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The Influence of the Final Machining Process on the Change of the Microstructure in the Surface Region of Austenitic Stainless Steels

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Abstract:

Austenitic stainless steels (ASSs) are characteristic with a combination of good mechanical and corrosion properties. Therefore, they are used in the primary circuits of nuclear power plants. Under the influence of a corrosive environment containing chloride ions and mechanical loading, the phenomenon of stress corrosion cracking occurs in ASSs. SCC can also be initiated by the surface condition of ASSs. Machining is usually the last stage of production, during which a significant deformed zone with high residual tensile stresses can be created, which can accelerate the initiation of stress corrosion cracking. Research is focused on analyzing the influence of final turning on microstructural changes of the surface-machined layer caused by various turning parameters (e.g.: cutting speed, feed, depth of cut, cutting tool geometry). No significant microstructure changes were observed between the samples by light microscopy, so we focused on transmission electron microscopy (TEM) on thin lamellas prepared using the focus ion beam (FIB) technique. TEM observation confirmed the presence of a deformed zone and a passivation layer. In the case of the sample that was turned with a higher feed and cutting speed, the passivation layer was discontinuous. Such a microstructural change can significantly affect the corrosion resistance of ASS.

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Periodical:

Defect and Diffusion Forum (Volume 448)

Pages:

119-124

DOI:

https://doi.org/10.4028/p-hkPl0d

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Online since:

March 2026

Authors:

Katarína Bártová*, Marek Kudláč, Mária Dománková, Tomáš Vopát, Matúš Gavalec, Dávid Slnek

Keywords:

Austenitic Stainless Steels, Corrosion, Microstructure, TEM, Texture, Turning

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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* - Corresponding Author

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