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稀土与镁含量对蠕墨铸铁凝固过程及石墨形态的影响
Effect of Rare Earth and Magnesium Contents on the Solidification Process and Graphite Morphology of Compacted Graphite Cast Iron
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- DOI:
- 作者:
- 郝博魁 1 ，邓小洲 1 ，蔡启舟 2 ，肖凤赞 1 ，郑卫星 1 , 田韵森 1 ，陈 哲 2
HAO Bokui 1 , DENG Xiaozhou 1 , CAI Qizhou 2 , XIAO Fengzan 1 , ZHENG Weixing 1 , TIAN Yunsen 1 , CH
- 作者单位:
- HAO Bokui 1 , DENG Xiaozhou 1 , CAI Qizhou 2 , XIAO Fengzan 1 , ZHENG Weixing 1 , TIAN Yunsen 1 , CHEN Zhe 2
1. Yichang Marine Diesel Engine Co., Ltd., Yichang 443002, China; 2. State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, China
- 关键词:
- 蠕墨铸铁；冷却曲线；凝固过程；共晶再辉；石墨形态
compacted graphite cast iron; cooling curve; solidification process; eutectic recalescence; graphite morphology
- 摘要:
- 采用热分析技术和微观组织分析， 研究了蠕化元素 RE 和 Mg 含量对蠕墨铸铁凝固过程和石墨形态的影
响。 结果表明，铁液经 RE 与 Mg 蠕化处理后，共晶点右移，初晶温度升高， 0.019％~0.023%RE 和 0.006％~0.011%Mg 使
初晶温度由原铁液的 1 152.7 ℃ 上升至 1 163.2~ 1 166.6 ℃ 。 共晶凝固再辉温度 ΔT R 与石墨形态具有确定的对应关系，
随着 ΔT R 增加，蠕化率升高，当再辉温度高于 5 ℃ ，蠕化率大于 50% 。提高 RE/Mg 比，有利于获得高蠕化率， RE/Mg 比增
加后，采用高效孕育剂，可抑制蠕化铁液的白口倾向。
The effect of vermicular element RE and Mg content on the solidification process and morphology of vermicular
graphite was studied by thermal analysis and microstructure characterization. The results show that the eutectic point moves
to right and the primary crystallization temperature increases after vermicularization treatment by Re and Mg alloy, and
0.019%~0.023% RE and 0.006%~0.011%Mg increase the primary crystallization temperature from 1 152.7 ℃to 1 163.2~
1 166.6 ℃.There is a definite relationship between the eutectic recalescence temperature ΔT R and morphology of graphite.
With the increase of ΔT R , the vermicular rate increases. When recalescence temperature is higher than 5 ℃, the vermicular
rate is more than 50%. In crease Re/Mg ratio is beneficial to obtain high vermicular rate, and the chill tendency can be
inhibited by using high efficiency inoculants when RE/Mg ratio is increased.