support for the realization of efficient, high-quality and low-carbon thermal power forging manufacturing.
