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Anisotropy of high temperature strength in precipitation-hardened nickel-base superalloy single crystalsThe anisotropy of high temperature strength of nickel-base superalloy, Alloy 454, in service for advanced jet engine turbine blades and vanes, was investigated. Crystallographic orientation dependence of tensile yield strength, creep and creep rupture strength was found to be marked at about 760C. In comparison with other single crystal data, a larger allowance in high strength off-axial orientation from the 001 axis, and relatively poor strength at near the -111 axis were noted. From transmission electron microscopy the anisotropic characteristics of this alloy were explained in terms of available slip systems and stacking geometries of gamma-prime precipitate cuboids which are well hardened by a large tantalum content. 100 cube slip was considered to be primarily responsible for the poor strength of the -111 axis orientation replacing the conventional 111 plane slip systems.
Document ID
19860015344
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Nakagawa, Y. G. (NASA Headquarters Washington, DC United States)
Terashima, H. (NASA Headquarters Washington, DC United States)
Yoshizawa, H. (NASA Headquarters Washington, DC United States)
Ohta, Y. (NASA Headquarters Washington, DC United States)
Murakami, K. (NASA Headquarters Washington, DC United States)
Date Acquired
September 5, 2013
Publication Date
March 1, 1986
Publication Information
ISSN: 0578-7904
Subject Category
Metallic Materials
Report/Patent Number
NAS 1.15:88387
NASA-TM-88387
Accession Number
86N24815
Funding Number(s)
CONTRACT_GRANT: NASW-4005
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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