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Precipitation of austenite particles at grain boundaries during aging of Fe-Mn-Ni steel

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Abstract

Precipitation of austenite particles at grain and lath boundaries after aging treatment of a Fe-8Mn-7Ni alloy was investigated by selected area electron diffraction (SAD), X-ray energy dispersive spectrometry (EDS) in a scanning transmission electron microscope (STEM), and high-resolution (HRTEM) analysis. High spatial-resolution (2 to 5 nm) EDS analysis revealed no significant segregation of alloying elements at grain boundaries but the precipitation of very fine particles of Mn- and Ni-rich phase. Detailed EDS, SAD, and HRTEM analyses all confirmed that these particles are austenite phase, which have a Kurdjumov-Sachs (K-S) orientation relationship with one of the adjacent grain. The concentration of Mn and Ni in austenite, measured by EDS, varied from ∼15 pct to a maximum of ∼30 pct. Low-voltage scanning electron microscopy (SEM) fractographs also revealed the presence of very fine, second-phase precipitates on the fracture surface of the embrittled alloys.

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Authors and Affiliations

  1. the Research Center, KISTAR Co. Ltd., 405-817, Incheon, Korea

    Seung-Ho Mun (Chief)

  2. the Department of Materials Science, Lehigh University, 18015, Bethlehem, PA

    Masashi Watanabe (Research Scientist) & David B. Williams (Professor)

  3. the Graduate Department of Jiamusi University, 154007, Heilongkiang Province, People’s Republic of China

    Xingyi Li (Professor)

  4. the School of Materials Science and Engineering, Seoul National University, 151-742, Seoul, Korea

    Kyu Hwan Oh (Associate Professor) & Hu-Chul Lee (Professor)

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  1. Seung-Ho Mun
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  2. Masashi Watanabe
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  3. David B. Williams
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  4. Xingyi Li
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  5. Kyu Hwan Oh
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  6. Hu-Chul Lee
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Mun, SH., Watanabe, M., Williams, D.B. et al. Precipitation of austenite particles at grain boundaries during aging of Fe-Mn-Ni steel. Metall Mater Trans A 33, 1057–1067 (2002). https://doi.org/10.1007/s11661-002-0207-1

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  • DOI: https://doi.org/10.1007/s11661-002-0207-1

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