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首页> 外文期刊>Revista de metalurgia >Efecto del contenido de aluminio sobre la temperatura de transformación austenita-ferrita en aceros de bajo carbono (Al-Si) eléctricos de grano no-orientado laminados en caliente
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Efecto del contenido de aluminio sobre la temperatura de transformación austenita-ferrita en aceros de bajo carbono (Al-Si) eléctricos de grano no-orientado laminados en caliente

机译：铝含量对热轧非晶粒取向电工低碳钢（Al-Si）中奥氏体-铁素体转变温度的影响

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The aim of the present study is to investigate the synergistic effect of silicon and aluminum content on the austeniteferrite transformation temperatures on cooling (Ar3, Ar1) in non-oriented (GNO) Al-Si-low carbon electrical steel strips. Two specimens with different Al contents: A=0.22 wt% and B=0.61 wt%Al, were analyzed by “in-situ” high temperature X-ray diffraction experiments. The samples were austenitized at 1050 °C for 5 minutes and sequentially cooling in a stepwise manner by steps of 10 °C inside an environmental chamber installed in a Philips X’Pert multi-purpose diffractometer. X-ray diffraction patterns were recorded every 10 °C during cooling from 1000 to 720 °C. The austenite to ferrite transformation temperatures on cooling, Ar3 and Ar1, were estimated from changes in the intensities of the (110)-α and (111)-γ peaks as a function of temperature. The results of the experiments show that the transformation temperatures increase with increasing aluminum content from 0.22 to 0.61 wt%. In addition, the two-phase field (austenite + ferrite in the system Fe-C decreases with increasing silicon and aluminum contents for these GNO steels. X-Ray diffraction results were supported by microstructural observations of quenched samples of steel B which were subjected to similar heat treatment conditions than those applied in the X-ray diffractometer experiments. Thin ferrite films (~ 4-10 μm) were observed in the microstructure of specimens of steel B quenched from temperatures close to the experimental Ar3.
机译：本研究的目的是研究硅和铝含量对无取向（GNO）Al-Si-低碳电工钢的冷却（Ar3，Ar1）时奥氏体铁素体转变温度的协同作用。通过“原位”高温X射线衍射实验分析了两个Al含量不同的样品：A = 0.22 wt％和B = 0.61 wt％Al。将样品在1050°C的温度下奥氏体化5分钟，然后在Philips X'Pert多功能衍射仪中安装的环境室内以10°C的温度逐步冷却。在从1000到720°C的冷却过程中，每10°C记录一次X射线衍射图。根据（110）-α和（111）-γ峰强度随温度的变化估算冷却时奥氏体到铁素体的转变温度Ar3和Ar1。实验结果表明，转变温度随铝含量从0.22 wt％增加到0.61 wt％而增加。另外，这些GNO钢的两相场（Fe-C系统中的奥氏体+铁素体）随着硅和铝含量的增加而减小，X射线衍射结果得到了B钢淬火样品的显微组织观察的支持。与X射线衍射仪实验所采用的热处理条件相似;在接近Ar3的温度下淬火的B钢试样的显微组织中观察到了薄的铁素体薄膜（〜4-10μm）。

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