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首页> 外文期刊>ISIJ international >Supersaturation of carbon in austenite during carburization by CO gas
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Supersaturation of carbon in austenite during carburization by CO gas

机译：CO气体渗碳过程中奥氏体中碳的过饱和

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Fine particles of electrolytic iron in austenite state absorbed carbon from CO gas to be in supersaturation. The carbon content in austenite was estimated from the spacing of lattice planes of iron, which was measured by a high temperature X-ray diffractometer. The supersaturation was depended on the flow rate of CO gas and temperature. The solute supersaturation ratio of carbon was from 1.2 to 1.8 at the temperature between 1 452 and 1 599 K. Iron particles reduced from hematite by H_2 gas behaved as same as electrolytic iron particles. However, the iron particles reduced from hematite by CO gas were not in supersaturation of carbon and melted at the solubility of carbon in austenite state. The supersaturation can be explained by the decline of heterogeneous nucleation sites per unit volume. The spacing of lattice planes of reduced iron by CO gas abnormally increased and then decreased during heating. The reduced iron particles melted at the solubility of carbon in austenite and did not become supersaturation.
机译：奥氏体状态的电解铁微粒从CO气体中吸收了碳，成为过饱和状态。奥氏体中的碳含量由铁的晶格面的间隔估计，该间隔是通过高温X射线衍射仪测量的。过饱和度取决于一氧化碳气体的流量和温度。碳的溶质过饱和比在1 452和1 599 K之间的温度下为1.2到1.8。通过H_2气体从赤铁矿还原的铁颗粒的行为与电解铁颗粒相同。但是，由CO气体从赤铁矿还原的铁颗粒并未处于碳的过饱和状态，并且在碳的溶解度下以奥氏体状态熔融。可以通过每单位体积异质形核位点的减少来解释过饱和。在加热过程中，CO气体还原的铁的晶格间距异常增大，然后减小。还原的铁颗粒在碳在奥氏体中的溶解度下熔化并且没有变成过饱和。

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