G. Sauthoff - Profile on Academia.edu (original) (raw)
Papers by G. Sauthoff
Materials Science and Engineering: A, 2011
The influence of hot-deformation and tempering temperature on the microstructure evolution of a 1... more The influence of hot-deformation and tempering temperature on the microstructure evolution of a 12%Cr heat resistant steel during short-term creep at 80-250 MPa and 650 • C was investigated. Quantitative determination of dislocation density and sub-grain size in the initial microstructure and after creep was investigated by STEM-HAADF. A correlation between microstructure evolution and creep response is established. All crept samples showed a significant increase of sub-grain size and a reduction of dislocation density. Hot-deformed samples showed better creep strength than non hot-deformed samples due to homogenization of the microstructure. The tempering temperature affected the dislocation density and the sub-grain size evolution, influencing the creep behavior.
Gegenüber warmfesten austenitischen Metalllegierungen zeichnen sich warmfeste ferritische Legieru... more Gegenüber warmfesten austenitischen Metalllegierungen zeichnen sich warmfeste ferritische Legierungen in der Regel durch eine bessere Wärmeleitfähigkeit und geringere Wärmeausdehnung aus, was günstig für Anwendungen in Energiewandlungsanlagen ist. Allerdings ist die Warmfestigkeit der ferritischen Werkstoffe geringer als die der austenitischen. Spezielle ferritische Eisen-Chrom-und Eisen-Aluminium-Legierungen werden durch Bildung intermetallischer Phasen gehärtet und bezüglich Warmfestigkeit, Verformbarkeit und Korrosionsbeständigkeit optimiert.
Twin thickness dependence of type-I twin intersections in a γ-TiAl-based Ti-45Al-8Nb-2.5Mn alloy deformed at room temperature
ABSTRACT
ORIENTING OF PRECIPITATING AU PARTICLES IN A Fe-Mo-Au ALLOY BY EXTERNAL ELASTIC STRESS - 2. DISCUSSION OF NUCLEATION, GROWTH, AND COARSENING
ABSTRACT
Deformation behaviour of the intermetallic phase Al3Nb with DO22 structure and of Al3Nb-base alloys: Part I. Physical properties and short-term behaviour
Intermetallics
ABSTRACT
Effects of stoichiometry, microalloying and aging heat treatments on the compressive behavior of NiAI alloys
Scripta Materialia
ABSTRACT
Intermetallics
The creep behaviour of g-TiAl with L1 0 structure without second phases, g-TiAl with precipitated... more The creep behaviour of g-TiAl with L1 0 structure without second phases, g-TiAl with precipitated particles of a 2 -Ti 3 Al with D0 19 structure, and g-TiAl with the H-phase Ti 2 AlC has been studied at low stresses in the temperature range 900±1200 C. The obtained data allow the construction of creep deformation mechanism maps for the studied alloys which may be used for an extrapolation of the observed creep behaviour. At higher stresses dislocation creep occurs in all alloys, which is well described by the Dorn equation with stress exponents in the range 3±5. Extended Coble creep with threshold stress was observed only for the studied two-phase alloys. A strong temperature dependence of the threshold stress for Coble creep was found for the TiAl alloy with carbide particles. #
Analysis of the stress orienting of α′ precipitates in FeN alloys
Acta Metallurgica, 1981
ABSTRACT
ChemInform Abstract: Intermetallic Alloys - Overview on New Materials Developments for Structural Applications in West Germany
ChemInform, 1991
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Growth kinetics and size distribution of ordered domains in Cu3Au
Acta Metallurgica, 1973
ABSTRACT
Comment interpretation of two step ageing experiments for the stress orienting of precipitates
Scripta Metallurgica, 1981
creep Behaviour of the Ordered Intermetallic (FE, NI)Al Phase
MRS Proceedings, 1984
ABSTRACT The deformation behaviour of the ordered intermetallic (Fe,Ni)Al phase with B2 structure... more ABSTRACT The deformation behaviour of the ordered intermetallic (Fe,Ni)Al phase with B2 structure is studied as a function of composition and temperature with stress strain tests and creep tests. The alloy composition has been varied with respect to stoichiometry and the Fe/Ni ratio. The creep resistivity depends on the alloy composition in a complex manner: a deviation from the stoichiometric compositions leads to a reduction of the creep resistance, and there is a maximum of the creep resistance for the ternary alloys with about 10% Fe.
