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首页> 外文会议>TMS(The Minerals, Metals amp; Materials Society) Annual Meeting and Symposium on Magnesium Technology; 20040314-20040318; Charlotte,NC; US >METAL-MOLD HEAT TRANSFER AND SOLIDIFICATION OF MAGNESIUM ALLOYS IN BELT CASTING PROCESSES
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METAL-MOLD HEAT TRANSFER AND SOLIDIFICATION OF MAGNESIUM ALLOYS IN BELT CASTING PROCESSES

机译：带铸过程中金属模的传热和镁合金的凝固

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摘要

A high speed strip casting simulator has been designed to simulate the casting of magnesium sheet alloys (AM50 and AZ91) on a single belt horizontal caster. Using Inverse Heat Transfer Analysis, temperature-time data from thermocouples inserted in the copper or steel bar substrates were used to deduce instantaneous heat fluxes between the solidifying strip and the moving mold substrates. Maximum, or peak, heat fluxes were registered downstream of the impact region for metal delivery onto the moving chill mold; for a copper substrate moving at 0.7m/s, peak heat fluxes were recorded after 0.3 seconds of contact, whereas those for a yttria stabilized zirconia coated steel substrate were registered following 2.5 seconds of metal-mold contact. The microstructures of the thin strips (3-4mm thick, 1m long, and 40mm wide) were characterized in terms of SDAS (Secondary Dendrite Arm Spacings) as well as cooling rates. It was found that the major thermal resistance to heat flow from the strip to the substrate resided in an interfacial layer separating the strip from the substrate. This interfacial layer presumably corresponded to the entrainment of a thin gas film, which was manifested in the texture of the bottom surface which was seen to contain numerous small air pockets. Methods to resolve these issues, and to improve thermal contact, are discussed. Results to date suggest that the peaks in the maximum heat fluxes corresponded to maxima in the release of the alloy's latent heat of crystallization during their transformation from the liquid to solid crystalline state.
机译：设计了一种高速带钢铸造模拟器，以模拟单带卧式连铸机上镁薄板合金（AM50和AZ91）的铸造。使用逆传热分析，来自插入铜或钢条基材中的热电偶的温度-时间数据可用来推导出凝固带和活动模具基材之间的瞬时热通量。在冲击区域的下游记录了最大或峰值的热通量，以便将金属输送到移动的冷却模具中。对于以0.7m / s移动的铜基板，在接触0.3秒后记录了峰值热通量，而在金属模接触2.5秒后记录了经氧化钇稳定的氧化锆涂层钢基板的峰值热通量。细条的微观结构（3-4mm厚，1m长和40mm宽）的特征在于SDAS（二次枝晶臂间距）以及冷却速率。已经发现，对于从条带到基底的热流的主要热阻存在于将条带与基底分开的界面层中。该界面层大概对应于薄的气体膜的夹带，这表现在底表面的纹理中，该纹理被视为包含许多小气穴。讨论了解决这些问题并改善热接触的方法。迄今为止的结果表明，最大热通量的峰值与合金从液相转变为固态时释放的结晶潜热的最大值相对应。

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