Creep Crack Growth and Fractal Dimension of the Grain-boundary Fracture in Austenitic 21Cr–4Ni–9Mn Steel
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Manabu Tanaka
Abstract
The creep crack growth and the fractal dimension of grain-boundary fracture (Df or D̄f ) were examined using surface notched specimens with different fractal dimensions of the grain boundaries (Dgb) in austenitic 21Cr–4Ni–9Mn steel. The value of Df estimated in the scale range larger than about one grain-boundary length decreased with crack growth and with increasing bulk stress (gross section stress), while the value of Df was higher in the specimen with higher Dgb value. The value of D̄f estimated in the scale range smaller than about one grain-boundary length was close to the value of Dgb in each specimen and did not change with crack growth and with the bulk stress (gross section stress). The growth rate of creep crack was lower and the threshold stress intensity factor for crack growth was higher in the specimen with the higher Dgb value.
Abstract
Das Wachstum von Kriechrissen und die Fraktaldimension des Korngrenzenbruchs (Df oder D̄f ) wurden an oberflächlich gekerbten Proben mit unterschiedlichen Fraktal-dimensionen der Korngrenzen (Dgb) im austenitischen 21Cr–4Ni–9Mn Stahl untersucht. Der Df-Wert, der im Meßbereich größer als ungefähr eine Korngrenzlänge abgeschätzt wurde, nahm mit dem Rißwachstum und mit der Zunahme der Großabschnittspannung (bulk stress) ab, obwohl der Df-Wert höher in der Probe mit höherem Dgb-Wert war. Der D̄f-Wert, der im Meßbereich kleiner als ungefähr eine Korngrenzlänge äbgeschätzt wurde, war in der Nähe des Dgb-Wertes in der einzelnen Probe und veränderte sich nicht mit dem Rißwachstum und mit der Großabschnittspannung (bulk stress). Die Wachstumsgeschwindigkeit des Kriechrisses war niedriger und die Schwellspannungsintensität des Rißwachstums war höher in der Probe mit höherem Dgb-Wert.
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© 1997 Carl Hanser Verlag, München
Artikel in diesem Heft
- Frontmatter
- Aufsätze
- Segregation and Precipitation during Solidification of Titanium and Nitrogen Containing Iron Alloys
- Microtexture and Orientation Relations Analysis in Surroundings of Shear Bands in Monocrystalline Copper
- Correlation Between Microstructure and Creep Behavior of the High-Temperature Ti Alloy IMI 834
- The Influence of Cold Working and Recrystallization on the Homogenization of As-cast Cu-50 wt.% Ni Alloy
- Casting of Particulate Al-base Composites
- Creep Crack Growth and Fractal Dimension of the Grain-boundary Fracture in Austenitic 21Cr–4Ni–9Mn Steel
- The Energy Release Rate of Nonlinear Double Cantilever Beam Specimens
- Thermodynamic Properties of Solid Aluminium– Iron Alloys
- An Assessment of Thermodynamic Equilibria in the Ag–Al–Cu–Mg Quaternary System in Relation to Precipitation Reactions
- Experimental Study of Phase Equilibria in the Fe–Cr –Mn System in the Temperature Range 1073 to 1373 K
- Thermodynamic Properties and Phase Equilibria in the Ca–Sb System
- Phase Equilibria in the Ti-rich Corner of the Ti –Si –Al System
- Mitteilungen der Deutschen Gesellschaft für Materialkunde e.V.
- Personen
- Fortbildung
- Terminkalender
Artikel in diesem Heft
- Frontmatter
- Aufsätze
- Segregation and Precipitation during Solidification of Titanium and Nitrogen Containing Iron Alloys
- Microtexture and Orientation Relations Analysis in Surroundings of Shear Bands in Monocrystalline Copper
- Correlation Between Microstructure and Creep Behavior of the High-Temperature Ti Alloy IMI 834
- The Influence of Cold Working and Recrystallization on the Homogenization of As-cast Cu-50 wt.% Ni Alloy
- Casting of Particulate Al-base Composites
- Creep Crack Growth and Fractal Dimension of the Grain-boundary Fracture in Austenitic 21Cr–4Ni–9Mn Steel
- The Energy Release Rate of Nonlinear Double Cantilever Beam Specimens
- Thermodynamic Properties of Solid Aluminium– Iron Alloys
- An Assessment of Thermodynamic Equilibria in the Ag–Al–Cu–Mg Quaternary System in Relation to Precipitation Reactions
- Experimental Study of Phase Equilibria in the Fe–Cr –Mn System in the Temperature Range 1073 to 1373 K
- Thermodynamic Properties and Phase Equilibria in the Ca–Sb System
- Phase Equilibria in the Ti-rich Corner of the Ti –Si –Al System
- Mitteilungen der Deutschen Gesellschaft für Materialkunde e.V.
- Personen
- Fortbildung
- Terminkalender
