低偏析技术的发展

发布时间：2018-02-16 09:50

  本文关键词： 偏析 低偏析技术 微量元素 凝固区间　出处：《金属学报》2017年05期 　论文类型：期刊论文

【摘要】：师昌绪先生领导的铸造高温合金团队80年代初开始了低偏析技术的研究。将低偏析技术扩展应用到火电大轴用30Cr2Ni4Mo V钢、核电蒸发器传热管用690合金以及核燃料用铀合金。通过解剖3支百吨常压电弧炉熔炼的30Cr2Ni4Mo V钢锭,发现控制微量元素O、Al含量可以显著减少偏析。研究了690合金、U-6Nb合金与高碳铀的凝固行为,S、N扩大了690合金的凝固温度区间,并且S的影响大于N的影响;通过控制微量元素S、N含量可使690合金组织中成分均匀。在具有放射性元素的U-6Nb合金和高碳铀中,计算了U-6Nb的凝固温度区间为183℃;在高碳铀中,当C含量由0.01%增加到0.03%时,其凝固温度区间由40℃增加到了75℃;C扩大了高碳铀的凝固温度区间。U-6Nb合金和高碳铀的凝固偏析严重,采用低偏析技术控制U-6Nb合金中的C、N、O含量及高碳铀中C、O含量,达到了减轻凝固偏析的效果,表明低偏析技术具有普适性。
[Abstract]:In 80s, the casting superalloy team led by Shi Changxu began the research of low segregation technology. The low segregation technology was extended to 30Cr2Ni4Mo steel for large shaft of thermal power plant. 690 alloy for heat transfer tube of nuclear power evaporator and uranium alloy for nuclear fuel. 30Cr2Ni4Mo V ingot melted by three hundred ton atmospheric arc furnace, It is found that the segregation can be significantly reduced by controlling the content of trace element O _ 2O _ 3.The solidification behavior of U-6Nb alloy of 690 alloy and high-carbon uranium alloy is studied. The solidification temperature range of alloy 690 is enlarged by Sn, and the influence of S is greater than that of N. The composition of alloy 690 can be homogenized by controlling the content of trace element Sno. The solidification temperature range of U-6Nb is calculated to be 183 鈩，

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