How do cast parts for heavy trucks meet the requirements of extreme working conditions in terms of heat resistance and fatigue resistance?

Cast parts for heavy trucks must maintain good performance under various extreme working conditions, which requires these parts to have excellent heat resistance and fatigue resistance. In practical applications, especially in environments with high temperatures, vibrations and drastic load changes, the durability of parts directly affects the overall performance and safety of the vehicle. Therefore, the heat resistance and fatigue resistance of cast parts become important considerations in the design and manufacturing process.

Heat resistance is the key to the long-term reliable operation of cast parts for heavy trucks in high temperature environments. Components such as engines, exhaust systems and brake systems generate high temperatures during operation, which requires the component materials to maintain structural stability under high temperature conditions without softening, oxidation or other forms of thermal damage. To this end, manufacturers usually choose high heat-resistant materials such as cast iron, cast steel and high-temperature alloys, which can maintain their mechanical properties at temperatures up to hundreds of degrees Celsius. In addition, adding suitable alloying elements such as chromium, molybdenum, vanadium, etc. to the material can further improve the material's oxidation resistance and high-temperature strength. For example, chromium-containing cast steel can form a dense chromium oxide film at high temperatures to prevent further oxidation, thereby extending the service life of parts.

Fatigue resistance is the ability of cast parts to maintain long-term use without failure when subjected to repeated stress and vibration. Heavy trucks often encounter various road conditions and rapid changes in load during driving, which requires cast parts to withstand continuous fatigue stress without cracking or breaking. During the design process, engineers use tools such as finite element analysis (FEA) to simulate the stress distribution of parts under different working conditions, optimize the design to reduce stress concentration, and thus improve the fatigue resistance of parts. At the same time, in terms of material selection, materials with good fatigue resistance such as high-strength steel and ductile iron are also widely used. These materials improve the fatigue resistance of materials by controlling microstructure and refining grains.