An investigation of impact dominating fretting wear of Inconel 690TT tubes at different temperatures
In order to study the effect of impact micromotional wear of heat exchanger tubes in steam generators,the impact micromotional wear of Inconel 690TT tubes with SUS405 supports was experimentally studied at temperatures of 200,250,285℃,and the wear characteristics were systematically analyzed by means of scanning electron microscopy and energy spectrometry.The results show that the wear amounts at 250℃ and 285℃ are similar and significantly larger than the test results at 200℃.Through the analysis of the worn surface,it is found that an increase in temperature leads to a more significant delamination and a decrease in the surface hardness in turn leads to an increase in wear volume.From the results of the spectrometer analyses,the oxidation becomes severe at 250℃ and 285℃,but the mass transfer is not severe in terms of C and Fe content.However,the mass transfer increases slightly with increasing temperature.This indicates that the main wear mechanism of impact wear is delamination,and adhesive wear shows a rising trend with increasing temperature.The research results of the impact micromotion wear mechanism are of great significance for the subsequent research,design and maintenance of steam generators.
国家科技期刊平台
NSTL
万方数据
