The high temperature strength and thermal stability of copper forgings for agricultural machinery is a research field involving material science and engineering. In this study, the main concern is the mechanical properties and thermal stability of copper forgings under high temperature conditions.
First of all, high temperature strength refers to the maximum load or stress that copper forgings can withstand in a high temperature environment. The research of high temperature strength needs to consider the following aspects:
- Organizational structure: The organizational structure of copper forgings has a great impact on its high temperature strength. Factors such as grain boundary, dislocation and grain size can affect the plasticity and strength of the material. By adjusting the heat treatment parameters and forging process, the grain boundary characteristics and grain size of the material can be optimized, and the high temperature strength of the material can be improved.
- Mechanical properties: Study the stress-strain relationship, yield strength, elongation and other mechanical properties parameters of copper forgings under high temperature conditions. This can be evaluated by tensile tests, compression tests, shear tests, etc. At the same time, it is also necessary to consider the fatigue and creep properties of the material, and whether the material will undergo plastic deformation or damage under long-term use in a high temperature environment and high stress loading.
- Material phase change behavior: Copper forgings may experience phase change under high temperature conditions, such as lattice structure changes, phase changes and precipitation behavior. Studying these phase transition behaviors is very important for understanding the high temperature strength and thermal stability of materials.
Secondly, thermal stability refers to the stability and oxidation resistance of the material under high temperature conditions. Copper forgings are susceptible to oxidation, corrosion and thermal fatigue in high temperature environment, which leads to the degradation of material properties. The following aspects should be considered in the study of thermal stability:
- Oxidation performance: Copper forgings are easy to react with oxygen to produce oxides in a high temperature environment. Studying the oxidation rate, oxidation products and the effect of oxidation on the properties of materials is helpful to improve the oxidation resistance of materials.
- High temperature corrosion: Copper forgings are vulnerable to acid, alkali, water vapor and other corrosive media in high temperature environment. To study the corrosion behavior and corrosion mechanism of materials in different corrosive media, corresponding material protection measures can be taken to improve the corrosion resistance of materials.
- Thermal fatigue: Copper forgings may have thermal fatigue under high temperature conditions, that is, thermal expansion and contraction caused by temperature changes make the material stress. Continuous thermal fatigue can cause cracks inside the material and eventually lead to material failure. Studying the mechanism and influencing factors of thermal fatigue is helpful to improve the thermal stability of materials.
In short, the study of the high temperature strength and thermal stability of agricultural machinery copper forgings needs to consider the structural structure, mechanical properties, phase transition behavior, oxidation, corrosion and thermal fatigue of materials. By studying these aspects, it can guide the material design and process selection of copper forgings for agricultural machinery, and improve its performance and service life under high temperature environment.
