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Influence of composition on the microstructure and mechanical properties of a nickel-base superalloy single crystal

Author
Nathal, M. V.
Published
JAN 1, 1984.
Physical Description
1 electronic document
Additional Creators
Ebert, L. J.
Online Version

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Summary
The effects of cobalt, tantalum, and tungsten contents on the microstructure and mechanical properties of single crystal Mar-M247 were investigated. Elevated temperature tensile and creep-rupture properties of 001 oriented single crystals were related to microstructural features of the alloys. Substitution of Ni for Co in the high refractory metal alloys increased the lattice mismatch, which was considered to be the cause of the increases in tensile and creep strength. Substitution of Ni for Ta caused large decreases in tensile strength and creep life, consistent with decreases in gamma prime volume fraction, lattice mismatch, and solid solution hardening. Substitution of W for Ta resulted in decreased life at high stresses, which was related to small decreases in mismatch and volume fraction. However, the W substitution resulted in improved life at low stresses, which was related to solid solution strengthening by W.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19840009286.
Accession ID: 84N17354.
NAS 1.15:83563.
NASA-TM-83563.
E-1942.
Intern. Symp. on Superalloys; 7-11 Oct. 1984; Seven Springs, PA; United States.
Terms of Use and Reproduction
No Copyright.
View MARC record | catkey: 15708863