Question

matching. match the term on the left with the statement that best describes it on the right.
heating metal till it is red hot and then quick cooling it in water or oil heating metal till it is red hot and then allowing it to cool slowly heating and cooling a metal in a specific way to change the properties heating a metal until it is red hot, quick cooling it in water or oil, then heating it slowly at a controlled temperature and allowing it to come to room temperature slowly

1. quench
2. tempering
3. annealing
4. heat treating

Explanation:

34. quench:

Quenching involves heating a metal to a high temperature (red - hot) and then rapidly cooling it, usually in water or oil. So it matches "heating metal till it is red hot and then quick cooling it in water or oil".

35. tempering:

Tempering is the process of heating a metal (after quenching) to a controlled temperature and then allowing it to cool slowly. So it matches "heating a metal until it is red hot, quick cooling it in water or oil, then heating it slowly at a controlled temperature and allowing it to come to room temperature slowly".

36. annealing:

Annealing is heating a metal to a red - hot temperature and then allowing it to cool slowly. So it matches "heating metal till it is red hot and then allowing it to cool slowly".

37. heat treating:

Heat treating is the general process of heating and cooling a metal in a specific way to change its properties. So it matches "heating and cooling a metal in a specific way to change the properties".

Answer:

1. quench: heating metal till it is red hot and then quick cooling it in water or oil
2. tempering: heating a metal until it is red hot, quick cooling it in water or oil, then heating it slowly at a controlled temperature and allowing it to come to room temperature slowly
3. annealing: heating metal till it is red hot and then allowing it to cool slowly
4. heat treating: heating and cooling a metal in a specific way to change the properties