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| Kvačkaj T., Pokorný I., Vlado M. |
| SIMULATION OF FORMING PROCESSES BY TORSION TESTS |
| Keywords: flow stress|torsion test|hot workability|electrotechnical steel|low carbon steel|structural development|static recrystallization| |
| No 3 (2000), p. 242-248 |
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| Bednarczyk J., Głuch G. |
| ELECTRODYNAMIC METAL FORMING |
| Keywords: electromagnetic forming of metals|high velocity forming|high energy-rate forming| |
| No 3 (2000), p. 270-278 |
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| Sinka V. |
| SEMISOLID METAL FORMING - PROCESSING CHARACTERISTICS |
Abstract
Production of structural parts with complex shape from aluminium alloys via semisolid metal forming is an alternative to conventional die casting or forging. Thixoformed products exhibit better ductility and fatigue resistance while such typical casting defects as e.g. air bubbles and the problematic manipulation with the liquid metal can be eliminated. The most important processing parameters include shear strain rate, heating rate, forming pressure, mould/die temperature which have to be strictly controlled because of the narrow temperature interval of the coexistence of liquid and solid phases. Semisolid forming may resemble injection moulding for lower solid phase fractions (slurries), denominated as thixocasting. In case of a mushy feedstock with a higher solid volume fraction the thixoforging forming process is applied. The precondition for a successful forming operation is nondendritic solid phase particle shape in the feedstock, which may be produced by rheocasting or via strain induced melt activation (SIMA process). In industrial scale both the production of the semisolid material and the proper forming process requires a high degree of computer control and automation.
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| Keywords: thixoformimg|thixocasting|thixoforging|SIMA process|nondendritic material| |
| No 3 (2000), p. 288-293 |
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