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 development of Fe-based metal matrix composites (MMCs) with high content ofhard phase has been approached by combining the use of advanced powder metallurgy techniqueslike high-energy milling (HEM), cold isostatic pressing (CIP) and vacuum sintering. The mostinnovative is the use of HEM for the obtaining of a composite powder avoiding the formation ofclusters in the microstructure of the sintered material, and the study of hardenability of sinteredmaterials. A 30 % vol. of NbC particles was mixed with Fe powder by HEM in a planetary millunder Ar atmosphere to prevent oxidation. The optimal milling time was determined by samplingevery two hours until 10 hours of milling, characterising the powder by the observation ofmorphology and microstructure by scanning electron microscopy (SEM), and controlling the carboncontent by a LECO analyser. Composite powders were compacted by CIP and then sintered invacuum at temperatures between 1300 ºC and 1375 ºC, during 30 min and 60 min. The variation ofdensity, hardness and carbon content with sintering temperature and time, besides themicrostructural changes observed, permits to find the optimal conditions of processing. Afterwards,a heat treatment study was performed to study the hardenability of the cermet
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.534-536.637.pdf
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