In this study, Hardox 450 and HiTuf steels were boronized by pack-boriding method at 800, 900, and 1000∘C for 5 h. The phases, microstructure, hardness, and wear behavior of boride layers formed on the surface of samples were investigated using XRD, SEM, Micro-Vickers hardness testers, and a pin-on-disc tribotester, respectively. XRD analysis showed that both FeB and Fe₂B phases were formed in the borided area of Hardox 450 steel, but only Fe₂B phase occurred in the boride layer of the HiTuf steel. Micro-Vickers hardness results indicated that the hardness values of the boride layer decreased from the column-shaped structure to towards the matrix in both of Hardox 450 and HiTuf steels. Furthermore, the wear test results showed the coefficients of friction (COF) decreased significantly in the borided samples. The COF of the unborided Hardox 450 steel was reduced considerably from 0.29 to 0.02 by boriding treatment. Similarly, the COF of unborided HiTuf steel was significantly diminished from 0.16 to 0.04 by boriding treatment. In conclusion, the results of this study have indicated that the wear resistance of Hardox 450 and HiTuf steels can be improved by pack-boriding.

中文翻译：

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堆焊对Hardox 450和HiTuf钢的摩擦学行为的影响

在这项研究中，Hardox 450和HiTuf钢在800、900和1000∘C的温度下通过装填硼化方法进行了硼化5 h。分别使用XRD，SEM，Micro-Vickers硬度测试仪和针盘三硼酸酯研究了在样品表面形成的硼化物层的相，显微结构，硬度和磨损行为。X射线衍射分析表明，在Hardox 450钢的硼化区域中同时形成了FeB和Fe ₂ B相，但只有Fe ₂B相发生在HiTuf钢的硼化物层中。Micro-Vickers硬度结果表明，在Hardox 450和HiTuf钢中，硼化物层的硬度值从圆柱状结构降低到基体。此外，磨损测试结果表明，渗硼样品的摩擦系数（COF）显着降低。通过硼化处理，未硼化的Hardox 450钢的COF从​​0.29大大降低到0.02。同样，未经硼化处理的HiTuf钢的COF通过硼化处理也从0.16显着降低至0.04。总而言之，这项研究的结果表明，通过堆焊可以改善Hardox 450和HiTuf钢的耐磨性。