Keywords and Phrases
"In an effort to improve the performance of petroleum drill bits produced by Smith Bits (a division of Smith International, Inc., Houston, TX), a series of cemented carbide materials with an engineered architecture were developed. This engineered architecture is comprised of a brittle wear resistant WC-Co cell surrounded by a ductile cobalt cell boundary. This structure is meant to mitigate catastrophic failure of the cemented carbide inserts on petroleum drill bits. In a lab it is difficult to simulate the conditions of drilling in the earth, thus several tests were employed to characterize the mechanical and wear behavior of the materials and determine their viability for use in the petroleum drilling industry. The tests utilized in this study were transverse rupture strength (TRS), fracture toughness using a chevron notched beam, high stress wear resistance (ASTM B611), and low stress wear resistance (ASTM G65). The strength results were examined, and with the aid of object oriented finite element (OOF) analysis, the strength was determined to be controlled by the tensile weakened cobalt cell boundary. The composites exhibited equivalent or higher fracture toughness over monolithic cemented carbides with equivalent cobalt content when tested in certain orientations. The wear resistance of the composite materials was improved over monolithic cemented carbides with equivalent quantities of cobalt"--Abstract, page iv.
Newkirk, Joseph William
Materials Science and Engineering
M.S. in Ceramic Engineering
University of Missouri--Rolla
Journal article titles appearing in thesis/dissertation
- Functionally designed cemented carbides
- Wear characteristics of functionally designed cellular Cemented carbides produced by coextrusion
- Strength of functionally designed cellular cemented carbides produced by coextrusion
xiv, 141 pages
© 2004 Sean E. Landwehr, All rights reserved.
Thesis - Restricted Access
Tungsten carbide-cobalt alloys
Print OCLC #
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Link to Catalog Record
Electronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.http://laurel.lso.missouri.edu/record=b5407102~S5
Landwehr, Sean E., "Processing and characterization of functionally designed cellular cemented carbides" (2004). Masters Theses. 3647.
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