液滴脉冲管中液滴开始固化时的液滴粒径和温度估计

2018/12/13   下载量： 0 次

方案摘要

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应用领域 钢铁/金属
检测样本 其他
检测项目 理化分析>粒度
参考标准 暂无

采用LaVision公司的阴影法粒子粒径和速度测量分析系统，对液滴脉冲管液态D2工具钢液滴，在下落，冷却，固化过程中的液滴粒径和温度参数进行了测量，并和其它类型测试设备进行了对比分析。

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方案详情

D2 tool steel powders were produced using a drop tube-impulse atomization technique. In order to measure the radiant energy and droplet size of atomized D2 steel droplets, DPV-2000 (Tecnar Automation Ltée, St. Hubert Quebec, Canada) was utilized. In-situ velocity and droplet size of the atomized droplets were also measured using shadowgraphy technique (Sizing Master Shadow from LaVision GmbH in Gottingen, Germany). A 3D translation stage was designed, constructed and installed inside the drop tube system. DPV-2000 and shadowgraph were then mounted on the translation stage. Using this stage, online measurements were conducted at 4 cm, 18 cm and 28 cm distances below the crucible. Using liquid (fully undercooled) and semi-solid behavior of droplets, it was possible to estimate the droplet size and temperature at which solidification starts. These values were then confirmed by the thermal model using experimentally estimated primary phase undercooling values. It was concluded that DPV-2000 is not accurate enough to detect the amount of recalescence during solidification of the droplets as they fall. But, comparing to the results from the heat loss model, reasonable estimates were obtained for different particle sizes solidifying at different distances using online measurement tools.

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北京欧兰科技发展有限公司
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