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A scanning auger microscopy characterization of the internal oxidation produced on carburizing

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Journal of Heat Treating

Abstract

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.

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Authors and Affiliations

  1. Materials Science and Engineering Department and Ames Laboratory, Iowa State University, 50011, Ames, IA

    J. D. Verhoeven & A. J. Bevolo

  2. Zhengzhou Research Institute of Mechanical Engineering, Zhengzhou, Henan, P.R. China

    Nailu Chen

Authors
  1. J. D. Verhoeven
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  2. Nailu Chen
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  3. A. J. Bevolo
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Verhoeven, J.D., Chen, N. & Bevolo, A.J. A scanning auger microscopy characterization of the internal oxidation produced on carburizing. J. Heat Treating 9, 73–80 (1992). https://doi.org/10.1007/BF02833143

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  • DOI: https://doi.org/10.1007/BF02833143

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