Manufacturing Technology 2023, 23(6):900-908 | DOI: 10.21062/mft.2023.092

Hydrogen Embrittlement of 11SMn30 Free-cutting Steel

Lukáš Šikyňa ORCID..., František Nový ORCID..., Peter Palček ORCID..., Petra Drímalová ORCID..., Martin Slezák ORCID..., Milan Uhríčik ORCID..., Veronika Chvalníková ORCID...
Faculty of Mechanical Engineering, Department of Materials Engineering, University of Žilina, Univerzitná 8215/1, 010 26 Žilina, Slovakia

The main objective of the work was to describe the laboratory methods suitable for hydrogenation of free-cutting steels and to study the hydrogen embrittlement of 11SMn30 free-cutting steel. Hydrogenation and subsequent mechanical testing of hydrogenated steel is not common laboratory method as it requires precise and expensive equipment, is time consuming and dangerous as hydrogen is highly reactive and explosive. Currently, there are several theories of hydrogen embrittlement mechanisms of steels that describe the causes of material degradation by hydrogen. However, those theories are not universally valid; individual accounts have been developed and describe hydrogen embrittlement only for specific conditions and may fail in their descriptions under others. In this work, the hydrogenation of free-cutting steel 11SMn30 steel by two different methods (immersion and ca-thodic) was investigated in order to induce embrittlement and to compare in particular the fracture surfaces after the Charpy impact test. The results reported in this paper indicate that manganese sulphide inclusions are not the main cause for hydrogen embrittlement in free-cutting steels. The effect of manganese sulphide inclusions was attributed only to hydrogen trapping, that generated a high stress causing their decohesion from the matrix.

Keywords: Hydrogen embrittlement, Free-cutting steel, Fracture, Mechanical testing
Grants and funding:

The research was funded by the Slovak Research and Development Agency under contract No. APVV-20-0427 and the Slovak Ministry of Education, Science, Research, and Sport's Scientific Grant Agency under contract VEGA No. 1/0741/21
This research was supported by HYDAC Electronics s.r.o., which supplied the specimens

Received: August 1, 2023; Revised: November 9, 2023; Accepted: November 13, 2023; Prepublished online: November 27, 2023; Published: December 22, 2023  Show citation

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Šikyňa L, Nový F, Palček P, Drímalová P, Slezák M, Uhríčik M, Chvalníková V. Hydrogen Embrittlement of 11SMn30 Free-cutting Steel. Manufacturing Technology. 2023;23(6):900-908. doi: 10.21062/mft.2023.092.
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