Specific steps for metallographic analysis

Date：2023-05-24 15:43:09Views：375

Metallographic structure analysis is an important quality control method for metal materials, used to evaluate the mechanical properties, process performance, and corrosion performance of metal materials. It is a relatively complex experimental method that requires certain experimental skills and operational experience. Below, this article will introduce the specific operational steps of metallographic structure analysis.

The specific steps for metallographic analysis are as follows:

Sample preparation

Firstly, a representative sample needs to be taken from the metal material to be analyzed, and then sliced, polished, and corroded to obtain a representative metallographic structure sample. When preparing metallographic samples, processing should be carried out according to actual testing requirements and the requirements in standard specifications to ensure that the sample quality meets the requirements.

Metallographic microscope observation

Place the prepared metallographic tissue sample under a metallographic microscope for observation. Metallographic microscope is a commonly used instrument in metallographic structure analysis, which can provide high magnification micrographs to observe and evaluate the crystal structure, phase composition, and grain size of samples. By observing the microstructure of the sample, it is possible to determine whether the metallographic structure of the sample meets the requirements, and further analyze the problems and defects that exist in the sample.

Digital micrograph processing

Obtain digital micrographs of samples using techniques such as digital microscopy or scanning electron microscopy, and perform digital processing and analysis. Digital micrograph processing can perform global and local analysis of samples, such as identifying large grains or small grains at grain boundaries, in order to further analyze information such as grain distribution, grain boundary state, and phase structure of the sample.

Like analysis and calculation

Perform calculations and image analysis through digital micrographs and other relevant data. Among them, common image analysis methods include linear scanning and area scanning. These methods can accurately calculate the grain size, grain boundary length, porosity and other indicators of the sample, and further determine whether the metallographic structure of the sample is qualified.

Data analysis and judgment

Finally, according to the evaluation criteria in the standard specifications, the metallographic structure data of the samples are statistically analyzed. Conduct a comprehensive analysis based on the metallographic structure, grain size, and grain boundary condition of the sample, and determine whether the metallographic structure of the sample meets the testing requirements. If the sample is not qualified, further analysis is needed to identify the problem points and corresponding modification measures need to be taken.

The above is an introduction to metallographic analysis. If you have any needs in this regard, please feel free to consult Chuangxin Testing! Metallographic analysis has a rigorous analysis process and steps, which need to be carried out under the guidance of standard specifications to ensure the accuracy of test results and the quality control of metal materials.