Development of new methods for studying the decomposition in aging invars

• Published in: Russian metallurgy Metally Vol. 2014; no. 7; pp. 537 - 543
• Main Authors: Uvarov, A. I., Sandovskii, V. A., Anufrieva, E. I., Vil’danova, N. F., Filippov, Yu. I.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.07.2014; Springer Nature B.V
• Subjects: Alloys; Chemistry and Materials Science; Decomposition; Ferrous alloys; Low expansion alloys; Materials Science; Metallic Materials; Metallurgy; Phase shift; Plastic deformation; Resistivity; Martensitic Transformation; Magnetic Susceptibility; Martensite; Austenite; Aging Temperature
• ISSN: 0036-0295; 1555-6255; 1531-8648
• DOI: 10.1134/S0036029514070131

N30K10T3 and N28K10T3 invar alloys are studied. After water quenching from 1150°C, they consist of supersaturated solid solutions, which can decompose in aging in the temperature range 500–700°C with the precipitation of intermetallic Ni 3 Ti nanoparticles. It is shown that the decomposition can be controlled by measuring the magnetic (first harmonic amplitude, phase angle φ shift, magnetic susceptibility μ) and electric (electrical conductivity σ) parameters as functions of the isothermal holding time at various aging temperatures. The alloys are studied in the following three initial states: after quenching, phase transformation-induced hardening (γ → α → γ pt ), and cold (20°C) plastic deformation by 30%.