Full Content is available to subscribers

Subscribe/Learn More  >

Effect of Mechanical Alloying and Equal Channel Angular Extrusion Consolidation on the Structure and Properties of Tungsten Carbide-Cobalt Alloy

[+] Author Affiliations
Malur N. Srinivasan

Lamar University, Beaumont, TX

Kannan Ramakrishnan

Fluor Enterprises, Houston, TX

Paper No. IMECE2010-37768, pp. 851-855; 5 pages
  • ASME 2010 International Mechanical Engineering Congress and Exposition
  • Volume 3: Design and Manufacturing, Parts A and B
  • Vancouver, British Columbia, Canada, November 12–18, 2010
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4427-4
  • Copyright © 2010 by ASME


Tungsten carbide-cobalt (WC-Co) materials are widely used today in the area of heavy duty machining (tool bits), in cold-forming dies and in the oil field industry (drill bits). Limited ductility is exhibited by conventionally produced WC-Co parts because of the presence of a high volume fraction of coarse WC particles in a soft cobalt matrix. Recent investigations have indicated that nanostructured WC-Co parts can attain up to twice the hardness values of conventional parts with coarse microstructure. With this background in view, the authors conducted an investigation to produce nanostructured WC-Co powder using mechanical alloying in an attritor and consolidate the powder through equal channel angular extrusion (ECAE) rather than conventional powder metallurgy technique, into bulk billets. An experimental plan based on 23 factorial experimental design was used to determine the effect of mechanical alloying variables, namely, milling time, milling speed and ball-to-powder ratio on the microhardness of billets produced using ECAE. The significance of these variables was examined with respect to the average microhardness of annealed WC-Co samples. The combination of the variables that was most beneficial to the formation of desired microstructure (nanocrystalline) and good hardness was then established. X-ray diffraction and scanning electron microscope (SEM) analysis were performed to determine the composition and grain size to give a better insight into the microstructure developed under different combination of the variables. It is hoped that the results of this investigation will help to develop the technology to produce superior quality WC-Co parts such as inserts, seats and dies required by the oil tool industry.

Copyright © 2010 by ASME



Interactive Graphics


Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In