The structure and properties of hardened stainless steels with a shape memory effect

Abstract

A possibility of obtaining the shape memory effect has been investigated as a result of γ→ε→γ transformations in stainless steels hardened by VC carbides. Age hardening conditions at 650 and 720 °C for stainless steels containing (in mass %) 0.20 -0.35 C, 1 V, 3 -4 Si, 9 and 13 -14 Cr are presented. The values of reversible strain e determined after heating to 400 °C in specimens preliminarily deformed by 3.5 -4 % vary from 0.15 to 2.7 % depending on the composition of the steels and the conditions of stabilizing and destabilizing aging. Sagaradze V.V., Mukhin M.L., Belozerov E.V., Zainutdinov Yu.R., Pecherkina N.L., Filippov Yu.I. Controlled shape memory effect in high strength Mn and Cr-Mn steels. Materials Science and Engineering: A, 2008, vol. 481-482, pp. 742-746. DOI:10.1016/j.msea.2007 Sagaradze V.V., Kositsyna I.I., Muкhin M.L., Belozerov E.V., Zaynutdinov Yu.R. Highstrength precipitation-hardening austenitic Fe-Mn-V-Mo-C steels with shape memory effect. Sagaradze V.V., Voronin V.I., Filippov Yu.I., Kazantsev V.A., Mukhin M.L., Belozerov E.V., Pecherkina N.L., Kataeva N.V., Popov A.G. Martensitic transformations γ-ε(α) and the shape-memory effect in aging high-strenght manganese austenitic steels. The Physics of Metals and Metallography, 2008, vol. 106, iss.6, pp 630-640. DOI: 10.1134/S0031918X08120120. 6. Sagaradze V. V., Afanas'ev S. V., Kataeva N. V. Shape memory effect in Mn-V-C austenitic steels involving deformation reorientation of ε-martensite. The Physics of Metals and Metallography, 2013, vol. 114, iss. 4, pp. 322-326 Baruj A., Kikuchi T., Kajivara S., Shinya N. Improved shape memory properties and internal structures in Fe-Mn-Si-based alloys containing Nb and C.