Physical Metallurgy Lab Viva

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Physical Metallurgy Lab Viva
10 X 2 = 20 Marks
1. Why is it necessary to wash specimens thoroughly between each stage of the
process during grinding ?

2. What is the etching reagent used for mild steel samples?

3. What is the etching reagent used for cast iron samples?

4. What is the etching reagent used for copper samples?

5. What are the mesh sizes of the abrasive paper you used for hand grinding?

6. Why do you use coarse mesh sizes followed by finer mesh sizes for hand
grinding?

7. In the figure below why do you change sample orientation (or grinding
direction) by 90
O
when you go from 240 grit to 320 grit?


8. Why is it necessary to wash the specimen after polishing?

9. What are abrasives used for polishing?

10. What is the grit size in microns of the polishing paste you used?

11. Why do you use polishing cloth?

12. What are the polishing cloths used in the lab?

13. Why should we not use excessive force or press the specimen too hard against
the polishing wheel?

14. Why should we rotate the specimen against the rotation direction of the
polishing wheel?

15. what is the purpose of etching?

16. Why do you use cooling media in abrasive cutting machines?

17. Why do you use mounting in sample preparation?

18. What are the two main types of mounting techniques. Explain briefly?

19. Write about the following measurements in Quantitative Image Analysis
software used
(a) Count (b) Density

20. Write about the following measurements in Quantitative Image Analysis
software used
(a) Particle (b) Phase Segmentation

21. Write about the following measurements in Quantitative Image Analysis
software used
(a) Counting Thickness (b) Inclusion

22. Write about the following measurements in Quantitative Image Analysis
software used
(a) Porosity (b) Flake

23. Write about the following measurements in Quantitative Image Analysis
software used
(a) Nodularity (b) Grain Measurement.

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