Structures appearing in roughened steel surfaces obtained by self-dewetting with electron beams
Heating and fast cooling of steel surfaces by means of a pulsed electron gun gives rise to peculiar structures characterized by a roughened surface due to spinodal self-dewetting and an intermediate region described as a heat-affected zone. In this work, numerical simulations of the heating of a ste...
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2005
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10735623_v36_n4_p999_Archiopoli http://hdl.handle.net/20.500.12110/paper_10735623_v36_n4_p999_Archiopoli |
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paper:paper_10735623_v36_n4_p999_Archiopoli2023-06-08T16:04:57Z Structures appearing in roughened steel surfaces obtained by self-dewetting with electron beams Boundary conditions Computer simulation Cooling Electron beams Electron guns Heating Mathematical models Phase transitions Scanning electron microscopy Surface roughness Thermal effects Wetting Micrograph Pulsed electron gun Self-dewetting Solid-solid transformation Steel surface Steel Heating and fast cooling of steel surfaces by means of a pulsed electron gun gives rise to peculiar structures characterized by a roughened surface due to spinodal self-dewetting and an intermediate region described as a heat-affected zone. In this work, numerical simulations of the heating of a steel surface by means of a pulsed electron gun are performed and contrasted with the experiments. The predictions of the depth of the melt pool and time elapsed above critical temperatures are used to interpret the experimental results. The combination of micrographs, cross sections, and numerical simulations allowed us to conclude that the instabilities giving rise to the dewetting structure are not related to vapor ejection. It is also concluded that the onset of the instability is a very fast process (on the order of at most a few microseconds), yielding a dewetting process that evolves in the entire melted pool, and that the spatial pattern scales with time elapsed above the melting temperature and the pool depth. The heat-affected zone (intermediate region) can now be understood to be where a solid-solid transformation occurs. 2005 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10735623_v36_n4_p999_Archiopoli http://hdl.handle.net/20.500.12110/paper_10735623_v36_n4_p999_Archiopoli |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Boundary conditions Computer simulation Cooling Electron beams Electron guns Heating Mathematical models Phase transitions Scanning electron microscopy Surface roughness Thermal effects Wetting Micrograph Pulsed electron gun Self-dewetting Solid-solid transformation Steel surface Steel |
| spellingShingle |
Boundary conditions Computer simulation Cooling Electron beams Electron guns Heating Mathematical models Phase transitions Scanning electron microscopy Surface roughness Thermal effects Wetting Micrograph Pulsed electron gun Self-dewetting Solid-solid transformation Steel surface Steel Structures appearing in roughened steel surfaces obtained by self-dewetting with electron beams |
| topic_facet |
Boundary conditions Computer simulation Cooling Electron beams Electron guns Heating Mathematical models Phase transitions Scanning electron microscopy Surface roughness Thermal effects Wetting Micrograph Pulsed electron gun Self-dewetting Solid-solid transformation Steel surface Steel |
| description |
Heating and fast cooling of steel surfaces by means of a pulsed electron gun gives rise to peculiar structures characterized by a roughened surface due to spinodal self-dewetting and an intermediate region described as a heat-affected zone. In this work, numerical simulations of the heating of a steel surface by means of a pulsed electron gun are performed and contrasted with the experiments. The predictions of the depth of the melt pool and time elapsed above critical temperatures are used to interpret the experimental results. The combination of micrographs, cross sections, and numerical simulations allowed us to conclude that the instabilities giving rise to the dewetting structure are not related to vapor ejection. It is also concluded that the onset of the instability is a very fast process (on the order of at most a few microseconds), yielding a dewetting process that evolves in the entire melted pool, and that the spatial pattern scales with time elapsed above the melting temperature and the pool depth. The heat-affected zone (intermediate region) can now be understood to be where a solid-solid transformation occurs. |
| title |
Structures appearing in roughened steel surfaces obtained by self-dewetting with electron beams |
| title_short |
Structures appearing in roughened steel surfaces obtained by self-dewetting with electron beams |
| title_full |
Structures appearing in roughened steel surfaces obtained by self-dewetting with electron beams |
| title_fullStr |
Structures appearing in roughened steel surfaces obtained by self-dewetting with electron beams |
| title_full_unstemmed |
Structures appearing in roughened steel surfaces obtained by self-dewetting with electron beams |
| title_sort |
structures appearing in roughened steel surfaces obtained by self-dewetting with electron beams |
| publishDate |
2005 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10735623_v36_n4_p999_Archiopoli http://hdl.handle.net/20.500.12110/paper_10735623_v36_n4_p999_Archiopoli |
| _version_ |
1768546597459722240 |