Laser nitriding of metals

摘要: Abstract Laser nitriding can be described as the irradiation of metal surfaces by short laser pulses in nitrogen containing atmospheres. This may lead to a strong take-up into and nitride formation which improve metal’s surface properties, e.g. hardness or corrosion wear resistance. Here, iron, carbon steel, stainless aluminum was investigated employing combination complementary methods. Ion beam analysis (Rutherford Backscattering Spectroscopy Resonant Nuclear Reaction Analysis) employed for element isotope profiling. Mossbauer spectroscopy X-ray diffraction were used phase analysis. Surface profilometry, optical electron microscopy revealed topography morphology obtained after nitriding. Microhardness measurements nanoindentation technique characterized mechanical properties treatment. By this methods it became possible resolve influence treatment parameters (laser fluence, number pulses, spot size, spatial intensity distribution, gas pressure) different materials treated (iron, steels steel). It is shown that complex process, composed several superimposed effects. heating, melting evaporation with plasma generation laser-supported absorption waves are essentials process. Pressure- plasma-enhanced dissolution diffusion macroscopic material transport (piston effect, convection, fall-out) further important effects determining results. Additional marker experiments treatments isotopically enriched atmospheres allowed analyze these develop scenarios process mechanisms. A simulation depth profiles single irradiations derived, whose results good agreement experimentally observed profiles.