Project Details
Projekt
FOR 727: Beyond Ni-Base Superalloys
Subject Area
Materials Science and Engineering
Term
from 2007 to 2015
Project identifier
Deutsche Forschungsgemeinschaft (DFG) - Project number 21563363
Structural metallic materials for applications in air at temperatures beyond 1200 °C would be attractive not only from industrial, environmental and socio-economical standpoints. It is also a major challenge for the materials science community and closely related fields to search for and subsequently develop alloy systems, which may be able to fulfil the above mentioned goals by utilising the basic principles of physical metallurgy. If potential alloy systems have been found, it is of not only prime importance to extensively characterise these materials with respect to the foreseen application but also to give appropriate feedback to the material developers for further optimisation. In this context, the Research Unit has focused on the two following alloy systems:
(1) Mo-Si-B, which has been in world-wide focus since a decade or so and for which the Research Unit has established well known expertise already;
(2) Co-Re, which has scarcely been characterised in available literature so far, but shows promise due to the following reasons.
Both systems possess melting points which are at least 250 °C above those of currently used Nickelbase superalloys. One of the main tasks of the Research Unit has been identified to find further alloying elements, which allow for an improvement of the following properties essential for any application as high temperature structural material:
(1) oxidation resistance,
(2) creep resistance,
(3) toughness and ductility at ambient temperatures,
(4) fatigue resistance.
The three former properties will be preferentially assessed during the first funding period while the (more complex) fatigue behaviour will be characterised in the second phase of the project, when the group has identified promising alloy compositions. Finally, these properties have not only to be correlated with the microstructure but should also be modelled on the basis of a quantitative microstructural analysis. The latter will foster a better understanding of the behaviour of the investigated alloys and may, eventually, lead to further improvements through refined alloy compositions.
(1) Mo-Si-B, which has been in world-wide focus since a decade or so and for which the Research Unit has established well known expertise already;
(2) Co-Re, which has scarcely been characterised in available literature so far, but shows promise due to the following reasons.
Both systems possess melting points which are at least 250 °C above those of currently used Nickelbase superalloys. One of the main tasks of the Research Unit has been identified to find further alloying elements, which allow for an improvement of the following properties essential for any application as high temperature structural material:
(1) oxidation resistance,
(2) creep resistance,
(3) toughness and ductility at ambient temperatures,
(4) fatigue resistance.
The three former properties will be preferentially assessed during the first funding period while the (more complex) fatigue behaviour will be characterised in the second phase of the project, when the group has identified promising alloy compositions. Finally, these properties have not only to be correlated with the microstructure but should also be modelled on the basis of a quantitative microstructural analysis. The latter will foster a better understanding of the behaviour of the investigated alloys and may, eventually, lead to further improvements through refined alloy compositions.
DFG Programme
Research Units
Projects
- Atomistische Modellierung des Einflusses von Legierungszusätzen auf die Korngrenzeigenschaften in Mo-Si-B und Co-Re Superlegierungen (Applicant Albe, Karsten )
- Hochtemperaturoxidationsverhalten und Oxidschichtstabilität (Applicant Christ, Hans Jürgen )
- Koordination der Forschungsgruppe 727 (Applicant Heilmaier, Martin )
- Kriechuntersuchungen im 1100°C Bereich an Co-Re Legierungen mit quantitativer Gefügeanalyse und transmissionselektronenmikroskopischen Untersuchungen (Thema geändert) (Applicant Eggeler, Gunther )
- Legierungsentwicklung Co-Re Legierungen (Applicant Rösler, Joachim )
- Legierungsentwicklung Mo-Si-B und Verformungsverhalten im Zug-, Biege- und Druckmodus bis 1400°C (Applicant Heilmaier, Martin )
- Mikrostrukturuntersuchungen und Kriechdatenerfassung von Mo-Si und Co-Re-Basislegierungen (Thema geändert) (Applicant Glatzel, Uwe )
Spokesperson
Professor Dr.-Ing. Martin Heilmaier
