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Crystallographic characterizations of eutectic and secondary carbides in a Fe-12Cr-2.5Mo-1.5W-3V-1.25C alloy

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Abstract

In this work, the morphology and structures of the eutectic and secondary carbides in a new high chromium Fe-12Cr-2.5Mo-1.5W-3V-1.25C designed for cold-rolling work roll were systematically studied. The precipitated carbides inside the grains and along the grain boundaries were investigated with optical microscope, scanning electron microscopy with energy dispersive spectroscopy, transmission electron microscopy and X-Ray diffraction. Selected area diffraction patterns have been successfully used to identify the crystal formation and lattice constants of the carbides with different alloying elements. The results show that the eutectic carbides precipitated contain MC and M2C distributed along the grain boundaries with dendrite feature. The composition and crystal structure analysis shows that the eutectic MC carbides contain VC and WC with a cubic and hexagonal crystal lattice structures respectively, while the eutectic M2C carbides predominantly contain V2C and Mo2C with orthorhombic and hexagonal crystal lattices respectively. The secondary carbides contain MC, M2C, M7C3 formed along the grain boundaries and their sizes are much larger than the eutectic carbides ones. The secondary M23C6 is much small (0.3-0.5μm) and is distributed dispersively inside the grain. Similar to the eutectic carbides, the secondary carbides also contain VC, WC, V2C, and Mo2C. M7C3 is hexagonal (Fe,Cr)7C3, while M23C6 is indexed to be in a cubic crystal form.

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Authors and Affiliations

  1. State Key Laboratory of Metastable Materials Science & Technology, Yanshan University, Qinhuangdao, 066004, China

    Jing Guo, Ligang Liu, Sha Liu & Qingxiang Yang

  2. College of Metallurgy and Energy, North China University of Science and Technology, Tangshan, 063009, China

    Jing Guo & Yunli Feng

  3. College of Mechanical Engineering, Yanshan University, Qinhuangdao, 066004, China

    Ligang Liu

  4. School of Engineering, Liverpool John Moores University, Liverpool, L3 3AF, UK

    Xuejun Ren

Authors
  1. Jing Guo
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  2. Ligang Liu
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  3. Yunli Feng
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  4. Sha Liu
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  5. Xuejun Ren
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  6. Qingxiang Yang
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Correspondence to Ligang Liu or Qingxiang Yang.

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Guo, J., Liu, L., Feng, Y. et al. Crystallographic characterizations of eutectic and secondary carbides in a Fe-12Cr-2.5Mo-1.5W-3V-1.25C alloy. Met. Mater. Int. 23, 313–319 (2017). https://doi.org/10.1007/s12540-017-6266-z

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  • DOI: https://doi.org/10.1007/s12540-017-6266-z

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