Effects of Stress on the Hot-dipped Aluminide coating on Mild Steel at High-temperature
| Autor: | Chih-chien Man, 滿志謙 |
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| Rok vydání: | 2010 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 98 In this study, mild steel was coated by hot-dipping into a molten aluminum bath. The effect of stress on the microstructure of the aluminide layer was investigated by applying free stress、stress and after 48 hr free stress than applied stress on the aluminide layer during diffusion at 750 °C in static air. The results showed that the number of the void in the aluminide layer suffered stress is larger than in aluminide layer without applying stress. It also can be found that the thickness of the aluminide layer suffered stress is less than the thickness of the aluminide layer without stress. This phenomenon can be attributed to the deformation of the aluminide layer caused by the applied stress accelerated the formation of the void. From the observation of the morphology of crack in the aluminide layer, it revealed that the crack in the aluminide layer suffered low stress initial began at the void, which formed by the diffusion. While the aluminide layer suffered high stress, the crack was easily to form at the initial crack in the aluminide layer and the tongue-like Fe-Al intermetallic layer. In the experiment of aluminide layer after 48 hr free stress than applied on the aluminide layer, the crack mostly located at the void formed by the diffusion, and also the crack penetrated until it reached FeAl2 phase. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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