Influence of laser melting treatment on surface composition of Fe–17Cr–13Ni single crystal alloy Part 1 Oxidation during laser treatment

摘要: Abstract The fusion of single crystals Fe–17Cr–13Ni and Fe–17Cr–14·5Ni–2·3Mo (wt-%) using a continuous wave CO2 laser does not induce significant crystallographic reorientation; the orientation remains predominantly (100) with misorientations 3 or 4°. During treatment oxidation can take place, even under helium gas protection. composition in-depth distribution oxidised elements (iron oxides chromium oxide) throughout oxide layer are studied for melted zone non-treated surface, electron spectroscopy chemical analysis (ESCA). two main modifications discussion formation an outer surface enrichment sulphur molybdenum during oxidation. thickness dependent on heat dissipation rate treatment. When energy is slow becomes thicker (up to 35 nm) Cr2O3 observed in region affec...