Abstract
The effect of laser surface melting (LSM) on the microscopic morphology of a complex high alloy steel has been examined in single track experiments. Different combinations of power (1–4kW) and scan speed (500–1000mmmin−1) were selected in order to obtain a range of depths of melt penetration. An increase in the depth of melt penetration has correlated with rise in the estimated surface temperature induced by laser melting. Within the strongly refined structure of the laser melted alloy, the interdendritic spacing, λ varied from 0.29μm to 0.97μm with increase in the depth of melt penetration. The microhardness in the laser surface melted region has been shown to decrease linearly with λ−0.5.
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