| Nb对灰铸铁相变温度的影响 |
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| 引用本文： | 闫永生,孙小亮,朱洪波,华勤,翟启杰.Nb对灰铸铁相变温度的影响[J].现代铸铁,2011(2):42-44. |
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| 作者姓名： | 闫永生 孙小亮 朱洪波 华勤 翟启杰 |
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| 作者单位： | 上海大学,材料与科学与工程学院,上海,200072 |
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| 基金项目： | 中信-CBMM铌钢研究与开发基金，上海大学研究生创新基金 |
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| 摘 要： | 用热膨胀测量和热分析方法测定了Nb对灰铸铁共析温度、共晶凝固温度的影响。试验结果表明：（1）在灰铸铁升温过程中,由于富Nb相对C原子的拖曳作用,以及富Nb相降低了渗碳体的溶解速度,从而降低了珠光体向奥氏体转变的温度,提高了铸铁的高温稳定性;（2）在灰铸铁降温过程中,由于晶界处的Nb析出,降低了奥氏体的不稳定性,以及富Nb相中Nb对C原子的拖曳作用,推迟了奥氏体向珠光体转变;（3）Nb降低了灰铸铁的共晶凝固温度。
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| 关 键 词： | 灰铸铁 Nb 相变温度 |
Influence of Nb on Phase Transition Temperature of Gray Irons |
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| YAN Yong-sheng,SUN Xiao-liang,ZHU Hong-bo,HUA Qin,ZAI Qi-jie.Influence of Nb on Phase Transition Temperature of Gray Irons[J].Modern Cast Iron,2011(2):42-44. |
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| Authors: | YAN Yong-sheng SUN Xiao-liang ZHU Hong-bo HUA Qin ZAI Qi-jie |
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| Affiliation: | YAN Yong-sheng,SUN Xiao-liang,ZHU Hong-bo,HUA Qin,ZAI Qi-jie(Materials Science and Engineering College,Shanghai University,Shanghai 200072,China) |
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| Abstract: | The influence of Nb on the eutectoid temperature and eutectic solidification temperature of gray irons was investigated by using thermal expansion and thermal analysis.The test results showed:(1)During temperature increasing process of the gray irons,since the niobium-rich phase had the traction effect to the C atoms and the Nb-rich phase reduced the dissolution rate of the cementite,the temperature of pearlite transiting to austenite was decreased so that the high temperature stability of the cast irons wa... |
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| Keywords: | gray iron niobium phase transition temperature |
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