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 ruthenium and chromium contents have been investigated on phasetransformation temperatures and the morphology of γ’ precipitates as well as microstructural stabilityin high refractory Ni-base superalloys. The solidus and liquidus temperatures were determined bydifferential scanning calorimetry (DSC), suggesting that the addition of Cr resulted in a decrease insolidus/liquidus temperatures while the Ru addition (3.5 at.%) had the neutral effect. The morphologyof γ’ precipitates in the heat-treated microstructure was changed under the influence of the Cr and Ruadditions, suggesting that Ru and Cr contents affected the γ−γ’ lattice misfit through changes in theassociated partitioning to the constituent phases. The microstructural instability has been investigatedat 1000 oC. High levels of Cr addition (8 at.%) strongly promoted the formation of TCP phases, whileRu improved the microstructural stability to some extent
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1207.pdf
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