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首页> 外文期刊>Journal of nano research >Nanostructure of Fe-C Alloys Prepared by Arc Melting in Vacuum
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Nanostructure of Fe-C Alloys Prepared by Arc Melting in Vacuum

机译：真空电弧熔炼Fe-C合金的纳米结构

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Three different Fe-C alloys were prepared in vacuum using the arc melting method: hypereutectoid (1.4% C), eutectoid (0.76% C) and hypoeutectoid (0.4% C). Unlike commercial steels, which they always contain Mn and other impurities, our samples were prepared by using high quality powders (99.999 wt.%). The samples were heat-treated and then observed with optical and scanning electronic microscopy (Zeiss EVO MA10). Selected samples were tested by microidentation (microhardness test). After isothermal transformation at 350 degrees C fine bainite nanostructures were observed in the hypoeutectoid sample, the mean size of which was found to be 50 nm. With the eutectoid sample, following different heat treatment procedures different micro-and nano-structures were measured: pearlite lamellar spacing, spheroidized cementite particles, and martensite needles, whose mean size is 145 nm, 290 nm and 200 nm respectively. The nanostructure of hypereutectoid sample after isothermal transformation at 650 degrees C, reveals the eutectoid and proeutectoid cementite lamellas with a mean spacing of 390 nm. X-ray diffraction pattern of eutectoid sample indicated the existence of cementite (Fe3C) content which is also confirmed by carbon mapping of pearlite colonies performed with Energy Dispersive X-ray Spectroscopy. The Vickers hardness of the samples compares well to the one of corresponding commercial steels.
机译：使用电弧熔化法在真空中制备了三种不同的Fe-C合金：超共析物（1.4％C），共析物（0.76％C）和次共析物（0.4％C）。与通常含有锰和其他杂质的商品钢不同，我们的样品是使用高质量粉末（99.999 wt。％）制备的。对样品进行热处理，然后用光学和扫描电子显微镜（Zeiss EVO MA10）观察。所选样品通过显微鉴定（显微硬度测试）进行测试。在350℃下等温转变后，在亚共析样品中观察到细贝氏体纳米结构，发现其平均尺寸为50nm。对于共析样品，按照不同的热处理程序，可以测量到不同的微观和纳米结构：珠光体片层间距，球化渗碳体颗粒和马氏体针，其平均尺寸分​​别为145 nm，290 nm和200 nm。在650摄氏度下等温转变后，超共析样品的纳米结构显示出共析和共析渗碳体薄片，平均间距为390 nm。共析样品的X射线衍射图表明渗碳体（Fe3C）含量的存在，这也通过能量色散X射线光谱法对珠光体菌落的碳谱分析得以证实。样品的维氏硬度与相应的商用钢之一相当。

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