Effects of an Ingot Smelting Method and Pressure Treatment Modes on the Structure of Deformed TiNi-Based Alloy Semi-Finished Products

It is shown that the pressure treatment of titanium nickelide alloys should be carried out in two stages. At the first stage, ingots are deformed in order to transform the brittle cast structure, while at the second stage, the necessary shape is imparted to a semi-finished product along with the req...

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Bibliographic Details
Published in:Metallurgist (New York) 2022-07, Vol.66 (3-4), p.433-444
Main Authors: Kollerov, M. Yu, Gusev, D. E., Sharonov, A. A., Alexandrov, A. V., Afonina, M. B.
Format: Article
Language:English
Subjects:
Alloys
Characterization and Evaluation of Materials
Charge materials
Chemical composition
Chemistry and Materials Science
Deformation effects
Formability
Ingot casting
Ingots
Intermetallic compounds
Material properties
Materials Science
Melting
Metallic Materials
Metallurgy
Methods
Nickel base alloys
Nickel compounds
Nickel titanides
Polygonization
Recrystallization
Shape effects
Shape memory alloys
Skull melting
Smelting
Specialty metals industry
Titanium compounds
Titanium sponge
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Summary:It is shown that the pressure treatment of titanium nickelide alloys should be carried out in two stages. At the first stage, ingots are deformed in order to transform the brittle cast structure, while at the second stage, the necessary shape is imparted to a semi-finished product along with the required structure and material properties. The deformability of TiNi alloy ingots largely depends on the content of impurities and the uniformity of a chemical composition, which is determined by the purity of a charge material and the smelting method. The deformability can be increased on the basis of using a titanium sponge in terms of a charge and smelting ingots either by an induction method in a cold crucible unit or by the combination of skull melting with subsequent vacuum-arc remelting. At the second pressure treatment stage during the acquisition of deformed semi-finished products with the required structure and shape memory effect properties, it is necessary to consider temperature-time conditions for the development of polygonization and recrystallization processes, as well as the precipitation of Ni-rich Ti 3 Ni 4 intermetallics.
ISSN:0026-0894
1573-8892
DOI:10.1007/s11015-022-01344-9