Abstract The powder compact was directly sintered by a pack boriding process to prepare a Fe-based material having a boride layer. The boriding process was carried out at 850 °C, 950 °C and 1050 °C for 3, 5 and 10 h. The morphology of the boride layer was observed by a metallographic microscope, and the thickness of the boride layer was measured. The surface hardness of the boride layer was measured by a Rockwell hardness tester, the phase composition of the boride layer was analyzed by X-ray diffractometer and the friction and wear properties of the sample were tested on the HT-1000 friction and wear tester. The results show that the boride layer was mainly composed of Fe2B single phase, and its thickness was uniform and firmly bonded to the substrate. The thickness and hardness of the layer gradually increased with time and temperature. The binding force between the layer and the substrate would be decreased while the thickness of the layer was too thin or too thick. Boriding at 850 °C and 950 °C resulted with formation of Fe2B phases, while FeB and Fe2B boride phases occurred at 1050 °C. The boride layer has good wear resistance in the friction and wear experiments, the wear mechanism of the boride specimen is mainly the fatigue spalling caused by plastic deformation of microcracks, while the un-bored samples show severe oxidation and plastic deformation.

中文翻译：

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包硼铁基粉末冶金干滑动磨损行为研究

摘要 粉末压块通过包覆硼化工艺直接烧结制备具有硼化物层的铁基材料。硼化过程在 850°C、950°C 和 1050°C 下进行 3、5 和 10 小时。用金相显微镜观察硼化物层的形貌，并测量硼化物层的厚度。硼化物层的表面硬度采用洛氏硬度计测量，硼化物层的相组成采用X射线衍射仪分析，试样的摩擦磨损性能在HT-1000摩擦磨损试验机上进行测试。结果表明，硼化物层主要由Fe2B单相组成，厚度均匀，与基体结合牢固。该层的厚度和硬度随着时间和温度逐渐增加。层的厚度太薄或太厚都会降低层与基材之间的结合力。在 850 °C 和 950 °C 下硼化导致 Fe2B 相的形成，而 FeB 和 Fe2B 硼化物相发生在 1050 °C。硼化物层在摩擦磨损实验中具有良好的耐磨性，硼化物试样的磨损机制主要是微裂纹塑性变形引起的疲劳剥落，而未钻孔的试样则表现出严重的氧化和塑性变形。