Abstract
Nodular iron of martensitic structure was treated by means of a XeCl laser prototype. The energy density varied from 0.3 to 5 J/cm2 and the number of shots from 4 to 40. Conversion electron Mössbauer spectroscopy, conversion X-ray Mössbauer spectroscopy and grazing incidence X-ray diffraction were used to characterize the irradiated surface. Some Rutherford backscattering spectrometry measurements were performed to control surface oxidation and carbon distribution. It is shown that after irradiation austenite formed in a rather deep heat affected zone (10–20 μm) compared to the thickness of the melted zone (∼ 1 μm). The austenite amount as well as its carbon content increase with energy density and number of shots up to a threshold of carbide formation. Beyond the threshold Fe2C, Fe3C and Fe5C2 formed only in the melted zone. The carbon content as a function of depth is constant in the melted layer, then decreases quickly from the melted layer-heat affected zone interface down its initial value. The carbon content is shown to govern the evolution of phases content in the melted layer depending on the laser treatment conditions.
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Marest, G., Fontes, A., Roigt, J. et al. Microstructure of nodular cast iron after excimer laser surface processing. Hyperfine Interact 95, 227–245 (1995). https://doi.org/10.1007/BF02146316
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DOI: https://doi.org/10.1007/BF02146316