<正> 铸铁孕育技术的应用已逾六十年,至今对孕育的机理仍不很清楚。争议的焦点在于,究竟是孕育提供了石墨形核的异质基底;抑或激发了石墨自身形核。当前大多数人持前一观点。 以往的工作对孕育铁水中碳分布的实验研究较欠缺。由于对孕育过程中的碳分布图像了解不够,必然影响了对孕育本质的认识。 本文从微观和统计的角度对孕育样品中碳的浓度和活度分布的特点进行了测定,在此基础上探讨了孕育机理。
The "carbon peaks" and high carbon activity spots appear in molten cast ironduring inoculation by Si. No evidence shows that the number of Si-rich particles whichmight be the heterogeneous nuclei of graphite is increased by inoculation. It is suggested thatthe mechanism of inoculation is the undulation of C concentration and activity in an inocu-lated cast iron. The fading of inoculation is caused by the fading of undulation.
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