Question: 1. Describe the differences between Rockwell B and Rockwell C hardness tests. 2. Which scale (Rockwell B or C) is used to measure the hardness

1. Describe the differences between Rockwell B and Rockwell C hardness tests.

2. Which scale (Rockwell B or C) is used to measure the hardness of pure Al and non-ferrous alloys?

3. Both tensile strength and hardness are indicators of metal's resistance to plastic deformation. For steels, the tensile strength is roughly proportional to their Brinell hardness number (HB). Based on this information and on the notes provided in class, estimate the tensile strength of steel with 500 HB.

4. When making hardness measurements, what is the effect of making an indentation very close to a pre-existing indentation?

5. Which hardness test can be used to measure the hardness of both metals and ceramic materials?

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