| タイトル | Microstructural variations induced by gravity level during directional solidification of near-eutectic iron-carbon type alloys |
| 著者（英） | Fiske, Michael R.; Curreri, Peter A.; Stefanescu, Doru M. |
| 著者所属（英） | NASA Marshall Space Flight Center|Alabama Univ. |
| 発行日 | 1986-07-01 |
| 言語 | eng |
| 内容記述 | The effects of gravity on the microstructure of directionally solidified near-eutectic cast irons are studied, using a Bridgman-type automatic directional solidification furnace aboard a NASA KC-135 aircraft which flies parabolic arcs and generates alternating periods of low-g (0.01 to 0.001 g, 30 seconds long) and high-g (1.8 g, 1.5 minutes long). Results show a refinement of the interlamellar spacing of the eutectic during low-g processing of metastable Fe-C eutectic alloys. Low-g processing of stable Fe-C-Si eutectic alloys (lamellar or spheroidal graphic) results in a coarsening of the eutectic grain structure. Secondary dendrite arm spacing of austenite increases in low-g and decreases in high-g. The effectiveness of low-gravity in the removal of buoyancy-driven graphite phase segregation is demonstrated. |
| NASA分類 | MATERIALS PROCESSING |
| レポートNO | 87A23845 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/379929 |
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