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Effect of Heating Rate Before Tempering on Reversed Austenite in Fe-9Ni-C Alloy

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Abstract

The alloy was reheated to 580 °C for tempering at rates of 2, 5, 10, 20, and 40 °C/s, respectively, after quenching. The amount, distribution, and stability of reversed austenite were investigated by X-ray diffraction (XRD) and electron back scatter diffraction (EBSD). The microstructure and cryogenic impact energy were studied by scanning electron microscope (SEM), transmission electron microscope (TEM) and Charpy V-notch (CVN) tests. The results showed that when the sample was heated at 10 °C/s, the volume fraction of reversed austenite exhibited maximum of 8%; the reversed austenite was uniform along all kinds of boundaries; the reversed austenite contained higher concentration of carbon which enabled it to be more stable. The cryogenic toughness of the alloy was greatly improved when heated at 10 °C/s, as the fracture surface observation showed that it mainly fractured in ductile rupture mode, which was consistent with the results of cryogenic impact energy.

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Authors and Affiliations

  1. National Engineering Research Center of Advanced Rolling, University of Science and Technology Beijing, Beijing, 100083, China

    Kun Zhang (Doctor Candidate), Di Tang & Hui-bin Wu

Authors
  1. Kun Zhang
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  2. Di Tang
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  3. Hui-bin Wu
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Correspondence to Kun Zhang.

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Zhang, K., Tang, D. & Wu, Hb. Effect of Heating Rate Before Tempering on Reversed Austenite in Fe-9Ni-C Alloy. J. Iron Steel Res. Int. 19, 73–78 (2012). https://doi.org/10.1016/S1006-706X(13)60011-4

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  • DOI: https://doi.org/10.1016/S1006-706X(13)60011-4

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