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采用有限元法模拟LNGT72磁钢定向凝固过程的瞬态温度场,分析钢水浇注温度、热流密度和铸型烘烤温度对凝固前沿温度梯度(G)与凝固速度(R)比值的影响。结果表明:钢水浇注温度对G/R值影响最显著;在各种条件下,G/R值在凝固初期都呈跳跃性增长,当凝固厚度生长到5~6cm时,该值迅速下降且趋于重叠。模拟结果为LNGT72磁钢定向凝固工艺优化提供了依据。 相似文献
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如何实现快速高效脱磷,提高电弧炉运行效率,降低运行费用,是现代电弧炉炼钢急需解决的重大课题.针对这一问题,从理论上对发泡脱磷球团进行分析试验,并将试制出的发泡脱磷球团在30t超高功率电弧炉上进行了工业性试验,结果表明,发泡脱磷球团能提高脱磷效果,降低电耗,缩短冶炼时间. 相似文献
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覆膜砂壳型铸造法是一种利用合成树脂制取的覆膜砂形成铸型和型芯,以获得高品质铸件的工艺方法.文中探讨覆膜砂铸造成型工艺,并应用该方法试制出了摩托车用排气门座圈毛坯,经检测发现,试制的样件质量接近康明斯发动机使用的实物水平. 相似文献
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转炉炉壳变形分析及其控制措施 总被引:1,自引:0,他引:1
介绍了转炉炉壳变形的现状,转炉使用镁碳砖后,炉壳温度升高是炉壳变形的主要原因,提出了通过炉壳整形、改善炉壳材质和强化炉壳的冷却条件控制炉壳变形的措施. 相似文献
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To understand the solidification behavior of austenitic stainless steel in rotary electromagnetic-field, the influence of
low-frequency rotary electromagnetic-field on solidification structure of austenitic stainless steel in horizontal continuous
casting was investigated based on industrial experiments. The results show that the solidification structure of austenitic
stainless steel can be remarkably refined, the central porosity and shrinkage cavity can be remarkably decreased, and the
equiaxed grains zone are enlarged by means of application of appropriate low-frequency electromagnetic-field parameters. The
industrial trials verify that the stirring intensity of austenitic stainless steel should be higher compared with that of
plain carbon steel. Electromagnetic stirring affects the macrostructure even if the average magnetic flux density of the electromagnetic
stirring reaches 90 mT (amplitude reaches 141 mT) with the frequency of 3–4 Hz. Due to a higher viscosity, rotating speed
of molten stainless steel is 20%–30% lower than that of molten carbon steel in the same magnetic flux density.
Foundation item: Project(CSTC2007BB4216) supported by the Natural Science Foundation of Chongqing, China 相似文献
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分析冶金工程专业毕业设计(论文)工作中存在的问题与现状,提出了提高冶金工程专业毕业设计(论文)质量的一系列措施。 相似文献
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