Abstract
Mathematical models for the calculation of temperature, phase transformation, and stresses for progressive laser transforlnation hardening with a toric mirror are presented. The models have been used in calculations for cylinders with two different diameters in which the effects of travel speed, power input, and width of the laser beam were studied. Experiments have been carried out for two low alloy steels with 0.4 and 1.0% C, respectively. Hardness, residual stresses, and the amount of retained austenite have been measured. Further, an initially spheroidized structure seemed unsuitable for laser hardening. Finally, the size of the workpiece should be large enough to allow selfquenching and, thus, formation of martensite. This was found in both the experiments and the calculations.
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