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Metallurgical and Materials Transactions A
Published in: Metallurgical and Materials Transactions A 6/2014

01-06-2014 | Communication

Reduced Dwell-Fatigue Resistance in a Ni-Base Superalloy After Short-Term Thermal Exposure

Authors: Magnus Hörnqvist, Leif Viskari

Published in: Metallurgical and Materials Transactions A | Issue 6/2014

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Abstract

The effect of short-term thermal exposure on microstructure and dwell-fatigue resistance of Ni-base superalloy 718Plus was investigated. Contrary to previous studies performed after long-term exposure, an increase in the dwell-fatigue crack growth rate was observed, which was connected to a small increase in the size of the hardening precipitates. The proposed controlling mechanism was the stress relaxation rate at the crack tip, and based on this a schematic model for the development of the properties during exposure is presented.
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Metadata
Title
Reduced Dwell-Fatigue Resistance in a Ni-Base Superalloy After Short-Term Thermal Exposure
Authors
Magnus Hörnqvist
Leif Viskari
Publication date
01-06-2014
Publisher
Springer US
Published in
Metallurgical and Materials Transactions A / Issue 6/2014
Print ISSN: 1073-5623
Electronic ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-014-2291-4

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