Abstract
In previous investigations on wear mechanisms at high temperatures made in High Temperature-Single Impact Test (HT-SIT) and High Temperature-Continuous Impact Abrasion Test (HT-CIAT), predominant wear mechanisms were identified and correlations to different material parameters could be presumed. In order to confirm these correlations, four different alloys which are promising to be used in high temperature applications like a sinter grate have been studied in the High Temperature-Erosion Test (HT-ET) by the use of different impact angles and different impact energies. Especially the change of wear mechanism caused by increasing testing temperature was analysed in detail. Characterisation of microstructure and wear behaviour has been done by optical microscopy (OM) and scanning electron microscopy (SEM). Results obtained by the use of the different measurement techniques were linked and set into comparison to calculate the volumetric wear of the specimen. Predominant wear mechanisms were determined using OM in the mode of cross-section images and SEM. The results indicate that material parameters such as hardness and hard phase content can be correlated to the erosion wear rates at different impact angles. The test results indicate that at higher temperatures, the material fatigue becomes a major wear-determining factor. The test results also confirmed that there is a critical impact energy for each material above where the wear rate increases significantly. Test results with thermally aged materials also show that a better heat-resistant matrix reduces the material fatigue thus resulting in lower wear rates.
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Acknowledgements
This study was funded by the “Austrian Kplus-Program” and has been carried out within the “Austrian Center of Competence for Tribology”. The authors are also grateful to Böhler-Edelstahl for providing steels and performing heat-treatment procedures for different steel types, and Castolin Eutectic for help in the manufacturing of the welding samples. Katsich Christian is acknowledged for help in performing tests and wear quantification.
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Winkelmann, H., Varga, M., Badisch, E. et al. Wear Mechanisms at High Temperatures: Part 2: Temperature Effect on Wear Mechanisms in the Erosion Test. Tribol Lett 34, 167–175 (2009). https://doi.org/10.1007/s11249-009-9425-7
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DOI: https://doi.org/10.1007/s11249-009-9425-7