Abstract
The properties of surfaces can be modified by heat-treatments using a scanning laser beam. In an earlier paper [ Acta metall. 32, 1935 (1984)], we showed that the hardness and the depth of the laser-hardened layer in hypoeutectoid steels could be predicted, with reasonable accuracy, from a model which combined an analysis of heat flow with one of the kinetics of pearlite dissolution, carbon redistribution in austenite, and subsequent transformation to martensite. In the present paper the model is extended to include the case of hypereutectoid steels. A new approximate solution for carbide dissolution is developed, which allows both the changes in particle size and volume fraction, and in carbon content of the austenite, to be estimated. Reasonable agreement between measured and predicted hardness for a laser treated 1% C steel are obtained. The results are presented as laser processing diagrams which show how the case depth and hardness depend on the process variables.
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