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Heat Treatment of Metal - Coggle Diagram
Heat Treatment of Metal
heating and cooling metals to change their properties
Work Hardening
increases strength
but makes more brittle
deforming / hitting - changes the molecular structure
annealing
heating metal up after hardening to make it soft again - less brittle
easier to work with
e.g. Jewellery
case hardening
carbon added to the outside case of steel
Heat steel - red hot
Dip in compound (carbon)
Heat again and then quench in cold water
Tempering
heat metal
quench in oil
makes it less brittle
