Microscopic investigation of sensitized Ni-base alloy 600 after laser surface melting
作者： Yun Soo Lim , Jeong Hun Suh , Joung Soo Kim , Il Hyun Kuk
DOI: 10.1007/S11661-997-0288-Y
关键词: Microstructure 、 Materials science 、 Transmission electron microscopy 、 Metallography 、 Carbide 、 Electron diffraction 、 Alloy 、 Dislocation 、 Grain boundary 、 Metallurgy
摘要: A study using a transmission electron microscope (TEM) equipped with an energy-dispersive X-ray spectrometer was carried out to investigate microstructural and compositional changes in sensitized Ni-base Alloy 600, the surface of which had been melted by CO2 laser beam. Cr-rich carbides, having formed along grain boundaries during sensitization treatment, were dissolved completely or partially heat-affected zone (HAZ) close far from laser-melted (LMZ), respectively, accompanied disappearance Cr depletion at boundaries. The microstructure LMZ consisted fine cells grains epitaxially solidified HAZ, concentration observed increase cell LMZ. In addition, walls decorated dislocations, very particles, found be TiN type, distributed randomly tangled dislocations around them. high dislocation density is attributed residual tensile stress developed rapid solidification.
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