Experimental Study of High Temperature Fracture Behavior of A286 Superalloy at 650°C

In this paper an experimental work is done for investigation of high temperature fracture properties of A286 superalloy at 650°C. Stress intensity factor K and parameter C * for this superalloy are determined experimentally. For estimation of these parameters, an instrument is developed for investig...

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Bibliographic Details
Published in:Physical mesomechanics 2018-03, Vol.21 (2), p.157-164
Main Authors: Hagh Panahi, M., Pirali, H.
Format: Article
Language:English
Subjects:
Classical Mechanics
Compact tension
Crack propagation
Creep (materials)
Creep tests
Ductile fracture
High temperature
Materials Science
Overaging
Parameter estimation
Physics
Physics and Astronomy
Plane stress
Solid State Physics
Stress intensity factors
Superalloys
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Summary:In this paper an experimental work is done for investigation of high temperature fracture properties of A286 superalloy at 650°C. Stress intensity factor K and parameter C * for this superalloy are determined experimentally. For estimation of these parameters, an instrument is developed for investigation of high temperature fracture properties. For estimation of stress intensity factor, compliance method is used. For this purpose four different compact tension specimens are tested and the parameter K is estimated. Creep tests are done for the selected specimens and parameter C * is determined by semiempirical relationships at 650°C. In these tests it is concluded that the specimens are placed near the plane stress condition. Crack growth behavior of this alloy is also studied. High incubation time (600 h) leads to overaging and therefore this alloy after this time showed very ductile creep properties, and fast creep crack growth was the major result of this overaging phenomenon. Finally the obtained results are compared with well-known nonexperimental methods for determination of these parameters. The obtained results showed that the results are in good agreement with each other.
ISSN:1029-9599
1990-5424
DOI:10.1134/S1029959918020091