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首页> 外文OA文献 >Effect of electric current pulses on the microstructure and niobium carbide precipitates in a ferritic-pearlitic steel at an elevated temperature
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Effect of electric current pulses on the microstructure and niobium carbide precipitates in a ferritic-pearlitic steel at an elevated temperature

机译：高温下电流脉冲对铁素体-珠光体钢组织和碳化铌沉淀的影响

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摘要

Niobium is an important alloying element in steels. In the present work an effort has been made to investigate the effect of electropulsing on the niobium carbide (NbC) at an elevated temperature (800 °C). The results show that the electropulsing treatment can generate an evenly distributed NbC by decreasing the kinetics barriers for precipitation. It has been also found that a semitransformed pearlite structure forms in such a way that the grains are oriented toward a direction parallel to that of the electric current flow. Furthermore, the electropulsed sample benefits from refined grain size. This is thought to be due to the electropulse-enhanced nucleation rate. Tensile testing has been carried out to compare the properties of electropulsed sample with that of without electropulsing. The results show that the sample with treatment has greater yield strength and ultimate tensile stress while its elongation is only 1% less that of the unelectropulsed samples. The improved mechanical properties of the sample with pulsing are attributed to its finer grain sizes as well as the elimination of precipitation free zones caused by the electropulsing treatment.
机译：铌是钢中重要的合金元素。在目前的工作中，已经努力研究在高温（800°C）下电脉冲对碳化铌（NbC）的影响。结果表明，通过减少沉淀的动力学屏障，电脉冲处理可以生成均匀分布的NbC。还已经发现，以使晶粒朝向与电流方向平行的方向取向的方式形成半转变的珠光体结构。此外，电脉冲样品受益于细化的晶粒尺寸。认为这是由于电脉冲增强的成核速率。已经进行了拉伸测试，以比较电脉冲样品和无电脉冲样品的性能。结果表明，经过处理的样品具有更高的屈服强度和极限拉伸应力，而其伸长率仅比未电脉冲的样品低1％。带脉冲的样品机械性能得到改善，这归因于其更细的晶粒尺寸以及消除了由电脉冲处理引起的无沉淀区。

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  • 作者

    Rahnama Alireza; Qin R. S.;

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  • 年度 2015
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  • 正文语种 en
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