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Effect of Melt Superheating Treatment on Directional Solidification Interface Morphology of Multi-component Alloy

ISSN号：1005-0302
期刊名称：《材料科学技术学报：英文版》
时间：0
分类：TG115.2[金属学及工艺—物理冶金;金属学及工艺—金属学] TG166.7[金属学及工艺—热处理;金属学及工艺—金属学]
作者机构：[1]State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi an 710072, China
相关基金：supports from the National Natural Science Foundation of China （Grant No. 50931004）; the National Basic Research Program of China （Grant Nos. 2011CB610406 and 2010CB631202）; the National High Technology Research and Development Program （Grant No. 2007AA03Z552）

作者： Changshuai Wang Jun Zhang Lin Liu Hengzhi Fu[1]

关键词：凝固界面形态, 熔体过热处理, 镍基高温合金, 多组分, 树突细胞, 时间间隔, 起始温度, 凝固特性, Melt superheating treatment, Directional solidification interface morphology, Solidification characteristics, Multi-component alloy

中文摘要：

影响在固体 / 液体(S/L ) 上融化过热的处理方向性地团结的基于 Ni 的 superalloy DZ125 的接口形态学被调查阐明在之间的关系融化特征和 S/L 接口稳定性。当团结接口的热坡度与适当过热的处理规定为不同 T 仍然保持不变时，结果显示接口形态学不仅与退却速度(R) 有关而且到过热的 melt 是温度(T ) 。当 T 从 1500 敢愠灰敲敨獮癩增加时，接口形态学在 1.1/im/s 的 R 从房间改变到飞机吗？？

英文摘要：

The influence of melt superheating treatment on the solid/liquid （S/L） interface morphology of directionally solidified Ni-based superalloy DZ125 is investigated to elucidate the relationship between melt characteristic and S/L interface stability. The results indicate that the interface morphology is not only related to the withdrawal velocity （R） but also to the melt superheating temperature （Ts） when the thermal gradient of solidification interface remains constant for different Ts with appropriate superheating treatment regulation. The interface morphology changes from cell to plane at R of 1.1 μm/s when Ts increases from 1500°C to 1650°C, and maintains plane with further elevated Ts of 1750°C. However, the interface morphology changes from coarse dendrite to cell and then to cellular dendrite at R of 2.25 μm/s when Ts increases from 1500°C to 1650°C and then to 1750°C. It is proved that the solidification onset temperature and the solidification interval undergo the nonlinear variation when Ts increases from 1500°C to 1680°C, and the turning point is 1650°C at which the solidification onset temperature and the solidification interval are all minimum. This indicates that the melt superheating treatment enhances the solidification interface stability and has important effect on the solidification characteristics.

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