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Fatigue Properties of Ni-Base Superalloy in Long Life Region

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Abstract:

Fatigue properties of Inconel 718 at 500°C were investigated under rotating bending. Fatigue strength was higher at 500°C than at room temperature. Fracture occurred by the initiation and propagation of a surface crack in short life region. The early propagation of a surface crack smaller than 20-30 μm was suppressed by oxidation at 500°C. This is a main reason for the higher fatigue strength at 500°C. However, the crack growth after the retardation of a small crack growth at 500°C was accelerated reflecting the lower static strength. On the other hand, in long life region, though a surface crack initiated at the early stage of fatigue life similar to the case in short life region, the crack did not propagate over 20-30 μm, and an internal fracture occurred. Consequently S-N curve at 500°C showed a duplex property and the fatigue limit was not recognized. The subsurface damage was initiated at the early stage of fatigue life.

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Periodical:

Key Engineering Materials (Volumes 353-358)

Pages:

126-129

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.353-358.126

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Online since:

September 2007

Authors:

Y. Matsuyama, Norio Kawagoishi, Qing Yuan Wang, Kazuhiro Morino, Eiji Kondo, Nu Yan

Keywords:

Elevated Temperature, Fatigue, Inconel 718, Internal Fracture, Long Life Region

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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