The influence of prior deformation on phase composition and strength properties of austenitic stainless steel in ion-plasma treatment

V.A. Moskvina, E.G. Astafurova, K.N. Ramazanov, G.G. Maier, S.V. Astafurov, M.Y. Panchenko, E.V. Melnikov, Y.P. Mironov, E.A. Zagibalova show affiliations and emails
Received 17 May 2019; Accepted 09 June 2019;
Citation: V.A. Moskvina, E.G. Astafurova, K.N. Ramazanov, G.G. Maier, S.V. Astafurov, M.Y. Panchenko, E.V. Melnikov, Y.P. Mironov, E.A. Zagibalova. The influence of prior deformation on phase composition and strength properties of austenitic stainless steel in ion-plasma treatment. Lett. Mater., 2019, 9(4) 377-381
BibTex   https://doi.org/10.22226/2410-3535-2019-4-377-381

Abstract

Surface hardening of specimens of 316L-type austenitic stainless steel during ion-plasma treatment strongly depends on its initial microstructure.The effect of pre-deformation by cold-rolling on phase composition and nanohardness of a surface layer and resultant tensile properties of Fe-17Cr-13Ni-2.7Mo-1.7Mn-0.6Si-0.01C (wt.%, 316L-type) austenitic stainless steel subjected to an ion-plasma treatment was investigated. The ion-plasma treatment facilitates a formation of inhomogeneous surface layers of ≈18 – 25 μm in thickness in steel specimens. Independently of type of initial microstructure, coarse-grained or highly defective deformation-associated one, the surface layers of the steel specimens undergo similar phase transformations under ion-plasma treatment. Solid-solution strengthening of austenite (Fe-γN, C) and dispersion hardening by different phases (Fe4(N, C), Cr(N, C), Fe- αN, C) both increase surface nanohardness and tensile strength characteristics of austenitic stainless steel. X-ray diffraction data show that morphology and distribution of dispersed phases in the surface layers could be strongly dependent on prior microstructure of the steel. In ion-plasma treatment, specimens with coarse-grained structure are prone to accumulate and save interstitials in austenite (solid-solution). After surface treatment, higher strength properties (nanohardness) of the composition layer and more extended diffusion zone both provide higher tensile strength characteristics of pre-deformed specimens as compared to coarse-grained one. The experimental results clearly show that surface hardening of specimens of 316L-type austenitic stainless steel during ion-plasma treatment strongly depends on its initial microstructure.

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Funding

1. Fundamental Research Program of the State Academies of Sciences for 2013-2020 - line of research III.23.2.7