Internal Porosity Defects in Ductile Cast Irons
Internal Porosity Defects in Ductile Cast Irons
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球墨铸铁的内部孔隙缺陷
DOI：
10.1007/s40962-020-00527-x
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发表时间：
2020
影响因子：
2.6
通讯作者：
K.
中科院分区：
文献类型：
--
作者：
Takemoto;Y.;Mizumoto;M. & Kinno;K.
利用FE-EPMA对2家铸造厂生产的4个铸件内部气孔缺陷进行了细致观察和分析，并对其产生的原因进行了探讨。基于普遍认可的内部疏松可能在凝固后期形成的理论，对实验结果进行了验证。实验结果表明，缺陷内表面双层膜的形成机制及其特征性褶皱或折痕不能用权威理论解释，但基本膜可能起源于液态金属表面并可能被湍流夹带时，这些特征似乎可以解释。碳和FeO在液态金属中形成的固态双膜中的还原反应被认为是球墨铸铁中气孔形核的原因。因此，除了许多研究人员已经开发的工艺变量的控制之外，使用树脂砂和芯的球墨铸铁中的内部孔隙缺陷可以通过避免碳和氧化物膜的夹带来防止。
The internal porosity defects detected in four castings produced in two foundries were carefully observed and analyzed by using FE-EPMA, and then, the root cause of the defects was investigated. Based on the generally authorized theory that the internal porosities might be formed at late stage of the solidification, the experimental results are verified. The formation mechanism of dual layer and its characteristic folds or creases on inner surface of defects shown in the experimental results could not be explained by the authorized theory, but the features seem to be possible to explain when the basic films might originate on the surface of the liquid metal and might be entrained in turbulent flow. The reductive reaction of carbon and FeO in the solid bifilms formed in the liquid metal is considered to contribute the pore nucleation in ductile iron. Therefore, in addition to the control of the process variables already developed by many researchers, the internal porosity defects in ductile cast irons using resin-bonded sand and cores might be prevented by avoiding the entrainment of carbon and oxide films.
影响因子：
2.6
作者：
Campbell, J.
通讯作者：
Campbell, J.
球墨铸铁不同缩松缺陷的微观表征及其与成分和孕育工艺的关系
影响因子：
2.6
作者：
A. Regordosa;N. Llorca
通讯作者：
N. Llorca