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EFFECT OF HEAT TREATMENT ON (Cr, Fe)7C3/γ-Fe COATINGS IN SITU SYNTHESIZED BY VACUUM ELECTRON BEAM IRRADIATION

Author

Listed:
  • BINFENG LU

    (School of Mechanical Engineering, Shanghai Dianji University, Shanghai 201306, P. R. China)

  • YUNXIA CHEN

    (School of Mechanical Engineering, Shanghai Dianji University, Shanghai 201306, P. R. China)

  • MENGJIA XU

    (School of Mechanical Engineering, Shanghai Dianji University, Shanghai 201306, P. R. China)

Abstract

(Cr, Fe)7C3/γ-Fe composite layer has been in situ synthesized on a low carbon steel surface by vacuum electron beam VEB irradiation. The synthesized samples were then subdued to different heat treatments to improve their impaired impact toughness. The microstructure, impact toughness and wear resistance of the heat-treated samples were studied by means of optical microscope (OM), X-ray diffraction (XRD), scanning electron microscope (SEM), microhardness tester, impact test machine and tribological tester. After heat treatment, the primary and eutectic carbides remained in their original shape and size, and a large number of secondary carbides precipitated in the iron matrix. Since the Widmanstatten ferrite in the heat affected zone (HAZ) transformed to fine ferrite completely, the impact toughness of the heat-treated samples increased significantly. The microhardness of the heat-treated samples decreased slightly due to the decreased chromium content in the iron matrix. The wear resistance of 1000∘C and 900∘C heat-treated samples was almost same with the as-synthesized sample. While the wear resistance of the 800∘C heat-treated one decreased slightly because part of the austenite matrix had transformed to ferrite matrix, which reduced the bonding of carbides particulates.

Suggested Citation

  • Binfeng Lu & Yunxia Chen & Mengjia Xu, 2017. "EFFECT OF HEAT TREATMENT ON (Cr, Fe)7C3/γ-Fe COATINGS IN SITU SYNTHESIZED BY VACUUM ELECTRON BEAM IRRADIATION," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 24(Supp02), pages 1-9, November.
    • Handle: RePEc:wsi:srlxxx:v:24:y:2017:i:supp02:n:s0218625x18500282
    DOI: 10.1142/S0218625X18500282
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