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Micromechanical Characteristics of the Surface Layer of Metastable Austenitic Steel after Frictional Treatment

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Abstract

The effect of the frictional treatment with a sliding indenter on the micromechanical properties of the austenitic corrosion-resistant chromium–nickel AISI 321 steel (16.80 wt % Cr, 8.44 wt % Ni) has been investigated. The instrumented microindentation results, which was performed on the surface of the steel and at different depths from the surface, has shown the exponential distribution of maximum hmax and permanent hp indentation depths, Martens hardness HM, indentation hardness at the maximum load HIT, elastic reverse deformation work of indentation We, total mechanical work of indentation Wt, elastic recovery Rе, ratio of indentation hardness to contact elastic modulus НIT/Е*, power ratio \({{H_{{{\text{IT}}}}^{3}} \mathord{\left/ {\vphantom {{H_{{{\text{IT}}}}^{3}} {{{E}^{{*2}}}}}} \right. \kern-0em} {{{E}^{{*2}}}}}\), and plasticity index δA over the depth of the hardened gradient layer. In this case, the HM, HIT, We, Rе, НIT/Е*, and \({{H_{{{\text{IT}}}}^{3}} \mathord{\left/ {\vphantom {{H_{{{\text{IT}}}}^{3}} {{{E}^{{*2}}}}}} \right. \kern-0em} {{{E}^{{*2}}}}}\) values are the highest, whereas the hmax, hp, Wt, and δA values are the lowest for the steel surface. The E* contact elastic modulus of AISI 321 steel also increases after the frictional treatment. It is distributed nonmonotonously over the depth of the hardened layer. This can be explained by the formation of different dislocation structures on the steel surface and in the underlying layers. The indentation results have shown that the frictional treatment increases the resistance to mechanical action of both the steel surface and the hardened layer with a depth of to 500 µm.

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ACKNOWLEDGMENTS

Electron scanning microscopy and instrumental microindentation tests were performed at the Center of the Collaborative Access “Plastometriya,” at the Institute of Engineering Science, Ural Branch, Russian Academy of Sciences. Transmission electron microscopy examination was carried out at the Center of the Collaborative Access “Test Center of Nanotechnologies and Advanced Materials,” Institute of Metal Physics, Ural Branch, Russian Academy of Sciences.

We thank A.L. Osintseva for her participation in experimental studies.

Funding

This work was performed within the state assignment of the Institute of Engineering Science, Ural Branch, Russian Academy of Sciences (theme AAAA-A18-118020790148-1) and Institute of Metal Physics, Ural Branch, Russian Academy of Sciences (theme AAAA-A18-118020190116-6) in part of the investigated materials and selection of the treatment conditions and supported in part by the Russian Foundation for Basic Research (project no. 20-58-00057 Bel_a) to investigate micromechanical properties of the modified surface layers.

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Authors and Affiliations

  1. Institute of Engineering Science, Ural Branch, Russian Academy of Sciences, 620049, Ekaterinburg, Russia

    R. A. Savrai & Yu. M. Kolobylin

  2. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, 620108, Ekaterinburg, Russia

    E. G. Volkova

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  1. R. A. Savrai
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  2. Yu. M. Kolobylin
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  3. E. G. Volkova
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Correspondence to R. A. Savrai.

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Translated by T. Gapontseva

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Savrai, R.A., Kolobylin, Y.M. & Volkova, E.G. Micromechanical Characteristics of the Surface Layer of Metastable Austenitic Steel after Frictional Treatment. Phys. Metals Metallogr. 122, 800–806 (2021). https://doi.org/10.1134/S0031918X21080123

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