Effect of casting temperature on the microstructure of as-cast GH625 alloy
| Autor: | WANG Hao-yu, DONG Jian-xin, ZHANG Mai-cang, ZHENG Lei, YAO Zhi-hao, ZHANG Qing-quan |
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| Jazyk: | čínština |
| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | 工程科学学报, Vol 37, Iss 11, Pp 1469-1476 (2015) |
| Druh dokumentu: | article |
| ISSN: | 2095-9389 05095174 |
| DOI: | 10.13374/j.issn2095-9389.2015.11.012 |
| Popis: | The microstructure of as-cast GH625 alloy was investigated on the basis of experimental methods such as Thermo-Calc software,scanning electron microscopy and energy dispersive spectroscopy. The effect of casting temperature on the microstructure was also analyzed by comparing different samples. The microstructure of as-cast GH625 alloy is a dendritic structure and M6C carbides accompanied with δ phase precipitate in the interdendritic area. Both primary dendrite arm spacing(λ1) and second dendrite arm spacing(λ2) increase with the increase of casting temperature; however,the microsegregation is affected by both diffusion distance and diffusion time. The comprehensive interaction of these two factors leads to the greatest microsegregation degree of Nb at 1420℃,which contributes to δ phase precipitation in the interdendritic area. As a result,diffusion distance and diffusion time should be comprehensively considered in making the casting process,so as to choose a proper casting temperature(or cooling rate). |
| Databáze: | Directory of Open Access Journals |
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