Question

In: Mechanical Engineering

1. Starting with a sample of a fine pearlitic steel, describe the most efficient way to...

1. Starting with a sample of a fine pearlitic steel, describe the most efficient way to form a coarse pearlitic steel.

Answer: …..

2.Now, with this sample of a coarse pearlitic steel, describe the most efficient way to form a tempered martensitic steel.

Answer:…..

3.Now with this sample of a tempered martensitic steel, describe the most efficient way to form a spheroiditic steel.

Answer…..

4.Now with this sample of a spheroiditic steel, describe the most efficient way to return to a fine pearlitic steel (i.e. the steel that you originally started with).

Answer:….

5. What additives to the steel would make it easier to form martensite?

Answer:…

6. In what form should these additives be in so that they are effective?

Answer:….

7. Which one of these steels above would you probably use to make a high quality hand tool and why?

Answer:….

8. Which one of the steels above would you probably use for a low strength application that required a large amount of plastic deformation of the component during manufacture ?

Answer:….

Solutions

Expert Solution

1. Heat the fine pearlitic steel above 723 degree centigrade in order to convert into whole austenitic structure then cool it at furnace temperature i.e. just below 723 degree centigrade (Anealing) in order to get coarse pearlitic steal.

2. Heat the coarse pearlitic steel above 723 degree centigrade in order to convert into whole austenitic structure then cool it rapidly below 220 degree centigrade in order to convert it into 100 % martensite. heat again this sample in the range of 350-500 degree centigrade and cool it to room temperature, to get temperred martensite.

3. Heat the martenstic steel above 723 degree centigradefor sufficient time in order to convert into whole austenitic structure then cool it at furnace temperature to get pearlitic structure. now heat this pearlitic steel at a temperature below the eutectoid for sufficient time i.e. about 700 degree centigrade for between 18 to 24 hours, yield another microstructure called spherodite. this is due to addition carbon diffusion with no change in compostion of ferrite and cementite phases.

4. again heat it above upper critical tempearture and cool it in air (normalising).

5. Sb, P, arsenic and tin as impurities shifts the ductile to brittle transition at higher temperature.

6. As an impurities.

7. tempered martensite as tempering induces core toughness and hard surface provide better wear resistance.

8. Coarse pearlitic steel.

samet mamat answered 2 years ago
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