Quantitative Microscopy: (ii) manually estimate the grain size and grain boundary surface area per unit volume of a single-phase polycrystal
1. When analyzing a polished and etched metallurgical sample under a microscope, what features are made visible for measuring grain size ?
2. You have drawn five random lines while using the Intercept Method to measure grain size. If the total length of 250 mm on a micrograph and count 100 grain boundary intercepts. If the magnification is 200×, what is the mean intercept length (L) in micrometers (µm) ?
3. Which tool is used in ‘comparison method’ for grain size measurement :
4. A higher ASTM grain size number (n) corresponds to :
5. What is a major disadvantage of the intercept method for measuring grain size ?