首页> 外文期刊>International Journal of Metalcasting: Leading the Transfer of Research and Technology for the Global Metalcasting Industry >The Distribution of Carbon in Austenite Studied on a Water-Quenched Compacted Graphite Iron Using Electron Probe Microanalysis
【24h】

The Distribution of Carbon in Austenite Studied on a Water-Quenched Compacted Graphite Iron Using Electron Probe Microanalysis

机译:奥氏体中碳的分布在使用电子探针微分析的水淬灭浓缩石墨铁上研究

获取原文
获取原文并翻译 | 示例
       

摘要

Spheroidal graphite is the defining microstructural feature of ductile iron and also plays an important role in compacted graphite iron. It is widely accepted that graphite spheroids are engulfed by austenite at an early stage of solidification after which their growth is impeded by the slow diffusion of carbon through a layer of austenite. In this work, a compacted graphite iron-containing spheroidal graphite was studied after interruption of its solidification by water quenching. Selected areas of a cross section of the castings were investigated using quantitative electron probe microanalysis, with emphasis on the distribution of carbon in austenite. The measured carbon concentration near graphite was generally below the theoretical carbon concentration in austenite at equilibrium with graphite at 1140 degrees C. Numerical simulations of diffusion of carbon in austenite around spheroidal graphite suggest that a zone of austenite around graphite was likely depleted of carbon during quenching, possibly explaining the low measured concentrations. The measured carbon concentration near graphite varied by as much as 0.3 wt%, with the lowest concentrations consistently found in the central region of compacted graphite-austenite eutectic cells. Regardless of whether these differences were present prior to quenching or are consequences thereof, they seem to reflect either departures from, or displacements of, the carbon concentration in austenite at equilibrium with graphite. This indicates that there is something about growth of graphite embedded in austenite which is not well understood. Concentrations of Si, Mn and Cu are near equal in the compared regions and do not explain the observed differences in carbon content near graphite.
机译:球形石墨是韧性铁的定义微观结构特征,并在压实石墨铁中起重要作用。众所周度地接受了石墨球状体在凝固的早期阶段被奥氏体吞噬,之后将其生长通过碳的缓慢扩散通过一层奥氏体阻抗。在这项工作中,通过水猝灭中断后,研究了含有压实的石墨含铁的球形石墨。使用定量电子探针微分析研究铸件横截面的选定区域,重点是奥氏体中碳的分布。石墨附近的碳浓度通常低于奥氏体在1140℃的平衡下的理论碳浓度。奥氏体在球形石墨周围的奥氏体扩散的数值模拟表明,淬火过程中奥氏体周围的奥氏体区域可能耗尽碳,可能解释低测量的浓度。图石墨附近的测定的碳浓度变化多达0.3wt%,其在压实石墨沸石共晶细胞的中心区域中始终如一的浓度。无论在淬火之前是否存在这些差异,也似乎反映了奥氏体在具有石墨的平衡的奥氏体中的碳浓度的偏离或位移。这表明嵌入于奥氏体中的石墨的生长并不能很好地理解。在比较区域,Si,Mn和Cu的浓度接近,并且不解释石墨附近的碳含量的观察差异。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号