MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Fatigue Strength of Alloy 718 at High-Temperatures
Kazuo KobayashiKoji Yamaguchi
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2005 Volume 46 Issue 4 Pages 869-871

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Abstract

The high-temperature fatigue properties of an Alloy 718 were investigated up to 107 cycles. Combined with the data for base metals and welded joints, the relationship between stress amplitude and number of cycles to failure (fatigue life) was characterized by two steps in the SN curve. The fracture mechanisms were different between high and low stress levels. At high stress levels, fatigue fractures initiated from the specimen surface, whereas at low stress levels, the initiation was inside the surface. The internal fracture initiation sites were crystallographic flat facets of austenitic grains.

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© 2005 The Japan Institute of Metals and Materials
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