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Some consequences of thermosolutal convection: the grain structure of castings
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Lu, S. Z. Steube, R. S. Hellawell, A. Hansen, G. |
| Copyright Year | 1996 |
| Description | The essential principles of thermosolutal convection are outlined, and how convection provides a transport mechanism between the mushy region of a casting and the open bulk liquid is illustrated. The convective flow patterns which develop assist in heat exchange and macroscopic solute segregation during solidification; they also provide a mechanism for the transport of dendritic fragments from the mushy region into the bulk liquid. Surviving fragments become nuclei for equiaxed grains and so lead to blocking of the parental columnar, dendritic growth front from which they originated. The physical steps in such a sequence are considered and some experimental data are provided to support the argument. |
| File Size | 1437696 |
| Page Count | 14 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19970026972 |
| Archival Resource Key | ark:/13960/t71w0fm2d |
| Language | English |
| Publisher Date | 1996-03-01 |
| Access Restriction | Open |
| Subject Keyword | Metallic Materials Crystal Growth Grain Boundaries Directional Solidification Crystals Transport Properties Dendritic Crystals Convective Flow Fragments Solutes Castings Convection Heat Transfer Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
