Erosion-Corrosion Attack of Metals at High Temperatures

这项研究扩展了对颗粒侵蚀-腐蚀过程的理解，以镍、钴和铁为基础的金属合金系统。在受控的气体环境中，实验采用了颗粒载荷、速度、入射角和温度等多种侵蚀条件。分析了试样表面的变形和热演化机理。特别令人感兴趣的是合金表面附近可能出现的浓度梯度、内部氧化和广泛的瞬态氧化，所有这些都可能导致合金无法形成保护氧化层。在包括燃气轮机和煤气炉在内的广泛工业过程中，侵蚀-腐蚀过程会导致严重的材料降解。这项研究将有助于设计出能够抵抗这种退化的合金。

This research extends understanding of particle erosion-corrosion processes to metal alloy systems based on nickel, cobalt and iron. A wide variety of erosive conditions of particle loading, velocity, angle of incidence, and temperature are employed in the experiments in controlled gaseous environments. Mechanisms of deformation and heat evolution at the specimen surface are analyzed. Of particular interest is the possible development of concentration gradients near the alloy surface, internal oxidation, and extensive transient oxidation, all of which can contribute strongly to the failure of the alloys to form protective oxide layers. %%% Erosion-corrosion processes are responsible for serious material degradation in a wide range of industrial processes, including gas turbines and coal gasifiers. This research should aid in the design of alloys that resist this type of degradation.