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Eswara Prasad DMSRDE, DRDO, Kanpur, India © Springer Science+Business Media Singapore 2017 N. H. 1007/978-981-10-2143-5_2 25 26 S. Narahari Prasad et al. The plastic flow properties are influenced by factors such as selection of tool geometry, equipment, tool and die material; and processing conditions such as workpiece, die temperatures and lubrication. Because of the complexity of deformation processes, analytic, physical or numerical models are relied on to aid in designing such processes to ensure the reproducibility of physical and mechanical properties.
Greater strength to weight ratio. 2. Elimination of welding: Switching to closed-die forging from multipart welding leads to cost reduction, in addition to property improvement. 3. Reduced inspection and testing: As there are no welds, inspection is easier. 4. Replacing assemblies, fabrications: cost saving is usually achieved when forgings replace complex fabrications and assemblies. 5. There is no doubt that precision forging is more economical than fabricating metal components by extensive machining, particularly when the parts requirement is large.
Oxidation loss of elements such as Ti, Zr, Al and Si is almost completely avoided. This is important when remelting high Al + Ti-containing superalloys with narrow compositional ranges. • Possibly better cleanliness of remelted ingots. • Better retention of microadditions that have beneﬁcial influences on material performance during subsequent processing. 14 M. Chatterjee et al. B. Vacuum Arc Remelting (VAR) Reﬁning phenomena in the VAR process are primarily governed by exposure of the molten metal in vacuo to very high arc temperatures.