Characterization of the microstructure evolution in a nickel base superalloy during continuous cooling conditions

被引：164
作者：
Babu, SS [1 ]
Miller, MK [1 ]
Vitek, JM [1 ]
David, SA [1 ]
机构：
[1] Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA
来源：
ACTA MATERIALIA | 2001年 / 49卷 / 20期
关键词：
welding; transmission electron microscopy (TEM); atom probe; nickel base superalloys;
D O I：
10.1016/S1359-6454(01)00314-7
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The solidification characteristics of the gamma -phase from the liquid and the subsequent decomposition of the gamma phase control the evolution of the microstructure in nickel-base superalloy welds. The precipitation of the gamma phase from the gamma phase during continuous cooling conditions (0.17-75 K s(-1)) from the solutionizing temperature was characterized in a directionally solidified CM247DS alloy with thermomechanical simulator, and by transmission electron microscopy, atom probe field ion microscopy and atom probe tomography. The number density increased; size decreased and morphology of the gamma precipitates changed with an increase in cooling rate. Under rapid water-quenched conditions. complex partitioning of the alloying elements between gamma and gamma phases was observed, Atom probe tomography on samples subjected to slower cooling rates showed different partitioning behavior compared to that of water-quenched samples and the presence of secondary gamma precipitates in the samples subjected to a cooling rate of 1 K s(-1). Published by Elsevier Science Ltd on behalf of Acta Materialia Inc.
引用
收藏
页码：4149 / 4160
页数：12
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