高温純水中における SUS304 鋼の インパクトフレッティング摩耗に及ぼす化学的影響
Chemical Effect on Impact Fretting Wear of AISI304 Stainless Steel in High Temperature Pure Water
佐藤 善紀 Yoshiki SATO 岩渕 明 Akira IWABUCHI 内舘 道正 Michimasa UCHIDATE 八代 仁 Hitoshi YASHIRO
Corrosive wearImpact frettingLiquid droplet impingement erosionPipe wall thinningStainless steel
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.