High thermal gradient directional solidification and its application in the processing of nickel-based superalloys
High thermal gradient directional solidification and its application in the processing of nickel-based superalloys
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高热梯度定向凝固及其在镍基高温合金加工中的应用
DOI：
10.1016/j.jmatprotec.2009.07.022
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发表时间：
2010-01-01
影响因子：
6.3
通讯作者：
Fu, Hengzhi
中科院分区：
文献类型：
--
作者：
Liu, Lin;Huang, Taiwen;Fu, Hengzhi
分析了Bridgman型定向凝固过程中的传热规律，建立了合金性能、工艺参数和设备特性对温度梯度的影响关系。基于这种关系，已经开发了一些获得高的热梯度的方法。通过使用区域强化过热和液态金属冷却，实现了高达800 K/cm的LIP热梯度。这些方法在单晶高温合金加工中的应用表明，高热梯度定向凝固产生更均匀的组织和优化的机械性能。(C)2009 Elsevier B. V.保留所有权利。
The heat transfer during directional solidification by Bridgman-type directional solidification has been analyzed and a relationship has been established that reflects the effect of alloy properties, process parameters and equipment characteristics on thermal gradients. Based on this relationship, some methods for obtaining high thermal gradients have been developed. By using zone-intensified overheating and liquid-metal cooling, high thermal gradients of LIP to 800 K/cm were achieved. Application of these methods in the processing of single crystal superalloys indicated that high thermal gradient directional solidification produced more uniform microstructures and optimized mechanical properties. (C) 2009 Elsevier B.V. All rights reserved.