HOMEWORK 3 HEAT TREATMENT

From the instructions and demonstration given in the lesson, plus the information on the handouts, you are asked to answer the following questions.

Question 1. What are the two elements of steel made from? 1…………………….   2……………………..

Question 2. What is the term given to heating a piece of mild steel to bright cherry red and letting it cool down as slowly as possible?

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Question 3. What is the term given to heating the same steel to bright cherry red and letting it cool in still air?

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Question 4. What is the term given to heating silver steel to the same temperature as above and quenching in water?

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Question 5. Why can you not harden mild steel? …………………………………………………………….

Question 6. Tempering high carbon steel replaces the brittleness with what? ……………………………….

Question 7. What temperatures do you usually temper between? …………………………………

Question 8.What is the term given to producing a hard skin on mild steel? …………………………….

Question 9. At what temperature does Austenite appear at? ………………………………………..

Question 10. What is likely to happen to steel if hammered cold? …………………………………………

Question 11. What temperature should screwdrivers be tempered at? ………………………………

Question 12. Casting aluminium alloys have other elements mixed with the aluminium, what are they?

1………………………  2………………………..

Question 13. What is the melting temperature of Aluminium? ………………………

Question 14. What is the melting temperature of mild steel? …………………………

Question 15. What is the melting temperature of silver steel? …………………………

Question 16. What percentage of silver is there in silver steel? ………………………..

Question 17. What temperature would you anneal aluminium at? ………………………..

Question 18. What temperature would you anneal copper at? …………………………

Question 19. Why would you pickle brass or copper after heat treatment? ………………………………….

Question 20. When quenching, how would you help prevent cracking or distortion?

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Name ……………………………………….  Form. ……………………………