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The fracture toughness of cemented tungsten carbides

✍ Scribed by N Ingelstrom; H Nordberg

Publisher
Elsevier Science
Year
1974
Tongue
English
Weight
800 KB
Volume
6
Category
Article
ISSN
0013-7944

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✦ Synopsis

The fracture toughness of a number of cemented carbide alloys have been determined; using a wedge-impact method for precracking. The materials were of WC-Co type with cobalt content ranging from 6 to 25 wt-% and mean carbide grain size between 1.0 and 3.3 pm. Within the investigated composition range the fracture toughness decreases almost linearly with increasing hardness of the materials from 20.3 MN/n"' at 800 HV (25 wt-% Co) to 9.8 MN/m3" at 1700 HV (6 wt-% Co). The standard deviations determined from more than 20 tests were 0.7 and O-3 MN/m3'* respectively.

The fracture toughness increases with increasing carbide grain size.

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