Abstract
The effect of the nitrogen take-up upon irradiation of iron or steel with excimer laser pulses in air or nitrogen atmosphere is well established. The resulting nitrogen depth profiles and phase compositions were measured by a combination of Rutherford backscattering spectrometry, resonant nuclear reaction analysis and conversion electron Mössbauer spectroscopy for various laser parameters. The accuracy of the nitrogen profiling via the 15N(p, xy) 12C reaction allowed the detection of very low nitrogen concentrations and also the resolving of them laterally across the laser spot. The laser-induced changes in surface topography were observed with optical microscopy and surface profilometry. The microhardness across the laser spot and as a function of the depth is compared with the nitrogen depth and lateral profiles and the phase composition. Thus the mechanical properties can be related to the microstructure and phase composition in the laser modified surfaces of iron and steel. A comparison is made between the effects for irradiation of pure iron and the carbon steel C80.
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