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Talks and Poster Presentations (with Proceedings-Entry):

C. Buchegger, W. Lengauer:
"Creep Behaviour of Hardmetals with Alternative Binder Alloys at Elevated Temperatures";
Poster: 18. Plansee Seminar 2013, Reutte; 06-03-2013 - 06-07-2013; in: "Proceedings", (2013), 1 - 9.



English abstract:
For characterising the creep behaviour of hardmetals a device analogous to a three-point bending test was constructed. The apparatus consists of a vertical silica tube which is enclosed by two stainless steel flanges. The inner parts are fabricated of graphite which is creep resistant at the test temperatures. The creep rate is measured in real time by a laser distance sensor. The setup was tested successfully for temperatures up to 800C. The creep of hardmetals with alternative Fe/Co/Ni and Fe/Ni binder alloys was determined and compared to a conventional WC-Co grade. At temperatures between of 600 and 725C the creep rate was measured for various stress levels in a range of 0.4 - 1.2 GPa. From these data creep parameters were estimated by a semi-empirical model. Activation energies between 235 and 320 kJ/mol were determined. The evaluated Norton exponents of 3 - 6 indicate power-law creep at the testing conditions.

German abstract:
For characterising the creep behaviour of hardmetals a device analogous to a three-point bending test was constructed. The apparatus consists of a vertical silica tube which is enclosed by two stainless steel flanges. The inner parts are fabricated of graphite which is creep resistant at the test temperatures. The creep rate is measured in real time by a laser distance sensor. The setup was tested successfully for temperatures up to 800C. The creep of hardmetals with alternative Fe/Co/Ni and Fe/Ni binder alloys was determined and compared to a conventional WC-Co grade. At temperatures between of 600 and 725C the creep rate was measured for various stress levels in a range of 0.4 - 1.2 GPa. From these data creep parameters were estimated by a semi-empirical model. Activation energies between 235 and 320 kJ/mol were determined. The evaluated Norton exponents of 3 - 6 indicate power-law creep at the testing conditions.

Keywords:
Hardmetal, cemented carbide, creep, tungsten carbide, alternative binder, three-point bending, Norton exponent, activation energy

Created from the Publication Database of the Vienna University of Technology.