Materials Science and Engineering, 1986
The creep behaviour of the ordered intermetallic (Fe, Ni)Al phase with a B2 structure was studied... more The creep behaviour of the ordered intermetallic (Fe, Ni)Al phase with a B2 structure was studied as a function of stress (for strain rates between 10 -9 and 10 -5 s-l), temperature (650-11 O0 °C) and composition. The secondary creep behaviour is described as that of disordered alloys by the Dorn equation. A low energy dislocation structure is formed in the nickel-rich alloys, whereas it is not observed in the iron-rich alloys because of insufficient driving force and dislocation mobility.
Acta Metallurgica, 1969
By means of transmission electron microscopy the size distribution of Ni,Si-particles precipitate... more By means of transmission electron microscopy the size distribution of Ni,Si-particles precipitated from the solid solution of Si in Ni has been measured as a function of concentration, ageing time and temperature. In all cases the distribution and mean particle size agree with the theory of diffusioncontrolled Ostwald ripening if a variable diffusion coefficient
The effect of martensite formation on the mechanical behaviour of NiAl
ABSTRACT
The creep behaviour of g-TiAl with L1 0 structure without second phases, g-TiAl with precipitated... more The creep behaviour of g-TiAl with L1 0 structure without second phases, g-TiAl with precipitated particles of a 2 -Ti 3 Al with D0 19 structure, and g-TiAl with the H-phase Ti 2 AlC has been studied at low stresses in the temperature range 900±1200 C. The obtained data allow the construction of creep deformation mechanism maps for the studied alloys which may be used for an extrapolation of the observed creep behaviour. At higher stresses dislocation creep occurs in all alloys, which is well described by the Dorn equation with stress exponents in the range 3±5. Extended Coble creep with threshold stress was observed only for the studied two-phase alloys. A strong temperature dependence of the threshold stress for Coble creep was found for the TiAl alloy with carbide particles. #
Strengthening of Hot Corrosion-Resistant Fe-Al alloys Through Laves Phase Precipitation
Iron–Aluminium-Base Alloys with Strengthening Laves Phase for Structural Applications at High Temperatures
Materials Science Forum, 2005
ABSTRACT
Mechanical Behavior and Oxidation Properties of Molybdenum-Modified Cr3Si/Cr5Si3 Intermetallics
MRS Proceedings, 1994
A Correlative Study of an Iron-Base Superalloy Using Transmission Electron Microscopy and Atom Probe Tomography
Microscopy and Microanalysis, 2006
Materials Science and Engineering: A, 2011
The influence of hot-deformation and tempering temperature on the microstructure evolution of a 1... more The influence of hot-deformation and tempering temperature on the microstructure evolution of a 12%Cr heat resistant steel during short-term creep at 80-250 MPa and 650 • C was investigated. Quantitative determination of dislocation density and sub-grain size in the initial microstructure and after creep was investigated by STEM-HAADF. A correlation between microstructure evolution and creep response is established. All crept samples showed a significant increase of sub-grain size and a reduction of dislocation density. Hot-deformed samples showed better creep strength than non hot-deformed samples due to homogenization of the microstructure. The tempering temperature affected the dislocation density and the sub-grain size evolution, influencing the creep behavior.
Gegenüber warmfesten austenitischen Metalllegierungen zeichnen sich warmfeste ferritische Legieru... more Gegenüber warmfesten austenitischen Metalllegierungen zeichnen sich warmfeste ferritische Legierungen in der Regel durch eine bessere Wärmeleitfähigkeit und geringere Wärmeausdehnung aus, was günstig für Anwendungen in Energiewandlungsanlagen ist. Allerdings ist die Warmfestigkeit der ferritischen Werkstoffe geringer als die der austenitischen. Spezielle ferritische Eisen-Chrom-und Eisen-Aluminium-Legierungen werden durch Bildung intermetallischer Phasen gehärtet und bezüglich Warmfestigkeit, Verformbarkeit und Korrosionsbeständigkeit optimiert.
