Incoloy800合金的高温微动磨损特性

Fretting wear behavior of Incoloy800 alloy at high temperature

采用PLINT高温微动磨损试验机,研究核电用管材Incoloy800合金的高温微动磨损机制和动力学特性。Incoloy800合金圆管试件与0Cr18Ni9不锈钢配副件圆柱体在水平面上垂直交叉接触,控制法向载荷为80N、位移幅值为2～20μm、循环次数为3×104次,在不同温度(25℃、300℃和400℃)下进行微动磨损试验。结果表明:当载荷、温度一定时,随着位移幅值的增大,Incoloy800合金的微动运行经历从部分滑移区向混合区和滑移区规律性的转变。温度升高并未对微动运行的区域特性以及部分滑移区的稳态摩擦系数产生显著影响,但在混合区和滑移区,稳态摩擦系数随温度的升高而明显降低。Incoloy800合金的高温微动磨损机制主要表现为摩擦氧化、磨粒磨损与剥层的共同作用。

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.