高温大气和氮气中Inconel690/1Cr13不锈钢的微动磨损特性

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The fretting wear behavior of the steam generator tubes material Inconel690 of nuclear power was investigated against 1Cr13 stainless steel by PLINT high temperature fretting tester in the slip regime under the conditions of the temperatures of 20？25 ℃（air）, 300 ℃（air） and 300 ℃（N 2 ）, the normal loads of 50 and 100 N, and the displacement amplitudes from 60 μm to 200 μm. The results show that the fretting friction coefficient gradually increases as the increase of displacement amplitude under the same normal load in the high-temperature air, however, the friction coefficient decreases in the high-temperature nitrogen. The damage degree of Inconel690 is slight in the high-temperature air, but more serious in the high-temperature nitrogen at the same load and displacement. In the high-temperature air and nitrogen atmosphere, the wear surface occurs different degrees of friction oxidation which generates mainly oxidation of Fe, Ni, Cr and so on. The abrasive wear, friction oxidation and delamination are main wear mechanisms of Inconel690.在试验温度为20~25℃（air）、300℃（air）、300℃（N2），法向载荷为（Fn）50和100N，位移幅值为60~200μm的条件下，采用PLINT高温微动磨损试验机研究核电蒸汽发生器传热管材Inconel690与1Cr13不锈钢圆柱配对副在滑移区的微动磨损特性。结果表明：当法向载荷一定时，随位移幅值增加，在高温大气中，微动摩擦因数逐渐升高；而高温氮气中，摩擦因数降低。当载荷和位移相同时，Inconel690在高温大气中磨损较轻，在高温氮气中损伤较严重。在高温大气和高温氮气中磨痕表面均出现不同程度摩擦氧化，主要生成Fe、Ni、Cr等合金元素的氧化物。Inconel690的磨损机制主要表现为磨粒磨损、摩擦氧化和剥层磨损的共同作用。