Lattice Parameter of Austenite in Silicon Cast Irons

Jacques Lacaze, Marcos G. Lopez, Moukrane Dehmas
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Abstract

Upon solidification, graphitic cast irons undergo a volume change whose amplitude depends on two opposite terms, the contraction associated with austenite formation and the expansion due to graphite crystallization. During cooling after solidification, further precipitation of graphite occurs that continuously changes the physical properties of the material and possibly affects the eutectoid transformation that transforms the matrix from austenitic to ferritic or ferritic-pearlitic. This work intended to study the density of graphitic cast irons at high temperature, i.e., in the temperature range where the matrix is austenitic. High-temperature laboratory X-rays have been carried out on several alloys containing various carbon and silicon contents to characterize the austenite mean lattice parameter. By complementing these results with literature data, a statistical analysis was carried out that expresses the austenite mean lattice parameter as a function of temperature and composition, evidencing the high uncertainty related to the austenite carbon content. Finally, one of the investigated alloys was submitted to a simultaneous dilatometry and X-ray analysis in a synchrotron from room temperature to 1050 °C. The data are used to discuss the austenite lattice parameter prediction and the possibility of density prediction.

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硅铸铁中奥氏体的晶格参数
凝固时,石墨铸铁会发生体积变化,其幅度取决于两个相反的因素:与奥氏体形成有关的收缩和石墨结晶引起的膨胀。在凝固后的冷却过程中,石墨会进一步析出,从而不断改变材料的物理性质,并可能影响共晶转变,使基体从奥氏体转变为铁素体或铁素体-珠光体。这项工作旨在研究高温下(即基体为奥氏体的温度范围内)石墨铸铁的密度。对几种含有不同碳和硅含量的合金进行了高温实验室 X 射线研究,以确定奥氏体平均晶格参数的特征。通过对这些结果与文献数据进行补充,进行了统计分析,将奥氏体平均晶格参数表示为温度和成分的函数,证明了与奥氏体碳含量有关的高度不确定性。最后,在同步加速器中对其中一种研究合金进行了从室温到 1050 ℃ 的同步扩张测量和 X 射线分析。这些数据用于讨论奥氏体晶格参数预测和密度预测的可能性。
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