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首页> 外文会议>A New Century International Conference on Metallurgical High Technology and New Materials of Heavy Nonferrous Metals (ICHNM'2002) Apr 3-5, 2002 Kunming, China >DEOXIDIZATION AND DENITROGENATION DURING VIM REFINING NI-BASE SUPERALLOY USING CaO CRUCIBLE
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DEOXIDIZATION AND DENITROGENATION DURING VIM REFINING NI-BASE SUPERALLOY USING CaO CRUCIBLE

机译：使用CaO坩埚在Vim精炼镍基高温合金过程中进行脱氧和脱氮

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摘要

The variations of oxygen and nitrogen contents during vacuum induction melting (VIM) Ni-6Cr-2Mo-6W-5Co alloy using CaO crucible were studied. It has been found that about 50 percents of oxygen and 6 percents of nitrogen could be removed during melting. Thermodynamic calculation showed that [C]-[O] reaction was far from getting equilibrium. The experimental results of carbon and oxygen contents in the liquid alloy corresponded with calcuated data when P_(CO) was 10~3 to 10~2 Pa. Al addition is beneficial to deoxidization and denitrogenation. Adding 0.5% Al could reduce oxygen content to below 6 ppm and nitrogen content to below 3 ppm. The oxygen and nitrogen solubilities with various degrees of vacuum as well as different amounts of Al addition at 1873 K were calculated. The calculated values corresponded with the experimental results. Increasing vacuum is an effective means of accelerating denitrogenation.
机译：研究了在使用CaO坩埚的真空感应熔炼（VIM）Ni-6Cr-2Mo-6W-5Co合金中氧和氮含量的变化。已经发现在熔化过程中可以除去约50％的氧和6％的氮。热力学计算表明，[C]-[O]反应远未达到平衡。当P_（CO）为10〜3〜10〜2 Pa时，液态合金中碳，氧含量的实验结果与计算结果相符。Al的添加有利于脱氧和脱氮。添加0.5％的Al可以将氧含量降低至6ppm以下，将氮含量降低至3ppm以下。计算了不同真空度下氧和氮的溶解度，以及在1873 K下添加了不同量的Al。计算值与实验结果一致。增加真空度是加速脱氮的有效手段。

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