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首页> 外文期刊>Journal of Thermal Analysis and Calorimetry >Examination of the oxidation resistance of Cr–Mo–V tool steel by thermal analysis
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Examination of the oxidation resistance of Cr–Mo–V tool steel by thermal analysis

机译：通过热分析检查Cr–Mo–V工具钢的抗氧化性

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摘要

In the present study, the oxidation behavior of Cr–Mo–V tool steel was examined at different temperatures in air. The examination was conducted by means of thermogravimetric analysis, scanning electron microscopy, and X-ray diffraction (XRD). After non-isothermal oxidation from ambient temperature to 1000 °C, it was revealed that the specimen begins to oxidize over 700 °C, while over 800 °C the oxidation rate increases significantly. Finally over 900 °C, this rate has a considerable value, and the specimen's oxidation resistance is inadequate. From these results, four different oxidation temperatures (805, 835, 865, and 895 °C) were selected for the isothermal test, as referred above, which correspond to different oxidation rates, to determine the oxidation activation energy of the Cr–Mo–V specimens. Energy dispersive X-ray spectroscopy (EDX) and XRD phase identification of the as-formed scales showed that in every case, it contains two distinguishable regions. The inner layer is a mixture of chrome and iron oxides and the outer layer contains iron oxides and is also characterized by high porosity. This phenomenon was explained by the different diffusion coefficients of every element in the steel matrix.
机译：在本研究中，研究了Cr-Mo-V工具钢在空气中不同温度下的氧化行为。通过热重分析，扫描电子显微镜和X射线衍射（XRD）进行检查。从环境温度到1000°C进行非等温氧化后，发现样品在700°C以上开始氧化，而在800°C以上，氧化速率显着提高。最终超过900°C，此速率具有相当大的价值，并且样品的抗氧化性不足。根据这些结果，选择了四种不同的氧化温度（805、835、865和895°C）进行等温测试（如上所述），它们对应于不同的氧化速率，以确定Cr–Mo–的氧化活化能。 V标本。能量色散X射线能谱（EDX）和XRD相鉴定的标度表明，在每种情况下，它都包含两个可区分的区域。内层是铬和氧化铁的混合物，外层包含氧化铁，并且其特征还在于高孔隙率。这种现象可以通过钢基质中每个元素的不同扩散系数来解释。

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