Evaluation of fatigue crack growth rate and life prediction of Inconel 718at room and elevated temperatures

Citation
Q. Chen et al., Evaluation of fatigue crack growth rate and life prediction of Inconel 718at room and elevated temperatures, MAT SCI E A, 277(1-2), 2000, pp. 250-257
Citations number
18
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN journal
09215093 → ACNP
Volume
277
Issue
1-2
Year of publication
2000
Pages
250 - 257
Database
ISI
SICI code
0921-5093(20000131)277:1-2<250:EOFCGR>2.0.ZU;2-Q
Abstract
The fatigue crack growth behavior of Inconel 718 was investigated under rot ating bending fatigue at room temperature, 300, 500, and 600 degrees C in a ir. It has been found that the small crack growth rate could be evaluated b y the small crack growth law at high stress levels, where the small-scale y ielding conditions are exceeded and the Paris law is not applicable, irresp ective of the temperature. The fatigue strength of plain specimens increase d considerably in the long-life region at the elevated temperatures, becaus e the early growth of a small crack in the range of 20-30 mu m was suppress ed. However, a crack grew faster at higher temperature after growing beyond about 50 mu m due to the decrease of crack growth resistance. The fatigue life in the stable crack growth period can be predicted by the small crack growth law. (C) 2000 Elsevier Science S.A. All rights reserved.