Laser Beam Hardening is a process to increase the wear resistance of the parts and provide longer life. The surface of the work piece is heated to a temperature below the melting point at the rate of approx 1000° per second. Due to the high heating rates, the bulk of the material remains cold. The heat on the surface is transferred to the bulk and surroundings, and the surface microstructure changes, resulting in approx 2 to 3 times harder surface than the basic material hardness. The depth of hardness can be controlled, depending on the size and geometry of the work piece. It is generally in the range of 1 to 2mm depth.
Because of the localised heat input of laser, Only international areas can be hardened without affecting the surrounding areas. This helps in hardening functional areas only. The advantages of laser transformation hardening are as give below.
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