Effect of the structure of aging invars with a metastable austenite on the frequency dependence of their magnetic permeability

• Published in: Russian metallurgy Metally Vol. 2008; no. 4; pp. 347 - 353
• Main Authors: Uvarov, A. I., Sandovskii, V. A., Vil’danova, N. F., Anufrieva, E. I.
• Format: Journal Article
• Language: English
• Published: Dordrecht SP MAIK Nauka/Interperiodica 01.08.2008; Springer Nature B.V
• Subjects: Austenite; Chemistry and Materials Science; Electromagnetism; Ferromagnetism; Ferrous alloys; Low expansion alloys; Magnetic permeability; Martensite; Martensitic transformations; Materials Science; Metallic Materials; Permeability; Solid solutions; Studies; Transformations; 07.55.-w; 61.66.-f
• ISSN: 0036-0295; 1555-6255; 1531-8648
• DOI: 10.1134/S0036029508040137

The effect of the generator current frequency f on the magnetic permeability μ of the N30K10T3 invar is studied for its various structural states formed upon the following treatments: phase naklep (i.e., the phase-transformation-induced hardening of austenite), cold plastic deformation, and cooling in liquid nitrogen. The ferromagnetic austenite of the alloy is metastable with respect to the γ → α martensite transformation upon cooling to temperatures below the temperature of the onset of the martensite transformation ( M s ≈ −80°C) and represents a supersaturated solid solution ageable during heating. The types of treatment are shown not to change the linear character of the μ( f ) dependence in the frequency range under study (15–50 kHz) and to decrease μ to a certain extent.