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5 types of heat treatment are
1) Normalising
– Steel is heated slow to temperature which internal structure takes place
-Sooked at this temperature
-Cooled slowly in air
2) Annealing
– Similar to normalizing
-Different cooling rate are required for different material
-After heating, soaking, steel is cooled in furnace
-Annealing refines grain structure, reduces hardness, increase ductility
3) Hardening ( Hardness withstand scratching or penetration )
– Steel is heated to specific temperature, followed by rapid cooling
-cooling maybe in air, oil or water
-Gain in hardness but loss in ductility
-Fully hardened is brittle
4) Tempering
– Steel is tempered by heating hardened steel then cool by air or quench
-Temperature which is heated and quench rate control degree of hardness, strength and ductility
-Steel is tempered to achieve certain mechanical properties such as coupling bolt
5) Surface hardening
– Process which structure of surface is charged to give better wear properties
-Increase carbon content – carburizing or heating surfcce of high carbon steel
Carburizing- cyaniding pack method, nitrade gas method.
Heat treatment- flame, induction hardening
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