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Licensed Unlicensed Requires Authentication Published by De Gruyter November 30, 2021

Creep Crack Growth and Fractal Dimension of the Grain-boundary Fracture in Austenitic 21Cr–4Ni–9Mn Steel

Das Wachstum von Kriechrissen und die Fraktaldimension des Korngrenzenbruchs in austenitischem 21Cr-4Ni-9Mn Stahl
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.


Manabu Tanaka Department of Mechanical Engineering Mining College, Akita University 1-1 Tegatagakuen-cho, Akita, Japan

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Received: 1996-04-02
Published Online: 2021-11-30

© 1997 Carl Hanser Verlag, München