Precipitation-hardening stainless steels with a shape-memory effect

Abstract

The possibility of obtaining the shape memory effect as a result of the γ → ε → γ transformations in aging stainless steels strengthened by VC carbides has been investigated. Regimes are given for strengthen ing aging (at 650 and 720°C) for stainless steels that predominantly contain (in wt %) 0.06-0.45C, 1-2V, 2-5Si, 9 and 13-14Cr. The values of reversible deformation e (amount of shape memory effect) determined after heating to 400°C in samples preliminarily deformed to 3.5-4% vary from 0.15 to 2.7%, depending on the composition of the steels and regimes of stabilizing and destabilizing aging.

Key Factors Achieving Large Recovery Strains in Polycrystalline Fe–Mn–Si‐Based Shape Memory Alloys: A Review

“…Later, the precipitates, such as VN, Cr 23 C 6 , χ ‐phase, TiC, (Fe, Mn) 3 Si, VC, and π ‐phase were devloped to improve the SME of Fe – Mn – Si‐based SMAs. Wen et al comfirmed that lots of aligned Cr 23 C 6 particles were precipitated in the Fe–13.53Mn–4.86Si–8.16Cr–3.82Ni–0.16C alloy subjected to ageing at 1073 K after 10% tensile deformation at RT (Figure ) .…”