The Structure and Properties Formation of the NiTi Shape Memory Rods after Hot Rotary Forging

Zdzisław Lekston , Maciej Zubko , Józef Lelątko , Danuta Stróż , Tomasz Goryczka , Tadeusz Wierzchoń , Jan Sieniawski , Jerzy Dybich

Abstract

Shape memory effects, the course and characteristic temperatures of phase transitions and mechanical properties and surface properties of NiTi alloys strongly depend on the chemical composition, the production process used and the plastic working and thermomechanical treatment as well as surface treatment. The test alloy was obtained by vacuum metallurgy by melting the components in a graphite crucible and casting into a graphite ingot mould. In order to obtain the rods in the process of hot plastic working, hot forging was applied using a smith hammer and rotary hot forging on a swaging machine. The resulting rods were subjected to an appropriate heat treatment and thermo mechanical treatment to obtain, at room temperature, a parent phase structure B2.The paper presents the results of the research of NiTi rods after hot rotary forging. The phase composition of the samples of the tested alloy after different heat treatments were determined by X-ray powder diffraction technique. It was found that at room temperature, depending upon the processing the samples had a structure parent phase with a small amount of martensite. The courses of phase transitions and the changes of the temperature characteristic were determined on the basis of the recorded DSC curves. It was found that the test rate after aging in the temperature range of 400-500 °C transitions take place involving the rhombohedral R phase. The temperature ranges of shape recovery of samples after various heat treatments were determined by recording the recovery of the shape during heating, in tests performed according to the standard ASTM 2082-06.
Author Zdzisław Lekston - University of Silesia (UŚ) [University of Silesia in Katowice]
Zdzisław Lekston,,
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, Maciej Zubko - University of Silesia (UŚ) [University of Silesia in Katowice]
Maciej Zubko,,
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, Józef Lelątko - University of Silesia (UŚ) [University of Silesia in Katowice]
Józef Lelątko,,
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, Danuta Stróż - University of Silesia (UŚ) [University of Silesia in Katowice]
Danuta Stróż,,
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, Tomasz Goryczka - University of Silesia (UŚ) [University of Silesia in Katowice]
Tomasz Goryczka,,
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, Tadeusz Wierzchoń (FMSE / DSE)
Tadeusz Wierzchoń,,
- Division of Surface Engineering
, Jan Sieniawski - Rzeszów University of Technology (PRz) [Rzeszów University of Technology (PRz)]
Jan Sieniawski,,
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- Politechnika Rzeszowska im. Ignacego Łukasiewicza
, Jerzy Dybich - BHH Mikrohuta Sp. z o.o. [BHH Mikrohuta sp. z o.o.]
Jerzy Dybich,,
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Journal seriesKey Engineering Materials, ISSN , e-ISSN 1662-9795
Issue year2016
Vol687
Pages11-18
Publication size in sheets0.5
Keywords in EnglishNiTi alloys; shape memory effect; plstic processing; phase transformations; shape recovery;
DOIDOI:10.4028/www.scientific.net/KEM.687.11
URL https://www.scientific.net/KEM.687.11
Languageen angielski
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The structure and properties formation of the NiTi shape memory rods after hot rotary forging.pdf 4.34 MB
Score (nominal)0
Score sourcejournalList
ScoreMinisterial score = 0.0, 09-01-2020, ArticleFromJournal
Ministerial score (2013-2016) = 0.0, 09-01-2020, ArticleFromJournal
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