Observation of Microstructures in a Light-Optical Microscope.
1. The role of etching a polished steel sample for microscopic examination is to:
2. Which surface condition is needed for the specimen before etching?
3. After etching, how can grain boundaries be identified under an optical microscope?
4. Which element is the primary alloying addition for copper in brass?
5. How does the microstructure of nodular cast iron compare to that of gray cast iron?