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Effect Of Boron Content On High-Temperature Oxidation Resistance Of B-Bearing High-Speed Steel

Author

Listed:
  • YINGHUA LIN

    (School of Mechanical and Electrical Engineering, Putian University, Fujiang Province, Putian 351100, P. R. China)

  • HUI LI

    (#x2020;School of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, P. R. China)

  • JIANG JU

    (#x2020;School of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, P. R. China)

  • CHANGCHUN JIANG

    (School of Mechanical and Electrical Engineering, Putian University, Fujiang Province, Putian 351100, P. R. China)

  • YONGPING LEI

    (School of Mechanical and Electrical Engineering, Putian University, Fujiang Province, Putian 351100, P. R. China†School of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, P. R. China)

  • HANGUANG FU

    (#x2020;School of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, P. R. China)

Abstract

The oxidation behavior of B-bearing high-speed steel was studied at 923K. The results showed that the as-cast microstructure of 1.0 wt.%B high-speed steel was composed of pearlite + ferrite + M7(C, B)3 + M2(B, C). When the boron content increased, the microstructure gradually changed into martensite + retained austenite + netlike M2(B, C) + M23(C, B)6 + M7(C, B)3. The cyclic oxidation of B-bearing high-speed steel at K followed parabolic rule. The unit area mass gain of 1 wt.%B high-speed steel was 4.2 g/m2 after 923 K/250 h oxidation, and the unit area mass gain of 3 wt.%B high-speed steel was only 3.5 g/m2. The oxidation of boron element formed B2O3, which was mainly enriched at the interface of the oxide film/matrix. B2O3 flowed in the oxide film at high temperature and was easy to fill the defect. B2O3 was easy to form B2O3-SiO2 borosilicate with SiO2. The more boron content was, the more favorable it was to form B2O3-SiO2 borosilicate oxide layer rich in B2O3 and the more favorable it was to spread in the oxide film, so that the oxidation resistance of B-bearing high-speed steel could be remarkably improved.

Suggested Citation

  • Yinghua Lin & Hui Li & Jiang Ju & Changchun Jiang & Yongping Lei & Hanguang Fu, 2020. "Effect Of Boron Content On High-Temperature Oxidation Resistance Of B-Bearing High-Speed Steel," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 27(12), pages 1-15, December.
    • Handle: RePEc:wsi:srlxxx:v:27:y:2020:i:12:n:s0218625x20500237
    DOI: 10.1142/S0218625X20500237
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