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概要

In order to study the wear properties of the pipe materials for the power generating plants, impact fretting wear tests of AISI304 disks against Al2O3 balls and AISI304 balls were carried out in high temperature pure water. SEM, EPMA, 3D-profilometer and nano-indenter were used for observation, analysis and measurement of wear scars. The maximum wear depth of the disk increased with an increase in water temperature and decreased with an increase in impact frequency below 80°C. However, the maximum wear depth decreased at 130°C due to a hard hydroxide layer that adhered to the wear scar of the AISI304 disk. We proposed the wear prediction model based on the impact fretting test showing the significant chemical effect in impact fretting wear. Therefore, we suggest the effect of chemical factors for the prediction of the pipe wall thinning phenomenon by liquid droplet impingement erosion.

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