Under high temperature environment, the research of fatigue performance of automobile forgings is very important to ensure the safety and stability of vehicles. The working environment at high temperature and the high speed and high load of the vehicle will have a huge thermal stress and thermal fatigue influence on the forging. Therefore, it is necessary to carry out corresponding studies to evaluate the fatigue life and reliability of forgings at high temperatures. The following are some key aspects of fatigue performance research of automotive forgings at high temperatures: Material selection: To study the fatigue performance of automotive forgings at high temperatures, it is necessary to select materials suitable for high temperature working environment. Commonly used high temperature materials include high strength alloy steel and superalloy subjected to heat treatment. These materials have good high-temperature oxidation resistance and high strength characteristics, and can withstand fatigue loads at high temperatures. Thermal fatigue test: By designing and conducting thermal fatigue test at high temperature, the temperature change and load effect under actual working conditions are simulated. In the test, the stress and strain response of forgings are measured and recorded, and the reliability and life of forgings at high temperature are obtained through fatigue life test. Fatigue damage mechanism: It is necessary to understand the fatigue damage mechanism to study the fatigue performance of automobile forgings under high temperature. In the high temperature environment, forgings often occur oxidation, grain growth, phase transformation and other phenomena, these factors will lead to changes in the strength and hardness of the material, thus affecting the fatigue life. Therefore, it is necessary to analyze the microstructure and property changes of materials at high temperatures in order to deeply understand the damage mechanism during fatigue. Simulation and numerical simulation: With the help of numerical simulation and simulation technology, it is possible to simulate the working conditions and fatigue behavior of automotive forgings at high temperatures. The fatigue life and fatigue crack propagation of forgings at high temperature are predicted by establishing appropriate material constitutive model and boundary conditions. Condition monitoring and early warning system: In order to detect the fatigue problem of forging under high temperature in time, condition monitoring and early warning system can be developed. The system can monitor the working parameters such as stress, temperature and vibration of forgings, and predict the fatigue life and potential failure of forgings with real-time data analysis technology. It should be pointed out that when the fatigue performance of automobile forgings under high temperature is studied, a number of factors need to be considered and comprehensively evaluated. This includes material selection, experimental design, numerical modeling, condition monitoring and so on. At the same time, it is also necessary to further improve the design and manufacturing process of forgings in combination with actual conditions of use and vehicle operation to improve the reliability and durability of forgings in high temperature working environments.
