During a heat treatment process carbon steel is cooled quickly from a temperature of 900°C - Leaving Cert Engineering - Question 3 - 2018
Question 3
During a heat treatment process carbon steel is cooled quickly from a temperature of 900°C. Name this heat treatment process and state the mechanical property associ... show full transcript
Worked Solution & Example Answer:During a heat treatment process carbon steel is cooled quickly from a temperature of 900°C - Leaving Cert Engineering - Question 3 - 2018
Step 1
Name this heat treatment process and state the mechanical property associated with it.
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Answer
The heat treatment process is called Hardening. The mechanical property associated with hardening is that the material becomes very hard and brittle, making it prone to breaking or shattering easily.
Step 2
Name this heat treatment process and state the mechanical property associated with it.
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Answer
The heat treatment process is called Annealing. The mechanical property associated with annealing is that it makes the material very soft and malleable, allowing it to bend or shape easily.
Step 3
To temper the point of a scriber.
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The point is cleaned and polished with emery paper. It is then heated away from the point to allow the colors to appear and run to the point. When the correct colour, light straw, appears at approximately 250°C to 350°C, the point is quenched in cold water. This process reduces some of the hardness and increases toughness.
Step 4
To case harden the point of a screwdriver.
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Answer
The tip of the screwdriver is heated to approximately 900°C and placed in a carbon-rich environment for a period of time. This will absorb carbon into the steel, allowing it to be hardened by heating and quenching.
Step 5
State two safety precautions to be observed during the heat treatment of metals.
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Answer
Wear protective clothing to protect from hot water splashes or rising steam.
Use tongs or pliers to hold the hot material.
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