Abstract
The combined erosion-corrosion behavior of steels that are used in coal burning energy generation equipment was investigated over a period of several years using both laboratory nozzle tester and fluidized bed combustor in-service exposures at elevated temperatures. It was determined that the steels tested in both environments had the same types of metal wastage mechanisms. At shallow impingement angles and low particle velocities, scales formed on the steel surfaces that were segmented and were removed by a slow cracking and chipping mechanism. At steeper impingement angles and higher particle velocities, consolidated scales occurred that were removed by a higher rate, spalling mechanism. As the chromium content of the steel was increased, the scale became thinner but was still removed by the same mechanisms. Low chromium content steels containing additional silicon formed a highly segmented scale that protected the base metal, resulting in a low metal loss rate compared with those of much higher chromium content steels.
Published Version
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