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Tempering Lab Report

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Guided Inquiry Laboratory Procedure:
CAN the METTLE of METAL be IMPROVED?

OBJECTIVE:

You will conduct an experiment to investigate the effect of heating, quenching, and tempering on metals and gather evidence to provide an explanation for the phenomenon observed.

QUESTION:

What effect will annealing (strong heating followed by slow cooling), quenching (strong heating followed by quick cooling), or tempering (strong heating followed by quick cooling, then strong heating and slow cooling) have on metals? What do you predict their effect will be on the properties of the metal?

HYPOTHESIS: (Provide your answer to the question above)
____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ …show more content…
Straighten a bobby pin and determine the number of bends to break it in two. Record this on the data chart. Repeat this two more times.

ANNEALING:
1. Heat a bobby pin to red hot by holding it over the flame with the tongs. It must remain red hot for thirty seconds. Then gradually lift it straight up until it is about a foot out of the flame. Let the sample cool gradually in the air for about three minutes. This process of strong heating and slow cooling is called annealing.
2. After it has cooled, bend it back and forth until it breaks and record the number of bends that it takes to break the metal.
3. Repeat this for two more times.

QUENCHING
1. Take a piece of bobby pin and heat it to redness. When it is red hot, immediately place it in a beaker of water. This process of strong heating and quick cooling is called quenching.
2. Bend the pin and record the number of bends needed to break the pin.
3. Repeat this two more times.

TEMPERING
1. Heat a pin to red hot and keep it in the flame for another thirty seconds. Then place it in a beaker of water. Reheat the pin until it glows with a dull redness and remove it gradually from the flame as you did in the annealing process. This process of strong heating, quick cooling, strong heating and then slow cooling is called

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