paper clip lab by Chris Byron

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Slide Notes

paper clip lab

Published on Nov 18, 2015

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PRESENTATION OUTLINE

Why did the smiths use these techniques?

Photo by cotinis

What does each technique do?

Basically, what happens to the metal when you treat it these ways.

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heat a paper clip to less than orange for a long time

tempering

How did this change the metal? Compare it to the control (baseline).

Photo by Dominique Godbout

heat a paper clip to red

Let it cool very slowly - annealing

How did this change the metal? Compare it to the control (baseline).

Photo by Visualogist

heat another paper clip

Dip it in water - called quenching

How does it behave now?

Photo by Sharon Drummond

heat another

Using a hammer on concrete, hammer it

Hammer it outside.

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Test the stiffness
Don’t forget a control

Now look up the terms.
What do they do?

Why the discrepancy?

Photo by Joanbrebo