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Abstract
Abstract An investigation was carried out to study the effects of speed, nozzle gap and power input on the case depth of laser transformation hardened ASSAB DF2 (equivalent to AISI 01) tool steel specimens. The specimens, used were 5 and 10 mm thick and 10 and 25 mm in diameter. A defocussed beam from a fast axial flow C02 laser was used with continuous-wave power inputs of 0.4 to 0.6 kW. The traversing speeds used were 5, 10 and 15 mm/s. The nozzle gaps were 5, 10 and 15 mm which gave calculated beam diameters of 0.129, 1.174 and 2.276 mm respectively. It is found that, the case depth increases as either the specimen thickness or power input is increased, but decreases as the: traversing speed is increased. The beam diameter, however, does not seem to have a significant influence on the case depth.
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