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Surface Modification of EN-C35E Steels by Thermo-Chemical Boronizing Process and its Properties

机译：EN-C35E钢热化学渗硼工艺的表面改性及其性能

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Boronizing, which involves diffusion of boron atoms into steel substrate to form hard iron borides is well known diffusion coating technique, In this study, salt bath boronizing processes were performed on EN-C35E steel substrate in slurry salt bath containing borax, boric acid as boron sources and ferro-silicon as reductant. The process was performed at 850 and 950 ℃ for 2, 4, 6 and 8 hours. Boride layers were examined by optical microscope (OM), scanning electron microscope (SEM) and X-ray diffraction (XRD). Hardness of borides formed on the steel substrate was measured by Knoop indenter under load of 0.5N. Metallographic studies and XRD analysis revealed that single-type Fe_2B layers were formed. Depending on boronizing time and temperature, it has found that the hardness of boride layer ranged from 1895-2143 HK_(0.05) that is nearly 8 times higher than substrate hardness. The thickness of the layer ranged from 25 to 167 μm depending on boronizing time and temperature.
机译：硼化涉及硼原子扩散到钢基底中以形成硬硼化铁，这是众所周知的扩散涂层技术。在这项研究中，在含硼砂，硼酸作为硼的浆料盐浴中对EN-C35E钢基底进行盐浴渗硼工艺。源和硅铁作为还原剂。该过程在850和950℃下进行2、4、6和8小时。通过光学显微镜（OM），扫描电子显微镜（SEM）和X射线衍射（XRD）检查硼化物层。通过努氏压头在0.5N的载荷下测量在钢基材上形成的硼化物的硬度。金相研究和XRD分析表明形成了单一类型的Fe_2B层。根据硼化时间和温度，发现硼化物层的硬度在1895-2143 HK_（0.05）范围内，是基体硬度的近8倍。取决于硼化时间和温度，层的厚度为25至167μm。

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