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Effects of Microstructure and Humidity on Fatigue Strength of Maraging Steel

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Abstract:

Rotating bending fatigue tests were carried out for maraging steels with different grain size in moist air in order to investigate the effects of humidity, grain size and reversion austenite on fatigue strength of the steel. Fatigue strength was decreased by humidity, and the decrease in fatigue strength was large in larger grain sized steel. Both of the initiation and propagation of a crack were promoted by humidity. Many cracks initiated at the specimen surface and intergranular cracks were observed at specimen surface and on fracture surface when humidity was high. The decrease in fatigue strength by humidity was suppressed by formation of reversion austenite.

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Periodical:

Key Engineering Materials (Volumes 385-387)

Pages:

113-116

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.385-387.113

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Online since:

July 2008

Authors:

M. Miyazono, Norio Kawagoishi, Qing Yuan Wang, Eiji Kondo, Takanori Nagano

Keywords:

Crack Initiation, Crack Propagation, Fatigue, Grain Size, Humidity, Maraging Steel, Reversion Austenite

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© 2008 Trans Tech Publications Ltd. All Rights Reserved

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