EFFECT OF BORON CONTENT ON HIGH-TEMPERATURE OXIDATION RESISTANCE OF B-BEARING HIGH-SPEED STEEL

Yinghua Lin, Hui Li, Jiang Ju, Changchun Jiang, Yongping Lei and Hanguang Fu
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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

Surface Review and Letters (SRL), 2020, vol. 27, issue 12, 1-15

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.

Keywords: Boron content; B-bearing high-speed steel; microstructure; borocarbide; high temperature oxidation resistance (search for similar items in EconPapers)
Date: 2020
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DOI: 10.1142/S0218625X20500237

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