Surface Hardening:
Hardened steel is hard throughout its structure. Sometimes we need a very hard surface for wear resistance but at the same time, an inner structure to be quite tough so that the dynamic stresses can be resisted. If we can only surface harden toughened steel, we will get such a structure ca be obtained by:
a) Case hardening
b) Nitriding
c) Flame hardening
d) Induction hardening
e) Carbo-nitriding
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