Investigation shows that there is a preferred cobalt content for a given hardness of a cemented carbide insert when used in a bit which is drilling iron ore. Two parameters determine the hardness of a cemented carbide: cobalt percent and tungsten carbide grain size. By manipulating these two parameters, a number of cemented carbide materials can be made which have the same hardness. Three iron-ore drilling tests have been conducted where test bits contained materials having essentially the same hardness, but where the materials were varied through a range of cobalt content and tungsten carbide grain size. Graphs are presented which depict the effect on fracture resistance of varying the cobalt content-tungsten carbide grain size. In each test, one material showed superior fracture resistance. The test bits drilled iron ores such as hematite or taconite.
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February 1978
Research Papers
Increasing the Fracture Resistance of Cemented Carbides During the Drilling of Iron Ores
J. Peck
J. Peck
Reed Tool Company, Houston, Tex.
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J. Peck
Reed Tool Company, Houston, Tex.
J. Pressure Vessel Technol. Feb 1978, 100(1): 74-76 (3 pages)
Published Online: February 1, 1978
Article history
Received:
June 9, 1977
Online:
October 25, 2010
Citation
Peck, J. (February 1, 1978). "Increasing the Fracture Resistance of Cemented Carbides During the Drilling of Iron Ores." ASME. J. Pressure Vessel Technol. February 1978; 100(1): 74–76. https://doi.org/10.1115/1.3454437
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