Mössbauer spectroscopy of laser surfaces treated metallic materials |
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| Authors: | O Schneeweiss K Voleník |
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| Institution: | (1) Institute of Physical Metallurgy, Czechoslovak Academy of Sciences, Zizkova 22, CS-616 62 Brno, Czechoslovakia;(2) State Research Institute for the Protection of Materials, CS-190 11 Praha 9-Bechovice, Czechoslovakia |
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| Abstract: | Laser treated surfaces of the Fe83Si17 alloy and of the coatings prepared on low-carbon steel by laser surface alloying with Ni and Al were investigated by means
of Mossbauer spectroscopy. The short range order in the surface layer after irradiation by neodymium laser pulses was found
to be similar to that before irradiation. The high quenching rate of a single melt pool after single pulse action seems to
be masked by annealing due to the heat produced by successive pulses covering the whole surface. A detailed phase analysis
of the coatings prepared by laser surface alloying was done. Seven different phases were found in dependence on chemical composition
of alloy coatings and on traverse speed, i.e. the speed of relative motion of sample and the continuous CO2-laser beam. |
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