Fretting wear behavior of Incoloy800 alloy at high temperature

The fretting wear behavior of nuclear power material Incoloy800 was investigated by PLINT high temperature fretting tester with the Incoloy800 cylinder against 0Cr18Ni9 cylinder at vertical cross contact under different temperatures(25,300 and 400℃).During testing,the normal load of 80 N was applied,the displacement amplitudes were from 2 μm to 20 μm,and the number of fretting cycles was 3×104.The fretting wear mechanism at high temperature and kinetic character of Incoloy800 steam generator tube materials were analyzed.The results show that the fretting course of Incoloy800 is transformed from partial slip regime into mixed fretting regime and gross slip regime by its fretting behavior with increasing displacement amplitude under the same normal load and temperature.Increasing temperature has no significant effect on fretting regime features and friction coefficients of partial slip regime,however,the friction coefficients decrease with the increase of temperature in mixed fretting regime and gross slip regime.The friction oxidation,abrasive wear and delamination are main fretting wear mechanisms of Incoloy800 at high temperature.