Creep properties beyond 1100°C and microstructure of Co-Re-Cr alloys

被引：26

作者：

Brunner, Martin ^{[1
]}

Huettner, Rainer ^{[1
]}

Boelitz, Marie-Christin ^{[1
]}

Voelkl, Rainer ^{[1
]}

Mukherji, Debashis ^{[2
]}

Roesler, Joachim ^{[2
]}

Depka, Timo ^{[3
]}

Somsen, Christoph ^{[3
]}

Eggeler, Gunther ^{[3
]}

Glatzel, Uwe ^{[1
]}

机构：

[1] Univ Bayreuth, D-95440 Bayreuth, Germany

[2] Tech Univ Carolo Wilhelmina Braunschweig, Inst Werkstoffe, D-38106 Braunschweig, Germany

[3] Ruhr Univ Bochum, Inst Werkstoffe, D-44780 Bochum, Germany

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2010年 / 528卷 / 02期

关键词：

High temperature materials; Co-Re-Cr; Creep; Microstructure; TEM; HIGH-TEMPERATURE ALLOYS; MO-SI; OXIDATION RESISTANCE; BASE ALLOYS; STRENGTH; COBALT; 1000-DEGREES-C; SUPERALLOYS;

D O I：

10.1016/j.msea.2010.09.035

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The melting point of a novel Co-17Re-23Cr alloy (numbers given in at.%) could be increased by 250 C as compared to established Ni-based superalloys, by optimising the content of Re. Samples were produced by vacuum arc-melting in order to evaluate the creep behaviour at temperatures beyond 1100 degrees C and for microstructural analysis. Three alloys (the Co-17Re-23Cr-based material, and the carbide strengthened alloys Co-17Re-23Cr-2.6C and Co-17Re-23Cr-2.6C-1.2Ta) were investigated. Creep properties, especially the minimum creep rate and the Larson-Miller plots, were compared. The Co-17Re-23Cr-2.6C-1.2Ta alloy has a higher minimum creep rate than Co-17Re-23Cr at 1200 degrees C but it has a lower minimum creep rate than Co-17Re-23Cr at 1100 degrees C. TaC coarsening, detected via transmission electron microscope (TEM) measurements may explain this effect. The overall creep behaviour of Co-17Re-23Cr-2.6C at 1200 degrees C is better than that of Co-17Re-23Cr-2.6C-1.2Ta, but worse than that of Co-17Re-23Cr. Microstructural investigations by scanning electron microscopy and TEM reveal a hexagonal closed-packed (hcp) matrix and sigma-phases. The microhardness of the sigma-phase was about 1570 HV (load: 1 g) and around 800 HV for the matrix. Pores and cracks occur along the brittle sigma-phases and grain boundaries in the Co-Re-Cr alloys. A Norton exponent n in between 1.4 and 3.0 points to grain boundary dominated creep mechanisms. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：650 / 656

页数：7

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