Usually, when conducting metallographic sampling, the logic of the operation can be as follows.


Firstly, if there are regulations such as technical standards, protocols, work instructions, etc., sampling and sample preparation should be carried out in accordance with the specified requirements.


Secondly, attention should be paid to the sampling site, and representative sites must be selected.


Thirdly, attention should be paid to sampling methods. To avoid overheating, overcooling, deformation, cracking, and so on. In summary, it is important to avoid changes in the sample due to the sampling process. Of course, sampling itself is not easy, and to some extent, it will definitely not avoid some impacts. So what should we do? Very simple, we can remove the affected areas or avoid them in the subsequent sample preparation process. Whenever possible, experiments must be conducted in areas that are not affected by the sampling process.


Fourthly, for some deeply processed samples, it is important to take both horizontal and vertical samples. For long, processed materials, separate samples should be taken at both ends.


Fifth, when conducting specific studies, sampling locations should be selected based on the research purpose.


Sixth, for the purpose of failure analysis, sampling is generally required for both the failed and normal parts.


Seventh, both the original sample and the sample taken need to be properly sized.


Eighth, it is also important to be careful not to cause secondary effects on the sample during sample preparation.


The above can be used as a sampling reference for general material experiments, and only for communication and learning purposes in other fields.


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