Petrochemical forging is an important part of petrochemical industry, its quality and performance are of great significance to ensure the safe operation of equipment and extend the service life. As a key process in the heat treatment process, tempering plays an important role in improving the mechanical properties and prolonging the service life of forgings. This paper aims to discuss the influence of tempering process on the properties of petrochemical forgings, in order to provide reference for the research and application in related fields.
Tempering process is a heat treatment process for forgings after quenching, the main purpose of which is to eliminate the residual stress generated during quenching, improve the toughness and plasticity of forgings, while maintaining its strength and hardness. Specifically, the role and significance of the tempering process are mainly reflected in the following aspects:
Elimination of residual stress: During the quenching process, the uneven transformation of the internal and external structure of the forging will lead to the generation of residual stress. These residual stresses will lead to deformation, cracking and other problems during the use of forgings. Through the process of heating and cooling, the residual stress can be released, so as to improve the dimensional stability and service life of the forging.
Improved toughness: forgings after quenching usually have higher hardness and strength, but poor toughness. By decomposing martensite into tempered martensite, tempered trootensite and other structures, tempering process can improve the toughness of forgings and improve their ability to resist impact and fatigue.
Adjust the mechanical properties: By adjusting the tempering temperature and time, you can control the mechanical properties of the forgings, such as strength, hardness, toughness and plasticity. This can meet the needs of forging performance under different working conditions and use requirements.
Influence of tempering process on the properties of petrochemical forgings
Strength and hardness: The tempering process has an important impact on the strength and hardness of forgings. The appropriate tempering temperature and time can make the forging maintain a high strength and hardness, while improving its toughness and plasticity. However, too high tempering temperature or too long tempering time will lead to a decrease in strength and hardness.
Toughness: The tempering process can improve the toughness of forgings and improve their ability to resist impact and fatigue. This is mainly achieved by the decomposition of martensite into tempered martensite, tempered trootensite and other structures with better toughness. Appropriate tempering temperature and time can promote the formation and development of these tissues, thereby improving the toughness of forgings.
Corrosion resistance: Petrochemical equipment usually works in a corrosive environment, so the corrosion resistance of forgings is also an important performance indicator. Proper tempering process can refine the structure and improve the corrosion resistance of forgings. For example, by adjusting the tempering temperature and time, the precipitation and distribution of carbides can be controlled, thereby improving the corrosion resistance of the forgings.
Dimensional stability: The tempering process also has an important impact on the dimensional stability of forgings. By eliminating the residual stress and refining the structure, the deformation and cracking problems that occur during the use of the forging can be reduced, thereby improving its dimensional stability.
The tempering process of petrochemical forgings has an important influence on its properties. Reasonable tempering process can significantly improve the mechanical properties, corrosion resistance and dimensional stability of forgings. Therefore, in the manufacturing process of petrochemical forgings, reasonable tempering process parameters and operating specifications should be formulated according to the specific material, working conditions and use requirements to ensure the best quality and performance of forgings. In the future, with the continuous progress of science and technology and the improvement of green manufacturing requirements, we look forward to more advanced tempering processes and equipment being applied in the manufacturing of petrochemical forgings and providing a strong guarantee for the sustainable development of the petrochemical industry.
