Jia Yanhua Zhang Hong Wang Zidong Xue Shouhong Qiao Zhen Zhang Xianheng (Beijing Science and Technology University, Beijing 100083, China;No. 1 Rare Earth Plant, Baotou Iron and Steel Company, Baotou 014010, China)
<正> The difference of nodularizer in phase morphology and service performance by three processes was introduced. The three processes include directly pressing magnesium into molten alloy stirring by nitrogen gas and no stirring from 5 t arc furnace and melting magnesium in the intermediate frequency furnace. The microstructure patterns were observed by scanning electron microscope, and composition of phases was measured by energy dispersive spectrometer method. X-ray diffraction method was used to determine the phase structure of the nodularizer. The results show that spheroidizing reaction time and violent degree of nodularizers are influenced by grain size and distribution uniformity of siliconizing magnesium phase; spheroidizing reaction degree can be mitigated and spheroidizing time be increased by u sing N2 stirring in pressing magnesium from arc furnace.
nodularizer; rare earth magnesium ferrumsilicium alloy; phase structure
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