Influence of coarsened and rafted microstructures on the thermomechanical fatigue of a Ni-base superalloy

Kirka, M. M.; Brindley, K. A.; Neu, R. W.; Antolovich, S. D.; Shinde, S. R.; Gravett, P. W.

doi:10.1016/j.ijfatigue.2015.08.001

Title: Influence of coarsened and rafted microstructures on the thermomechanical fatigue of a Ni-base superalloy

Journal Article · Mon Aug 17 00:00:00 EDT 2015 · International Journal of Fatigue

DOI:https://doi.org/10.1016/j.ijfatigue.2015.08.001· OSTI ID:1261314

Kirka, M. M. ^[1]; Brindley, K. A. ^[1]; Neu, R. W. ^[2]; Antolovich, S. D. ^[2]; Shinde, S. R. ^[3]; Gravett, P. W. ^[3]

Georgia Inst. of Technology, Atlanta, GA (United States). George W. Woodruff School of Mechanical Engineering
Georgia Inst. of Technology, Atlanta, GA (United States). George W. Woodruff School of Mechanical Engineering; Georgia Inst. of Technology, Atlanta, GA (United States). School of Materials Science and Engineering
Siemens Energy Inc., Orlando, FL (United States)

The aging of the microstructure of Ni-base superalloys during service is mainly characterized by coarsening and rafting of the γ' precipitates. The influence of these different aged microstructures on thermomechanical fatigue (TMF) under either continuously cycled (CC) and creep-fatigue (CF) was investigated. Three different aged microstructures, generated through accelerated aging and pre-creep treatments, were studied: stress-free coarsened γ', rafted with orientation perpendicular to loading direction (N-raft), and rafted with orientation parallel to loading direction (P-raft). Under most conditions, the aged microstructures were less resistant to TMF than the virgin microstructure; however, there were exceptions. Both stress-free coarsened and N-raft microstructures resulted in a reduction in TMF life under both CC and CF conditions in comparison to the virgin material. P-raft microstructure also resulted in reduction in TMF life under CC conditions; however, an increase in life over that of the virgin material was observed under CF conditions. Finally, these differences are discussed and hypothesized to be related to the interactions of the dislocations in the γ channels with γ' precipitates.

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Research Organization:: Siemens Energy Inc., Orlando, FL (United States); Georgia Institute of Technology, Atlanta, GA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FC26-05NT42644

OSTI ID:: 1261314

Alternate ID(s):: OSTI ID: 1245239

Journal Information:: International Journal of Fatigue, Vol. 81; ISSN 0142-1123

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 39 works

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