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Laser beam hardening is a Case hardening process in which the outer surface (typically 0.1mm to 1.5mm), which is exclusively used with ferrous materials suitable for quenching.
The moving laser beam will heat a small portion of the material where it is focused just below the melting point which will be cooled rapidly once the laser beam moves away. Due to the low temperatures of the surrounding material, the heated area is rapidly cooled, thereby changing its structure to very hard martensite.
Laser beam hardening machines are recommended to work with vacuum pressure where as electron beam hardening machines which has the same hardening principle, require vacuum pressure.