ISSN:
1013-9826
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 mechanism of the degradation process of nickel based superalloy CM247LC undercreep loading was analyzed by considering the microscopic chemical composition of the materialsuch as phase boundary of γ and γ’ phases.In this study, a Directionally Solidified (DS) nickel-based superalloys CM247LC was used as testspecimens. The creep test was performed at 900oC under an uni-axial stress of 216 MPa. Eachspecimen was creep ruptured and interrupted at different hours and then analyzed.The change of chemical composition around the interface analyzed precisely by used AugerElectron Spectroscopy (AES). It was found that the local enrichment or lack of cobalt andchromium was found at the interface. This tendency was not found in the stress free area. Sincechromium is the well-known element that dominates the degradation of this material, such anenrichment or lack of cobalt and chromium may play an important role for forming a crackpropagation path near the interface. This local segregation should be analyzed further to make cleardegradation mechanism of this material
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.537.pdf
