Marine crankshaft forgings are the key parts of Marine power system. The selection and performance evaluation of crankshaft forgings are of great significance to ensure the normal operation and prolong the service life of the ship. This paper will discuss the material selection principle and performance evaluation method of Marine crankshaft forgings, in order to provide useful reference for enterprises.
Material selection principle
Strength and toughness: Marine crankshaft forgings need to withstand large loads and impact forces, so the material should have high strength and toughness. Commonly used high-strength materials are high carbon steel, alloy steel and so on.
Wear resistance: crankshaft forgings will be subjected to friction and wear during operation, so the material should have good wear resistance. Surface strengthening treatment such as carburizing and nitriding can improve the wear resistance of the material.
Corrosion resistance: The ship’s operating environment is wet, salt spray, etc., so the material should have good corrosion resistance. Commonly used corrosion resistant materials are stainless steel, alloy steel and so on.
Economy: On the premise of meeting the performance requirements, materials with moderate prices and easy procurement should be selected to reduce production costs.
Performance evaluation method
Tensile test: The tensile strength, yield strength and other mechanical properties of the material can be determined by tensile test to evaluate the strength and toughness of the material.
Hardness test: Through the hardness test can determine the hardness level of the material, evaluate the wear resistance of the material and surface strengthening treatment effect.
Impact test: The impact test can determine the fracture toughness of the material under impact load and evaluate the impact resistance of the material.
Corrosion resistance test: The corrosion resistance test can simulate the operating environment of the ship and evaluate the corrosion resistance of the material under conditions such as moisture and salt spray.
Fatigue test: Fatigue test can simulate the fatigue damage of crankshaft forgings during long-term operation and evaluate the anti-fatigue performance of materials.
The material selection and performance evaluation of Marine crankshaft forgings are the key links to ensure the normal operation and extend the service life of the ship. In the process of material selection, the principles of strength and toughness, wear resistance, corrosion resistance and economy should be followed; In the process of performance evaluation, tensile test, hardness test, impact test, corrosion resistance test and fatigue test should be used. Through reasonable material selection and performance evaluation, the quality and reliability of Marine crankshaft forgings can be improved, maintenance costs can be reduced, and economic and social benefits can be brought to enterprises. Therefore, enterprises should pay attention to material selection and performance evaluation work, and constantly improve and optimize relevant technology and management measures to adapt to the changing market environment and enterprise development needs.
