NASA NTRS · 19640021087
Strength and workability of high temperature nickel-base, cobalt-base, and cobalt-refractory metal superalloys
Explore connections, maps & timelines
Freche, J. C.. 1964-10-01. Progress in superalloys. https://ntrs.nasa.gov/citations/19640021087
Cite the original work for its findings. Save a collection to share your selection of sources.
KEEP EXPLORING
Long term exposure effects under stress on supersonic transport structural materials - titanium alloys, steels, and superalloys
A program has been initiated to develop a material with superior properties at elevated temperatures for utilization in turbine blade applications. A nickel-base superalloy can provide the necessary high temperature strength by using the maximum capability of the three available strengthening mechanisms - intermetallic gamma prime precipitation (Ni3Al), solid solution strengthening with refractory and precious metals, and stable carbide formations through the addition of strong carbide forming elements. A stress rupture test at 2000 deg F and 15,000 psi was formulated to approximate the desired properties. By adding varying amounts of refractory metals (Mo, W and Ta) it was possible to statistically analyze the effects of each in a basic superalloy composition containing fixed amounts of Co, Cr, C, B, Sr, and Ni at three separate levels of AL and Ta. Metallographic analysis correlated with the mechanical properties of the alloys; those with few strengthening phases were weak and ductile and those with excessive amounts of intermetallic phases present in undesirable morphologies were brittle.
Chemical, mechanical and physical properties of cobalt-refractory-metal superalloys for high temperature aerospace applications