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Tribological properties of Fe(Cr)-B alloys at high temperature

高温条件下Fe(Cr)-B 合金的摩擦学性能

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Abstract

This work is aimed to study the effect of boron on wear resistance of Fe-Cr-B alloys containing different boron contents (0 wt%, 5 wt%, 7 wt% and 9 wt%) from room temperature (RT) to 800 °C in order to explore their applications as high-temperature wear resistant mechanical parts. Additionally, the wear mechanism of alloys is evaluated. The tribological properties of alloys are systematically studied by using a ball-on-disc tribometer at 10 N and 0.20 m/s from RT to 800 °C sliding against Si3N4 ceramic ball. The boron element greatly improves the wear resistance of specimens as compared with that of unreinforced specimen. The friction coefficients of specimens decrease with increasing of testing temperature. The wear rates of Fe-Cr-B alloys decrease firstly and then raise with the increase of boron content. The specific wear rates of specimens with boron are 1/10 of the unreinforced specimen. Fe-21wt%Cr-7wt% B keeps the best tribological properties at high temperature.

摘要

本文研究了在室温至800 °C 范围内硼元素及其含量(0 wt%, 5 wt%, 7 wt%和9 wt%)对Fe-Cr-B 合金抗磨性能的影响,并以此为依据拓宽其作为高温抗磨原件的应用。另外,探讨了合金的高温磨损 机理。在室温到800 °C 范围内,当滑动速度为0.20 m/s 且载荷为10 N 时,以氮化硅陶瓷球作为摩擦 副,采用球-盘式高温摩擦实验机系统研究了试样的高温摩擦学性能。相比于不含硼元素的试样,添 加硼元素试样的抗磨损性能得到了极大的改善。合金的摩擦系数随着测试温度的升高而降低。随着金 属中硼含量的增加Fe-Cr-B 合金的磨损率开始降低,然后开始升高。含硼的铁基合金的磨损率是不含 硼的铁基合金的磨损率的1/10。在高温条件下,Fe-21wt%Cr-7wt%B 合金具有最好的摩擦学性能。

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Correspondence to Gong-jun Cui  (崔功军).

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Foundation item: Projects(51775365, 51405329) supported by the National Natural Science Foundation of China; Project(2015M570239) supported by the China Postdoctoral Science Foundation

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Cui, Gj., Yang, Zw., Wang, Wj. et al. Tribological properties of Fe(Cr)-B alloys at high temperature. J. Cent. South Univ. 26, 2643–2650 (2019). https://doi.org/10.1007/s11771-019-4201-9

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  • DOI: https://doi.org/10.1007/s11771-019-4201-9

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