ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The effects of high temperature exposure simulating service conditions on stress ruptureproperties were studied for the second generation single crystal superalloy DD6. The specimens with[001] orientation were exposed in air at temperatures of 980°C and 1070°C for 100h to 1000h. Theywere then tested using conventional mechanical tests at 1070°C/140MPa to determine the effects ofexposure on stress rupture properties. The analysis indicated that stress rupture life decreased withincreasing exposure time. At the temperature of 980°C, the stress rupture life is more than 180h afterexposure for 1000h. When the test temperature increased to 1070°C, the stress rupture life exceeds100h after 800h exposure. The morphology of γ prime phase after exposure was observed by usingscanning electron microscopy (SEM). Morphologies evaluations have shown that alloy DD6 exhibitsexcellent microstructure stability after exposure. TCP (Topologically Closed Packed) phases have notbeen observed. It has been also found that the morphology and size of γ prime affected stress rupturelife of the alloy. The decrement in stress rupture life with increasing exposure is a result of γ primerafting
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1249.pdf
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