Recrystallization mechanism for the grain refinement in undercooled DD3 single-crystal superalloy

被引：23
|
作者：
Liu, F [1 ]
Guo, XF [1 ]
Yang, GC [1 ]
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China
来源：
JOURNAL OF CRYSTAL GROWTH | 2000年 / 219卷 / 04期
基金：
中国国家自然科学基金;
关键词：
undercooling; grain refinement; recrystallization; DD3 single-crystal superalloy;
D O I：
10.1016/S0022-0248(00)00759-4
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
An investigation of the grain refinement in the bulk undercooled DD3 single-crystal superalloy is performed. The application of a molten salt denucleating technique combined with thermal cycle enables such investigation over a wide range of undercooling up to 210K. The microstructure formation has been discussed with respect to undercooling, nucleation and recalescence as well as recrystallization during recalescence and post-recalescence, respectively. Furthermore, TEM and SEM techniques are employed to reveal the recrystallization mechanism for grain refinement occurring at the critical undercooling DeltaT*, and to explain the influence of Y' precipitation and solute segregation on the recrystallization? i.e. grain-boundary migration process. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：489 / 494
页数：6
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