ISSN:
1662-9752
Quelle:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Thema:
Maschinenbau
Notizen:
a kind of as-cast nickel-base single crystal superalloy was TLP bonded using Ni-Cr-Bamorphous foil at different temperatures. Special attention is paid to the formation of boride indiffusion zone of TLP joints at different conditions. The chemical composition and microstructure ofborides were investigated by scanning electron microscopy (SEM) and transmission electronmicroscopy (TEM). At different bonding temperature, M3B2 precipitates appear distinctmorphologies. At 1200°C, both blocky and plate-like borides formed owing to the diffusion of boronatoms into base metal and precipitation during the cooling process. At 1230°C or above, due to thediffusion of boron atoms the constitutional liquation of original γ/γ′ eutectics in the base metal occursand borides formed when the system was cooled to room temperature. The analysis of TEM resultsreveals that M3B2 has a tetragonal structure and is rich in Mo, W, and Cr elements
Materialart:
Digitale Medien
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1245.pdf
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