PSI - Issue 65

M.A. Skotnikova et al. / Procedia Structural Integrity 65 (2024) 248–254 6 M.A. Skotnikova, A.Y. Ryabikin, A.D. Shestakov, L.D. Tuptei, A.D. Novokshenov / Structural Integrity Procedia 00 (2024) 000–000

253

The analysis of spectrograms in 09G2S and Hardox 450 steels confirmed the absence of any pronounced stable amplitude changes in the friction moment. Additional amplitude spikes of 0.85 and 0.70 magnitude were observed on the spectrogram for Quard 450 steel at frequencies of 0.0023 and 0.0034 Hz associated with the martensitic transformation mentioned above.

4. Conclusion

As a result of the research, an author's program was written in Python, used to compare the friction moments of two Hardox 450 and Quard 450 wear-resistant steels compared to conventional 09G2S steel. It is shown that, in comparison with Hardox 450 steel, structural-phase (martensitic) transformations occurred in the contact zone of the equidistant Quard 450 steel during friction, strengthening the surface in the contact zone and increasing its wear resistance. As shown by tribotechnical tests, the wear resistance increased in the direction of 1.0 → 7.9 → 18.1 in 09G2S → Hardox 450 → Quard 450 steels, respectively. Thus, in the Quard 450 steel, which has a minimum amplitude of the first harmonic, the second was split into 2 sinusoids with similar but different amplitudes. It can be assumed that structural and phase transformations took place in Quard 450 steel during the friction process, for example, residual austenite turned into deformation martensite, which strengthens the surface of the contact zone and increases the wear resistance of Quard 450 steel.

Acknowledgements

The research was carried out at the expense of a grant from the Russian Science Foundation, https://rscf.ru/en/project/22-19-00178/.

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