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Thermal-fatigue and oxidation resistance of cobalt-modified udimet 700 alloy
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Bizon, P. T. Barrow, B. J. |
| Copyright Year | 1986 |
| Description | Comparative thermal-fatigue and oxidation resistances of cobalt-modified wrought Udimet 700 alloy (obtained by reducing the cobalt level by direct substitution of nickel) were determined from fluidized-bed tests. Bed temperatures were 1010 and 288 C (1850 and 550 C) for the first 5500 symmetrical 6-min cycles. From cycle 5501 to the 14000-cycle limit of testing, the heating bed temperature was increased to 1050 C (1922 F). Cobalt levels between 0 and 17 wt% were studied in both the bare and NiCrAlY overlay coated conditions. A cobalt level of about 8 wt% gave the best thermal-fatigue life. The conventional alloy specification is for 18.5% cobalt, and hence, a factor of 2 in savings of cobalt could be achieved by using the modified alloy. After 13500 cycles, all bare cobalt-modified alloys lost 10 to 13 percent of their initial weight. Application of the NiCrAlY overlay coating resulted in weight losses of 1/20 to 1/100 of that of the corresponding bare alloy. |
| File Size | 6597764 |
| Page Count | 20 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19860018992 |
| Archival Resource Key | ark:/13960/t6741ns7x |
| Language | English |
| Publisher Date | 1986-04-01 |
| Access Restriction | Open |
| Subject Keyword | Structural Mechanics Fatigue Life Nickel Alloys Udimet Alloys Thermal Resistance Heat Resistant Alloys Fluidized Bed Processors High Temperature Tests Oxidation Thermal Fatigue Protective Coatings Cobalt Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
