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Characterization of high temperature long-term fatigue properties for advanced ferritic heat-resisting steels

Characterization of high temperature long-term fatigue properties for advanced ferritic... Axial strain-controlled fatigue tests of a 9 mass% chromium (Cr)–2 mass% tungsten (W) and a 12Cr-2W ferritic heat-resisting steels were performed to obtain fatigue life curves (S–N curve) over a wide from 10 2 to 10 6 cycles at room temperature (RT), 400, 600, 650 and 700°C, respectively. As the results, Manson–Coffin relationships between plastic strain range and fatigue life for the both the steels appear linear at RT and 400°C, however the relationships have inflection around 10 4 cycles beyond 600°C. Moreover, it is cleared that subgrains became coarse uniformly in the low-cycle regions, while subgrains did coarse locally near grain boundaries in the high-cycle regions. Therefore it is suggested that differences in the mechanical factors and change in subgrain structure cause the inflection of Manson–Coffin relations at the elevated temperatures. Then, a modified universal slope method is proposed for S–N curves that considered to inflection in Manson–Coffin relations. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Strength, Fracture and Complexity IOS Press

Characterization of high temperature long-term fatigue properties for advanced ferritic heat-resisting steels

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Publisher
IOS Press
Copyright
Copyright © 2012 by IOS Press, Inc
ISSN
1567-2069
eISSN
1875-9262
DOI
10.3233/SFC-2012-0151
Publisher site
See Article on Publisher Site

Abstract

Axial strain-controlled fatigue tests of a 9 mass% chromium (Cr)–2 mass% tungsten (W) and a 12Cr-2W ferritic heat-resisting steels were performed to obtain fatigue life curves (S–N curve) over a wide from 10 2 to 10 6 cycles at room temperature (RT), 400, 600, 650 and 700°C, respectively. As the results, Manson–Coffin relationships between plastic strain range and fatigue life for the both the steels appear linear at RT and 400°C, however the relationships have inflection around 10 4 cycles beyond 600°C. Moreover, it is cleared that subgrains became coarse uniformly in the low-cycle regions, while subgrains did coarse locally near grain boundaries in the high-cycle regions. Therefore it is suggested that differences in the mechanical factors and change in subgrain structure cause the inflection of Manson–Coffin relations at the elevated temperatures. Then, a modified universal slope method is proposed for S–N curves that considered to inflection in Manson–Coffin relations.

Journal

Strength, Fracture and ComplexityIOS Press

Published: Jan 1, 2012

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