Key Characteristics to Note When Analyzing Material Microstructure with Metallurgical Microscopes
Optical metallographic structure of metallographic microscope is lath like, which is Flat noodles martensitic structure. X-ray diffraction phase analysis and transmission analysis show that there are still
1. The multi-scale nature of material microstructure: atomic and molecular levels, crystal defect levels such as dislocations, grain microstructure levels, microscopic microstructure levels, macroscopic microstructure levels, etc;
2. Uneven microstructure of material microscopes: Actual microstructures often exhibit geometric morphology, chemical composition, and microscopic properties such as microhardness and local electrochemical degree;
3. The directionality of material microstructure, including anisotropy of grain morphology, directionality of low magnification structure, crystallographic preferred orientation, and directionality of macroscopic properties of materials, should be analyzed and characterized separately;
4. The variability of material microstructure: changes in chemical composition, phase transition and tissue evolution caused by external factors and time can all lead to changes in material microstructure. Therefore, in addition to qualitative and quantitative analysis of static microstructure morphology, attention should be paid to whether there is a need to study the solid-state phase transition process, microstructure evolution kinetics and evolution mechanism;
5. The fractal characteristics that may exist in the microstructure of materials and the resolution dependent characteristics that may exist in specific metallographic observations may lead to a strong dependence of quantitative analysis results on image resolution. This is particularly important when quantitatively analyzing the surface morphology of material fracture surfaces and storing and processing digital image files of microstructures;
6. The limitations of non quantitative research on material microstructure: Although qualitative research on microstructure can still meet the needs of materials engineering, material science analysis always requires quantitative determination of the geometric morphology of microstructure and error analysis of the obtained quantitative analysis results.
