Три основне методе за мерење величине зрна циљних материјала

Три основне методе за мерење величине зрна циљних материјала

1, comparison method: comparison method does not need to calculate grain, cutting moment. There is a certain deviation (±0.5 grade) in evaluating grain size by comparison with the standard series grading chart. The reproducibility and reproducibility of the evaluated values are usually ±1.
2. Area method: The area method is to calculate the number of grains in a known area and use the number of grains per unit area to determine the number of grain size grades. The accuracy of the method can be ±0.25 by counting the function of grain size. The results of the area method were unbiased and the reproducibility was less than ± 0.5. The key of grain size in the area method is the counting of grain clearly divided by grain interface.

3. Point intercept method: Point intercept is to calculate the point intercept of the intersecting part of the test line segment (or grid) of known length and grain interface, and use the point intercept per unit length to determine the number of grain size. The accuracy of the intercept method is a function of the number of points or intercepts calculated. Accuracy of ±0.25 degree can be achieved through valid statistical results. The measurement results of the intercept method are unbiased, with reproducibility and reproducibility less than ±0.5. For the same precision level, the intercept method is faster than the area method because it does not need to accurately measure the intercept point or intercept number.

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