| Nb在铸铁中的物理冶金学作用原理 |
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| 引用本文： | 雍岐龙,孙新军,张正延,杨庚蔚.Nb在铸铁中的物理冶金学作用原理[J].现代铸铁,2011(2):15-21. |
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| 作者姓名： | 雍岐龙 孙新军 张正延 杨庚蔚 |
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| 作者单位： | 钢铁研究总院,结构材料研究所,北京,100081 |
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| 摘 要： | 介绍了Nb在铁基合金中的存在形式,根据NbC和NbN在不同铁基合金中的溶度积公式,分析了Nb在铸铁中的存在形式。在此基础上,分析了Nb在铸铁中的作用机理。固溶Nb具有非常重要的调节共析相变及强化铁素体基体的作用,凝固过程析出的Nb（C,N）可显著提高耐磨性,在奥氏体温度区间晶界析出的Nb（C,N）能有效阻止晶粒长大,合适的成分设计和工艺措施可充分发挥Nb的作用效果。
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| 关 键 词： | 铸铁 Nb Nb（C N） 溶度积 珠光体相变 |
Physical-Metallurgical Effect Fundamentals of Niobium in Cast Iron |
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| YONG Qi-long,SUN Xin-jun,ZHANG Zheng-yan,YANG Geng-wei.Physical-Metallurgical Effect Fundamentals of Niobium in Cast Iron[J].Modern Cast Iron,2011(2):15-21. |
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| Authors: | YONG Qi-long SUN Xin-jun ZHANG Zheng-yan YANG Geng-wei |
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| Affiliation: | (Structural Materials Research Institute,Central Iron & Steel Research Institute,Beijing 100081,China) |
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| Abstract: | The existing type of niobium in the matrix of cast irons was introduced.Based on the formulas of the solubility product for NbC and NbN in different iron matrixes,the existing types of niobium in the cast irons were analyzed.And on this base,the effect mechanism of niobium in the cast irons was analyzed.The solidly solved niobium had very important effect to modify the eutectoid transformation and to strengthen the ferrite matrix;the Nb(C,N) precipitating in solidification process could obviously increase wear resistance;the Nb(C,N) precipitating in the austenite temperature interval at the crystal boundaries could effectively retard the grains growth.Appropriate composition design and process measures could give full play to the effect of niobium. |
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| Keywords: | cast iron niobium niobium carbonitride solubility product pearlite transformation |
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