In the manufacturing process of the flange forgings of petrochemical ring, some residual stress will be generated due to the work hardening, temperature change, stress release and other factors. These residual stresses have an important effect on the service performance and life of parts. Therefore, it is of great significance to analyze and study the residual stress of flange forgings of petrochemical ring parts for improving product quality and reliability. This paper discusses the residual stress analysis of flange forgings of petrochemicals ring.
Residual stress refers to the stress caused by non-uniform deformation, temperature difference, phase transition and other factors during the processing, treatment or loading of the material. These stresses are self-balanced within the parts, but under the action of external factors, such as temperature changes, loading changes, etc., it will induce local stress concentration, deformation, cracking and other phenomena, affecting the service performance and life of the parts.
Analysis method for residual stress of flange forgings of petrochemical ring parts
Experimental methods: The residual stress of the flange forgings of petrochemical ring was measured by X-ray diffraction, neutron diffraction and other non-destructive testing techniques. These methods can obtain more accurate residual stress data, but the experimental cost is high.
Numerical simulation: Using finite element analysis and other numerical simulation methods, the manufacturing process of petrochemical ring flange forgings is simulated to predict the distribution and magnitude of residual stress. This method can save experimental costs, but the accuracy of the results needs to be verified.
Theoretical model: Based on the theoretical models of material mechanics and elastic-plastic mechanics, the formula and model for calculating residual stress are established to predict and evaluate the residual stress distribution and magnitude of the petrochemicals ring flange forgings.
Control measures for residual stress of flange forgings of petrochemical ring parts
Optimize the manufacturing process: By optimizing the manufacturing process of casting, forging, heat treatment, etc., to reduce uneven deformation and temperature differences, thereby reducing the generation of residual stress.
Mechanical relaxation treatment: through mechanical cutting, impact, ultrasonic vibration and other ways to promote the release of the internal stress of the petrochemical ring flange forgings, reduce the level of residual stress.
Heat treatment elimination: through heating and cooling, the phase change of the petrochemical ring flange forgings is eliminated, thereby eliminating the residual stress.
In this paper, the residual stress analysis of flange forgings of petrochemical ring is discussed. Through experimental method, numerical simulation and theoretical model, the generation and influence of residual stress on flange forgings of petrochemical ring can be understood. At the same time, measures such as optimizing manufacturing process, mechanical relaxation treatment and heat treatment elimination can reduce the level of residual stress and improve the quality and reliability of products. It is of great significance to improve the service performance and life of the flange forgings of the petrochemicals ring.
