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Effect of tensile mean stress on fatigue behavior of single-crystal and directionally solidified superalloysTwo nickel base superalloys, single crystal PWA 1480 and directionally solidified MAR-M 246 + Hf, were studied in view of the potential usage of the former and usage of the latter as blade materials for the turbomachinery of the Space Shuttle main engine. The baseline zero mean stress (ZMS) fatigue life (FL) behavior of these superalloys was established, and then the effect of tensile mean stress (TMS) on their FL behavior was characterized. A stress range based FL prediction approach was used to characterize both the ZMS and TMS fatigue data. In the past, several researchers have developed methods to account for the detrimental effect of tensile mean stress on the FL for polycrystalline engineering alloys. These methods were applied to characterize the TMS fatigue data of single crystal PWA 1480 and directionally solidified MAR-M 246 + Hf and were found to be unsatisfactory. Therefore, a method of accounting for the TMS effect on FL, that is based on a technique proposed by Heidmann and Manson was developed to characterize the TMS fatigue data of these superalloys. Details of this method and its relationship to the conventionally used mean stress methods in FL prediction are discussed.
Document ID
19930049014
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Kalluri, Sreeramesh
(Sverdrup Technology, Inc. Cleveland, OH, United States)
Mcgaw, Michael A.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1992
Publication Information
Publication: In: Cyclic deformation, fracture, and nondestructive evaluation of advanced materials (A93-33004 12-23)
Publisher: American Society for Testing and Materials
Subject Category
Metallic Materials
Accession Number
93A33011
Funding Number(s)
PROJECT: RTOP 553-13-00
Distribution Limits
Public
Copyright
Other

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