科研之友
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摘要
In this study, damping and mode shapes were investigated after boriding and austempering the spheroidal graphite cast iron (SGCI). The samples were boronised and austempered at 900 degrees Cfor 2 hours by employing the pack cementation method. The samples were cooled and tempered in a salt bath at 250 degrees Cand 375 degrees Cfor 1 hour. Once the boriding and austempering processes were completed, the samples were cooled at room temperature and washed with plenty of water. The modal frequencies, damping ratios and mode shapes of these samples exposed to different heat treatments were acquired by using the experimental modal analysis (MA) method. The same characteristic features were acquired with the finite element method (FEM), and the results were compared. It was found that after the heat treatment the sample austempered at 250 degrees C had a harder surface and a higher frequency than other samples.
- 出版日期2017
