The paper presents an analysis of the stress state in the tensile test sample. The test sample has a hardened surface layer with chamic heat treatment – cementation. The analysis was carried out for various thicknesses of the reinforced cemented layer. If the whole thickness of the material is not cemented, the fracture is near the grip section of the specimen. The analysis results explain the cause of this fracture.

This work was supported by project APVV-14-0096. In addition, this publication is the result of the project implementation: Development of two types of freight wagons with bogies for non-standard wheelbase or track wheelset, complying with the criteria for interoperability, environmental issues, safety and reliability ITMS: 26220220070 supported by the Operational Programme Research and development funded by the ERDF.

Acknowledgements: This work was supported by the Slovak Research and Development Agency under the contract No. APVV-14-0096.