Twin thickness dependence of type-I twin intersections in a γ-TiAl-based Ti-45Al-8Nb-2.5Mn alloy deformed at room temperature
ABSTRACT
ORIENTING OF PRECIPITATING AU PARTICLES IN A Fe-Mo-Au ALLOY BY EXTERNAL ELASTIC STRESS - 2. DISCUSSION OF NUCLEATION, GROWTH, AND COARSENING
ABSTRACT
Deformation behaviour of the intermetallic phase Al3Nb with DO22 structure and of Al3Nb-base alloys: Part I. Physical properties and short-term behaviour
Intermetallics
ABSTRACT
Effects of stoichiometry, microalloying and aging heat treatments on the compressive behavior of NiAI alloys
Scripta Materialia
ABSTRACT
Intermetallics
The creep behaviour of g-TiAl with L1 0 structure without second phases, g-TiAl with precipitated... more The creep behaviour of g-TiAl with L1 0 structure without second phases, g-TiAl with precipitated particles of a 2 -Ti 3 Al with D0 19 structure, and g-TiAl with the H-phase Ti 2 AlC has been studied at low stresses in the temperature range 900±1200 C. The obtained data allow the construction of creep deformation mechanism maps for the studied alloys which may be used for an extrapolation of the observed creep behaviour. At higher stresses dislocation creep occurs in all alloys, which is well described by the Dorn equation with stress exponents in the range 3±5. Extended Coble creep with threshold stress was observed only for the studied two-phase alloys. A strong temperature dependence of the threshold stress for Coble creep was found for the TiAl alloy with carbide particles. #
Analysis of the stress orienting of α′ precipitates in FeN alloys
Acta Metallurgica, 1981
ABSTRACT
ChemInform Abstract: Intermetallic Alloys - Overview on New Materials Developments for Structural Applications in West Germany
ChemInform, 1991
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Growth kinetics and size distribution of ordered domains in Cu3Au
Acta Metallurgica, 1973
ABSTRACT
Comment interpretation of two step ageing experiments for the stress orienting of precipitates
Scripta Metallurgica, 1981
creep Behaviour of the Ordered Intermetallic (FE, NI)Al Phase
MRS Proceedings, 1984
ABSTRACT The deformation behaviour of the ordered intermetallic (Fe,Ni)Al phase with B2 structure... more ABSTRACT The deformation behaviour of the ordered intermetallic (Fe,Ni)Al phase with B2 structure is studied as a function of composition and temperature with stress strain tests and creep tests. The alloy composition has been varied with respect to stoichiometry and the Fe/Ni ratio. The creep resistivity depends on the alloy composition in a complex manner: a deviation from the stoichiometric compositions leads to a reduction of the creep resistance, and there is a maximum of the creep resistance for the ternary alloys with about 10% Fe.
Materials Science and Engineering, 1986
The creep behaviour of the ordered intermetallic (Fe, Ni)Al phase with a B2 structure was studied... more The creep behaviour of the ordered intermetallic (Fe, Ni)Al phase with a B2 structure was studied as a function of stress (for strain rates between 10 -9 and 10 -5 s-l), temperature (650-11 O0 °C) and composition. The secondary creep behaviour is described as that of disordered alloys by the Dorn equation. A low energy dislocation structure is formed in the nickel-rich alloys, whereas it is not observed in the iron-rich alloys because of insufficient driving force and dislocation mobility.
Acta Metallurgica, 1969
By means of transmission electron microscopy the size distribution of Ni,Si-particles precipitate... more By means of transmission electron microscopy the size distribution of Ni,Si-particles precipitated from the solid solution of Si in Ni has been measured as a function of concentration, ageing time and temperature. In all cases the distribution and mean particle size agree with the theory of diffusioncontrolled Ostwald ripening if a variable diffusion coefficient
The effect of martensite formation on the mechanical behaviour of NiAl
ABSTRACT
The creep behaviour of g-TiAl with L1 0 structure without second phases, g-TiAl with precipitated... more The creep behaviour of g-TiAl with L1 0 structure without second phases, g-TiAl with precipitated particles of a 2 -Ti 3 Al with D0 19 structure, and g-TiAl with the H-phase Ti 2 AlC has been studied at low stresses in the temperature range 900±1200 C. The obtained data allow the construction of creep deformation mechanism maps for the studied alloys which may be used for an extrapolation of the observed creep behaviour. At higher stresses dislocation creep occurs in all alloys, which is well described by the Dorn equation with stress exponents in the range 3±5. Extended Coble creep with threshold stress was observed only for the studied two-phase alloys. A strong temperature dependence of the threshold stress for Coble creep was found for the TiAl alloy with carbide particles. #
Strengthening of Hot Corrosion-Resistant Fe-Al alloys Through Laves Phase Precipitation
Iron–Aluminium-Base Alloys with Strengthening Laves Phase for Structural Applications at High Temperatures
Materials Science Forum, 2005
ABSTRACT
Mechanical Behavior and Oxidation Properties of Molybdenum-Modified Cr3Si/Cr5Si3 Intermetallics
MRS Proceedings, 1994
A Correlative Study of an Iron-Base Superalloy Using Transmission Electron Microscopy and Atom Probe Tomography
Microscopy and Microanalysis, 2006