Effect of Quenching Temperature on Microstructure and Wear Resistant Properties of Mo<sub>2</sub>FeB<sub>2</sub> Cermet Coating
H13 steel, a widely used material in hot work tooling, faces premature failure due to insufficient hardness and wear resistance. To address this limitation, Mo<sub>2</sub>FeB<sub>2</sub> cermet coatings were fabricated on H13 alloy steel via plasma spray welding, and subseque...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-05-01
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| Series: | Lubricants |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4442/13/6/233 |
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| Summary: | H13 steel, a widely used material in hot work tooling, faces premature failure due to insufficient hardness and wear resistance. To address this limitation, Mo<sub>2</sub>FeB<sub>2</sub> cermet coatings were fabricated on H13 alloy steel via plasma spray welding, and subsequently quenched at 850 °C, 1000 °C, and 1150 °C. The effects of the quenching temperature on the microstructure and wear resistance were investigated using optical microscopy (OM) for cross-sectional morphology, scanning electron microscopy (SEM) for microstructural and wear surface analyses, energy-dispersive spectroscopy (EDS) for elemental composition analysis, and X-ray diffraction (XRD) for phase identification. The coating primarily consisted of α-Fe, Mo<sub>2</sub>FeB<sub>2</sub>, (Mo,Fe,Cr)<sub>3</sub>B<sub>2</sub>, and Fe<sub>23</sub>(B,C)<sub>6</sub> phases. Increasing the temperature to 1150 °C increased the Mo<sub>2</sub>FeB<sub>2</sub> hard phase and elevated microhardness by 32.04% (from 827 HV<sub>0.5</sub> to 1092 HV<sub>0.5</sub>). Wear resistance improved by 46.38% (mass loss reduced from 6.9 mg to 3.7 mg). The main wear mechanism was identified as abrasive wear due to the spalling of hard phase particles. These results demonstrate that optimizing quenching temperature enhances the hardness and wear resistance in Mo<sub>2</sub>FeB<sub>2</sub> coatings, offering a viable strategy to extend H13 steel service life in high-temperature industrial applications. |
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| ISSN: | 2075-4442 |