Abstract

In this study, SAE 1020 steel samples were boronized at 850 °C for 4 h with different boronizing mixtures by powder-pack boronizing method. H₃BO₃ or Na₂B₈O₁₃ was used as the boron source, KBF₄ or NaBF₄ was used as the activator and SiC was used as the diluent. Thus, 4 different boronizing mixtures (M1-M4) were prepared. Thickness, morphology and phase structure of the formed boride layers were studied by X-ray diffraction and microstructural analyzes. The single phase (Fe₂B) boride layer with saw-tooth morphology was formed on surface of the samples. The thickest boride layers were obtained by using M1 and M2 boronizing mixtures. Microhardness measurements were performed to determine hardness of the 3 zones (core, transition zone and boride layer). The means of boride layer hardness of the samples were compared according to 95% Confidence Intervals analysis. It was determined that the average hardness value of the boride layers was about 1475 HV. Wear tests were fulfilled by ball on disc type wear test method under dry sliding condition and at 25 °C. According to the friction coefficient and specific wear rate values of boronized samples, it was identified that the sample S_M4 boronized with M4 boronizing mixture has the lowest wear rate (1.64 mm³/N.m) and friction coefficient value (0.63).

Graphic Abstract

中文翻译：

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替代硼化混合物对硼化SAE 1020钢硼化物层和摩擦学行为的影响

摘要

在这项研究中，SAE 1020钢样品通过粉末包装渗硼方法在850°C下用不同的渗硼混合物进行了渗硼4 h。将H ₃ BO ₃或Na ₂ B ₈ O ₁₃用作硼源，将KBF ₄或NaBF ₄用作活化剂，并将SiC用作稀释剂。因此，制备了4种不同的渗硼混合物（M1-M4）。通过X射线衍射和微观结构分析研究了所形成的硼化物层的厚度，形态和相结构。单相（Fe ₂B）在样品的表面上形成具有锯齿形的硼化物层。通过使用M1和M2硼化混合物获得最厚的硼化物层。进行显微硬度测量以确定3个区域（芯，过渡区域和硼化物层）的硬度。根据95％置信区间分析比较样品的硼化物层硬度平均值。确定硼化物层的平均硬度值为约1475HV。磨损试验通过在干式滑动条件下和25°C下使用圆盘式磨损试验方法进行。根据渗硼样品的摩擦系数和比磨损率值，可以确定，用M4渗硼混合物渗硼的样品S _M4的磨损率最低（1.64 mm ³/ Nm）和摩擦系数值（0.63）。

图形摘要