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MICROSTRUCTURE AND OXIDATION RESISTANCE OF Fe–Al–Nb ALLOYED LAYER ON 45 STEEL BY PLASMA SURFACE MODIFICATION

Author

Listed:
  • ZELEI ZHANG

    (College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, P. R. China)

  • ZHENGJUN YAO

    (College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, P. R. China)

Abstract

The Fe–Al–Nb alloyed layer was coated on 45 steel by the plasma niobiumizing modification to improve the microstructure and oxidation resistance of Fe–Al coating prepared by hot-dipping aluminum. The alloyed layer growth followed the typical Volmer–Weber mode with the modification time growing (2–4 h), which was carried out at 1073K and pressure of 40Pa. Its surface morphology was compact without any defects, meanwhile, there was a transition layer between the Fe–Al–Nb alloyed layer and the substrate. The mass increase of Fe–Al–Nb specimen after oxidizing at 873, 973 and 1073K for 100h was less than that of the Fe–Al and untreated 45 steel specimen, it owed to the diffusing fully of the Fe, Al and Nb atoms during high-temperature oxidation, forming a compact protective Nb, Al-rich oxidation film on the surface of the Fe–Al–Nb alloyed layer, and the occurrence of the internal oxidation phenomenon between the loose iron oxides layer and the Fe–Al–Nb alloyed layer at 973K for 100h protected the internal coating from further penetration of oxygen. In addition, the Fe2Nb precipitates and Nb carbides dispersed through the alloyed layer, which were good for improving the strength, creep rupture resistance and inhibiting the Kendal effect at high-temperature.

Suggested Citation

  • Zelei Zhang & Zhengjun Yao, 2017. "MICROSTRUCTURE AND OXIDATION RESISTANCE OF Fe–Al–Nb ALLOYED LAYER ON 45 STEEL BY PLASMA SURFACE MODIFICATION," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 24(03), pages 1-10, April.
  • Handle: RePEc:wsi:srlxxx:v:24:y:2017:i:03:n:s0218625x17500354
    DOI: 10.1142/S0218625X17500354
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