Email this article THERMOELASTIC MARTENSITE TRANSFORMATIONS IN SINGLE-CRYSTALS OF Fe–Ni–Co–Al–Nb(B) FERRUM-BASED ALLOYS AT THE LONG TIME OF AGENING
- Authors: Panchenko M.Y.1, Kuts O.A.1, Kireeva I.V.1, Chumlyakov Y.I.1
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Affiliations:
- National Research Tomsk State University, Tomsk
- Issue: No 2 (2016)
- Pages: 52-58
- Section: Technical Sciences
- URL: https://vektornaukitech.ru/jour/article/view/305
- DOI: https://doi.org/10.18323/2073-5073-2016-2-52-58
- ID: 305
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Abstract
The authors studied the development of thermoelastic martensite transformation from FCC-γ of high-temperature phase to OCT-α¢ martensite after the aging at 973 K during 20 hours on the single-crystals of Fe – 28 % Ni – 17 % Co – 11.5 % Al – 2.5 % Nb (Nb) and Fe – 28 % Ni – 17 % Co – 11.5 % Al – 2.5 % Nb – 0.05 % B (NbB) (at. %) alloys oriented for the extension along [001]-direction. It is shown that boron causes: the retardation of the aging processes: in NbB-crystals, the particles of γ¢-phase have the size of 12–14 nm and in Nb-crystals – 18–25 nm; the decrease of Ms onset temperature of the martensite transformation: Ms=108 K in NbB-crystals and Ms=116 K in Nb-crystals; the increase of the stress level at the temperature Ms: at Ms temperature, the stresses are equal to 70 MPa in NbB-crystals and 31 MPa in Nb-crystals. The level of stresses of high-temperature phase is determined by the size of γ¢-phase particles: in Nb-crystals with bigger size of γ¢-phase particles, the high-temperature stresses are higher than in NbB-crystals where γ¢-phase particles have the smaller size.
When developing thermoelastic γ–α¢ martensite transformation under the load, in Nb- and NbB-crystals after the aging during twenty hours at 973 K, the form memory effect of 2.6 % and 2.2 % respectively was observed, and the superelasticity was not observed. It is shown that the physical reason for the superelasticity absence in Nb-crystals is caused by the brittle β-phase that results into the crystals destruction at the beginning of γ–α¢-MT under the load and in NbB-crystals – by the increase of mechanical hysteresis.
About the authors
Marina Yurievna Panchenko
National Research Tomsk State University, Tomsk
Author for correspondence.
Email: panchenko.marina4@gmail.com
student
Russian FederationOlga Anatolievna Kuts
National Research Tomsk State University, Tomsk
Email: bolga@sibmail.com
postgraduate student
Russian FederationIrina Vasilievna Kireeva
National Research Tomsk State University, Tomsk
Email: kireeva@spti.tsu.ru
Doctor of Sciences (Physics and Mathematics), chief researcher
Russian FederationYuriy Ivanovich Chumlyakov
National Research Tomsk State University, Tomsk
Email: chum@phys.tsu.ru
Doctor of Sciences (Physics and Mathematics), Professor
Russian FederationReferences
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