Metallographic rating of auto parts
Apr 26, 2023| The automobile is one of the most important means of transportation in modern society. In the manufacturing process of an automobile, parts are an integral part. Auto parts are all the parts used to make up a car, including tires, engine, body, seats, braking system, and so on. With the continuous development of the automobile industry, the performance and quality of auto parts are also put forward higher requirements. Among them, auto parts metallographic rating is one of the important indicators.
Ii. Definition of Metallographic rating
Metallographic rating is a method to comprehensively evaluate the microstructure and properties of metal materials. In the process of auto parts manufacturing, some key parts often need to use high performance metal materials. After metallographic rating, it can judge whether the metal materials of the auto parts meet the requirements, and whether they can meet the performance requirements of the parts.
The main contents of metallographic rating include:
1. Crystal structure and morphology of metal
2. Phase composition and chemical composition of metals
3. Mechanical properties of metal, such as strength, toughness, hardness, etc
4. Heat treatment process and effect of metal
5. Corrosion resistance and wear resistance of metal
6. Microstructure and defects of metals
Three, the significance of metallographic rating
1. Evaluate the quality of the material
The quality of automobile parts is directly related to the safety and reliability of the whole automobile. Metallographic rating can judge whether the material is qualified and meets the design requirements through the evaluation of the material's organization and performance, so as to ensure the quality of auto parts.
2. Improve the reliability of parts
Through the metallographic rating of the material, we can understand the heat treatment, wear resistance, corrosion resistance and other properties of the material, so that we can properly treat the material, improve the performance and reliability of the material, and also provide reference for the design of parts.
3. Save manufacturing costs
Through metallographic rating, the mechanical properties of materials can be understood, which can provide reference for the design of parts and reduce the design and manufacturing costs. At the same time, heat treatment and chemical treatment of materials can improve the performance and reliability of materials, which can also reduce the maintenance and replacement costs of auto parts.
Four, metallographic rating method
Metallographic rating methods mainly include macroscopic metallographic examination and microscopic metallographic examination.
1. Macroscopic metallographic examination
Macroscopic metallographic examination refers to the inspection of defects such as cracks, pores, inclusions and scars in metal materials. Macroscopic metallographic examination can help to check whether the material has defects, as well as the type and extent of defects.
2. Microscopic metallography
Microscopic metallography is the examination of the microstructure of metal materials. Microscopic metallographic inspection is mainly through the microscope observation and analysis of the structure of the material, to understand the material grain size, shape, distribution, mutually sorting, so as to judge the structure and performance of the material.
5. Common metallographic rating standards
1.ISO standard
The ISO standard puts forward a series of requirements for the inspection and evaluation of metal materials, especially the mechanical properties of parts, such as hardness, tensile strength, compressive strength, yield point, elongation and so on.
2.ASTM Standards
ASTM standard is a series of standards for the chemical composition and mechanical properties of metal materials developed by the American Society of Materials, and is also one of the standards widely used in the world.
3.DIN standard
DIN standard is the relevant standard developed by the German Society of Materials, mainly including the heat treatment process and properties of materials, material phase composition and chemical composition, mechanical properties of materials and other aspects of the requirements.
4.JIS standard
JIS standard is formulated by the Japanese Industrial standard, which sets forth a series of requirements on the chemical composition, mechanical properties and heat treatment process of metal materials of automobile parts.
Vi. Conclusion
Metallographic rating of auto parts is very important in auto manufacturing. Metallographic rating can evaluate the quality of materials, improve the reliability of components, and also save manufacturing costs. The commonly used metallographic rating standards include ISO standard, ASTM standard, DIN standard, JIS standard, etc. In the process of auto parts manufacturing, appropriate metallographic rating methods and standards should be selected according to different materials and parts, so as to ensure the quality and performance of auto parts.