液态金属喷淋冷却定向凝固设备的研制  

Development of Directional Solidification Equipment with Liquid Metal Spay Cooling

作　　者：谌国军 李传军[1,2,3] 齐永顺 李丰文 玄伟东 任忠鸣[1,2,3] CHEN Guojun;LI Chuanjun;QI Yongshun;LI Fengwen;XUAN Weidong;REN Zhongming(State Key Laboratory of Advanced Special Steel,Shanghai University,Shanghai 200444,China;Shanghai Key Laboratory of Advanced Ferrometallurgy,Shanghai 200444,China;School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学省部共建高品质特殊钢冶金与制备国家重点实验室,上海200444 [2]上海市钢铁冶金新技术开发应用重点实验室,上海200444 [3]上海大学材料科学与工程学院,上海200444

出　　处：《上海金属》2022年第2期98-103,110,共7页Shanghai Metals

基　　金：航空发动机及燃气轮机重大专项基础研究项目(2017-Ⅶ-0008-0102)。

摘　　要：高温度梯度是控制高温合金定向凝固组织的重要参数。为了获得高的温度梯度,基于液态金属喷淋冷却定向凝固技术,设计并建造了一套通过喷淋液态锡使高温合金定向凝固的设备。热流分析发现,液态金属喷淋冷却定向凝固技术的热流密度比传统的高速凝固技术提高了47%。采用DZ22高温合金进行了喷淋液态锡使之定向凝固的试验。结果表明:在液态锡喷淋冷却条件下定向凝固的Φ15 mm DZ22高温合金试样枝晶组织细小,三次枝晶发达,这是液态锡喷淋冷却提高了温度梯度所致。High temperature gradient is one of the important parameters in controlling the directional solidification structure of superalloy. To obtain a higher temperature gradient, a set of liquid tin spraying equipment by which superalloy may be directionally solidified was designed and built on the basis of a directional solidification technology with liquid metal spray cooling. It was found from heat flux analysis that heat flux density of the liquid metal spraying cooling directional solidification technology was 47% higher than that of the traditional high-speed solidification technology. A test for directional solidification of DZ22 superalloy which was achieved by spraying liquid tin was performed. The results showed that the DZ22 superalloy sample 15 mm in diameter directionally solidified under the condition of the use of liquid tin spraying cooling exhibited refined dendrites and well-developed tertiary dendrites, which was attributed to a higher temperature gradient caused by liquid tin spraying cooling.

关 键 词：定向凝固 温度梯度 高温合金 液态金属 

分 类 号：TG244[金属学及工艺—铸造]