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| Description
| - The present paper gives a summary of plastic behaviour of Ms70 deep drawing cartridge brass under hot forming conditions explored using a SETARAM-Vítkovice torsion plastometer. Specimens were cut from hot-extruded and subsequently cold-drawn brass bars. Formability tests were performed on 6 mm dia specimens at 650, 700, 750, 800 and 850 °C and at the speeds of 16, 80, 400 and 800 rev x min-1. These testing conditions are equivalent to the conditions of ordinary industrial hot extrusion of brass: the single most problematic operation in the manufacturing process in terms of occurrence of serious defects. Results of torsion tests were converted into the conventional format: maximum flow stress levels vs peak strain intensity. The points thus obtained can be used for finding the activation energy for forming Q, which is useful for determining the thermally-compensated strain rate with the aid of the Zener-Hollomon Z parameter. Power dissipation maps with axes showing deformation temperature and logarithmic strain rate were computed using the dynamic material model. The calculation of dissipation efficiency was verified by comparing with known data on 30% zinc brass. Maps constructed in this manner allow data from torsion and compression plastometers to be compared. The paper also includes a discussion of changes in the processing maps at higher strains and optimum regions for hot extrusion of brass.
- The present paper gives a summary of plastic behaviour of Ms70 deep drawing cartridge brass under hot forming conditions explored using a SETARAM-Vítkovice torsion plastometer. Specimens were cut from hot-extruded and subsequently cold-drawn brass bars. Formability tests were performed on 6 mm dia specimens at 650, 700, 750, 800 and 850 °C and at the speeds of 16, 80, 400 and 800 rev x min-1. These testing conditions are equivalent to the conditions of ordinary industrial hot extrusion of brass: the single most problematic operation in the manufacturing process in terms of occurrence of serious defects. Results of torsion tests were converted into the conventional format: maximum flow stress levels vs peak strain intensity. The points thus obtained can be used for finding the activation energy for forming Q, which is useful for determining the thermally-compensated strain rate with the aid of the Zener-Hollomon Z parameter. Power dissipation maps with axes showing deformation temperature and logarithmic strain rate were computed using the dynamic material model. The calculation of dissipation efficiency was verified by comparing with known data on 30% zinc brass. Maps constructed in this manner allow data from torsion and compression plastometers to be compared. The paper also includes a discussion of changes in the processing maps at higher strains and optimum regions for hot extrusion of brass. (en)
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| Title
| - Conversion of Ms 70 Alpha Brass Torsion Test Data into Hot Forming Processing Maps
- Conversion of Ms 70 Alpha Brass Torsion Test Data into Hot Forming Processing Maps (en)
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| skos:prefLabel
| - Conversion of Ms 70 Alpha Brass Torsion Test Data into Hot Forming Processing Maps
- Conversion of Ms 70 Alpha Brass Torsion Test Data into Hot Forming Processing Maps (en)
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| skos:notation
| - RIV/26316919:_____/13:#0000494!RIV14-MSM-26316919
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| http://linked.open...avai/riv/aktivita
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| http://linked.open...avai/riv/aktivity
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| http://linked.open...iv/cisloPeriodika
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| http://linked.open...vai/riv/dodaniDat
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| http://linked.open...aciTvurceVysledku
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| http://linked.open.../riv/druhVysledku
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| http://linked.open...iv/duvernostUdaju
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| http://linked.open...titaPredkladatele
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| http://linked.open...dnocenehoVysledku
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| http://linked.open...ai/riv/idVysledku
| - RIV/26316919:_____/13:#0000494
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| http://linked.open...riv/jazykVysledku
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| http://linked.open.../riv/klicovaSlova
| - flow stress, brass, hot formability, strain rate, torsion test, power dissipation maps (en)
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| http://linked.open.../riv/klicoveSlovo
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| http://linked.open...odStatuVydavatele
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| http://linked.open...ontrolniKodProRIV
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| http://linked.open...i/riv/nazevZdroje
| - Materiali in technologie/Materials and technology
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| http://linked.open...in/vavai/riv/obor
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| http://linked.open...ichTvurcuVysledku
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| http://linked.open...cetTvurcuVysledku
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| http://linked.open...vavai/riv/projekt
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| http://linked.open...UplatneniVysledku
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| http://linked.open...v/svazekPeriodika
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| http://linked.open...iv/tvurceVysledku
| - Kubina, Tomáš
- Bořuta, J.
- Pernis, R.
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| number of pages
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