A scanning auger microscopy characterization of the internal oxidation produced on carburizing
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Internal oxidation during endothermic gas carburizing was studied in one plain carbon and three alloy steels. The oxide phases formed were analyzed using combined scanning Auger microscopy and thin window energy dispersive x-ray spectroscopy. The work verifies that the morphology of the internal oxides consists of two zones. In the outer zone near the carburized surface (zone 1) particles of Cr-Mn oxides form both within grains and on grain boundaries, and in the deeper zone (zone 2) a Si rich oxide is present exclusively on grain boundaries. Auger depth profiling of the Si rich oxide layer on the grain boundaries in zone 2 shows that it consists primarily of a mixture of SiO2 and Fe2SiO4. Point analysis on polished and sputter cleaned flat sections and depth profiles on fracture surfaces both indicate that the Si rich oxide layers along the grain boundaries are around 120 nm thick.
KeywordsAuger Internal Oxidation Fe2SiO4 United Nations Industrial Development Organization Scanning Auger Microscope
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