Change in the modulus of elasticity of the surface nanostructured layer on U8 steel

Keywords

surface nanocrystalline structure, mechanical pulse treatment, modulus of elasticity, Oliver–Pharr indentation method, electron configuration of the nanostructure.

Cite as

Kyryliv V. I., Zakiev V. I., and Maksymiv O. V. Change in the modulus of elasticity of the surface nanostructured layer on U8 steel. Physicochemical Mechanics of Materials. 2022. 58(6), 103-107.

Abstract

The change of elasticity modulus of surface nanocrystalline structure, formed by mechanical-pulse treatment on U8 steel has been studied by Oliver–Pharr indentation method. Its increment by 17% compared with matrix structure is shown. This is explained by the change of electron configuration of iron, namely by increase in the contribution of d-orbitals into metallic bond due to the influence of high pressure under treatment, thus confirming the theory about higher interaction between atoms inside the metal and its weakening on the surface. The inverse relationship between module of elasticity and friction coefficients for different metals is shown.

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