Erosion-Corrosion Attack of Metals at High Temperatures

这项研究将对颗粒冲刷-腐蚀过程的理解扩展到镍、钴和铁的金属合金系统。实验中采用了各种不同的冲蚀条件，包括颗粒载荷、速度、入射角和温度。分析了试件表面的变形和放热机理。特别值得注意的是，合金表面附近可能会形成浓度梯度、内部氧化和广泛的瞬时氧化，所有这些都可能导致合金无法形成保护性的氧化层。在包括燃气轮机和煤气化炉在内的各种工业过程中，%的冲刷腐蚀过程会导致材料的严重退化。这项研究应该有助于抗这种类型退化的合金的设计。

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.