核用TP316H钢在不同介质环境下的微动磨损性能

采用自制的液态钠环境微动磨损试验机，研究了核用TP316H传热管在不同环境 (室温大气、室温水、450 ℃大气、450 ℃液态钠)下的微动磨损性能。试验采用管/柱正交接触方式，试验结束后，采用超景深显微镜、三维光学显微镜、SEM和EDS对磨痕形貌、摩擦化学反应及磨损量进行了表征，对比分析了4种介质环境对TP316H的微动磨损的影响，发现TP316H合金管在450 ℃液态钠中的磨损率最大，在室温水中的磨损率最小。4种介质环境下的磨损机理不同，室温大气环境中的磨损主要是剥层和氧化磨损，随着温度升高，氧化磨损加重；室温水环境中的磨损以磨粒磨损为主；高温液态钠环境中的磨损为磨损和腐蚀的耦合协同作用。

Fretting Wear Properties of Nuclear TP316H Steels under Different Medium Environments

Fretting wear tests of TP316H steels under different environments (air/water at room temperature, air/liquid sodium at 450 ℃) were carried out by a self-made fretting wear test rig with the contact configuration of tube-on-rod. After tests, the worn surfaces were examined by a super depth field microscope, 3D optical microscope, SEM(scanning electron microscope) and EDS(energy dispersive spectroscopy) to obtain information on wear morphology, volume and surface chemical compositions. The results show that the highest wear rate of TP316H steels in 450 ℃ liquid sodium and the lowest wear rate is in room temperature water. The wear mechanism of TP316H steels in 4 environments is different. Delamination and oxidative wear are the main wear mechanism in air, and oxidation intensifies with the increase of temperature, while the abrasive wear is dominant in water. The synergistic effect of wear and corrosion is found in liquid sodium at 450 ℃.