Quantitative experimental determination of the solid solution hardening potential of rhenium, tungsten and molybdenum in single-crystal nickel-based superalloys

被引：137

作者：

Fleischmann, Ernst ^{[1
]}

Miller, Michael K. ^{[2
]}

Affeldt, Ernst ^{[3
]}

Glatzel, Uwe ^{[1
]}

机构：

[1] Univ Bayreuth, Met & Alloys, D-95447 Bayreuth, Germany

[2] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA

[3] MTU Aero Engines AG, D-80995 Munich, Germany

来源：

ACTA MATERIALIA | 2015年 / 87卷

关键词：

Solid solution; Single crystal; Creep; Nickel-based superalloys; Rhenium; STACKING-FAULT ENERGY; NI-BASED SUPERALLOYS; CREEP-PROPERTIES; CR ALLOYS; TEMPERATURE ALLOYS; MATRIX; MICROSTRUCTURE; MICROSCOPY; BEHAVIOR; DESIGN;

D O I：

10.1016/j.actamat.2014.12.011

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The solid-solution hardening potential of the refractory elements rhenium, tungsten and molybdenum in the matrix of single-crystal nickel-based superalloys was experimentally quantified. Single-phase alloys with the composition of the nickel solid-solution matrix of superalloys were cast as single crystals, and tested in creep at 980 degrees C and 30-75 MPa. The use of single-phase single-crystalline material ensures very clean data because no grain boundary or particle strengthening effects interfere with the solid-solution hardening. This makes it possible to quantify the amount of rhenium, tungsten and molybdenum necessary to reduce the creep rate by a factor of 10. Rhenium is more than two times more effective for matrix strengthening than either tungsten or molybdenum. The existence of rhenium clusters as a possible reason for the strong strengthening effect is excluded as a result of atom probe tomography measurements. If the partitioning coefficient of rhenium, tungsten and molybdenum between the gamma matrix and the gamma' precipitates is taken into account, the effectiveness of the alloying elements in two-phase superalloys can be calculated and the rhenium effect can be explained. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：350 / 356

页数：7

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