Exploring the fundamentals of Ni-based superalloy single crystal (SX) alloy design: Chemical composition vs. microstructure

Horst, Oliver Martin; Adler, David A.; Git, P.; Wang, Hongcai; Streitberger, J.; Holtkamp, Michael; Jöns, Niels; Singer, Robert F.; Körner, Carolin; Eggeler, Gunther

doi:10.1016/j.matdes.2020.108976

Cited by 42 publications

(19 citation statements)

References 49 publications

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“…Their nominal chemical compositions are listed in Table 1. ERBO/1 is a CMSX-4 type of alloy, details on processing, multiple step heat treatment and microstructure have been published elsewhere [32,33,36,37]. ERBO/15 is a low-density Refree single-crystal Ni-base superalloy, which has been developed by Rettig et al [34] using a numerical thermodynamic multi-criteria optimization method.…”

Section: Materials Experiments and Methodsmentioning

confidence: 99%

“…While ERBO/1 was heat-treated by Doncasters Precision Castings in Bochum, the heat treatments of the ERBO/15 variants were performed in a custom-built vacuum heat treatment furnace from Carbolite Gero of type LHTM 100-200/16 1G. Detailed information about the heat treatment procedure is documented in [32] and [36].…”

Section: Materials Experiments and Methodsmentioning

confidence: 99%

“…The compositions of the c-and c& -phase (c c and c c& ) in the four investigated alloys were measured with 3D APT (ERBO 1) [36] and with TEM-EDX (ERBO 15 and derivatives) [32]. The experimental results for the two phases are presented in Tables 7 (c-phase) and 8 (c&phase).…”

Section: Calculated and Measured Phase Compositionsmentioning

confidence: 99%

“…It uses resonant ultrasonic spectroscopy (RUS) and dilatometry to measure elastic stiffnesses and thermal expansion coefficients as a function of temperature. It has recently been shown how these four alloys differ in terms of creep properties [32,33].…”

Section: Introductionmentioning

confidence: 99%

“…For this purpose, we compare experimental results for c& -solvus temperatures obtained by hightemperature dilatometry with theoretical Ther-moCalc calculations [35]. The quality of the Ther-moCalc predications is assessed by comparing its predictions for the chemical compositions of the cand c& -phases obtained using 3D atom probe tomography (3D-ATP) [36] and transmission electron microscopy (TEM) [32]. To establish high-resolution measurements of thermal expansion as a method for determining c& -solvus represents a significant progress in superalloy technology.…”

Section: Introductionmentioning

confidence: 99%

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Thermoelastic properties and γ’-solvus temperatures of single-crystal Ni-base superalloys

et al. 2021

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The present work shows that thermal expansion experiments can be used to measure the γʼ-solvus temperatures of four Ni-base single-crystal superalloys (SX), one with Re and three Re-free variants. In the case of CMSX-4, experimental results are in good agreement with numerical thermodynamic results obtained using ThermoCalc. For three experimental Re-free alloys, the experimental and calculated results are close. Transmission electron microscopy shows that the chemical compositions of the γ- and the γʼ-phases can be reasonably well predicted. We also use resonant ultrasound spectroscopy (RUS) to show how elastic coefficients depend on chemical composition and temperature. The results are discussed in the light of previous results reported in the literature. Areas in need of further work are highlighted. Graphical abstract

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Section: Materials Experiments and Methodsmentioning

confidence: 99%

Section: Materials Experiments and Methodsmentioning

confidence: 99%

Section: Calculated and Measured Phase Compositionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermoelastic properties and γ’-solvus temperatures of single-crystal Ni-base superalloys

et al. 2021

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The High Temperature Strength of Single Crystal Ni‐base Superalloys – Re‐visiting Constant Strain Rate, Creep, and Thermomechanical Fatigue Testing

Sirrenberg,

Babinský,

Bürger

et al. 2024

Adv Eng Mater

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The present work takes a new look at the high temperature strength of single crystal (SX) Ni‐base superalloys. It compares high temperature constant strain rate (CSR) testing, creep testing and out‐of‐phase thermomechanical fatigue (OP‐TMF) testing, which represent key characterization methods supporting alloy development and component design in SX material science and technology. The three types of tests are compared using the same SX alloy, working with precisely oriented <001>‐specimens and considering the same temperature range between 1023 and 1223 K, where climb‐controlled micro‐creep processes need to be considered. Nevertheless, the three types of tests provide different types of information. CSR testing at imposed strain rates of 3.3·10‐4 s‐1 shows a yield stress anomaly (YSA) with a YSA stress peak at a temperature of 1073 K. This increase of strength with increasing temperature is not observed during constant load creep testing at much lower deformation rates around 10‐7 s‐1. Creep rates show a usual behavior and increase with increasing temperatures. During OP‐TMF loading, the temperature continuously increases/decreases in the compression/tension part of the mechanical strain‐controlled cycle (±0.5%). At the temperature, where the YSA peak stress temperature is observed, no peculiarities are observed. It is shown that OP‐TMF life is sensitive to surface quality, which is not the case in creep. A smaller number of cycles to failure is observed when reducing the heating rate in the compression/heating part of the mechanical strain‐controlled OP‐TMF cycle. The results are discussed on a microstructural basis, using results from scanning and transmission electron microscopy, and in light of previous work published in the literature.This article is protected by copyright. All rights reserved.

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On the Influence of Alloy Composition on Creep Behavior of Ni-Based Single-Crystal Superalloys (SXs)

et al. 2020

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Exploring the fundamentals of Ni-based superalloy single crystal (SX) alloy design: Chemical composition vs. microstructure

Cited by 42 publications

References 49 publications

Thermoelastic properties and γ’-solvus temperatures of single-crystal Ni-base superalloys

Thermoelastic properties and γ’-solvus temperatures of single-crystal Ni-base superalloys

The High Temperature Strength of Single Crystal Ni‐base Superalloys – Re‐visiting Constant Strain Rate, Creep, and Thermomechanical Fatigue Testing

On the Influence of Alloy Composition on Creep Behavior of Ni-Based Single-Crystal Superalloys (SXs)

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