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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
Tempering
Heat metal
quench in oil
makes it less brittle
case hardening
carbon added to the outer surface of the steel
heat steel
Dip in compound (carbon)
heat again and quench in cold water
