Surface alloy depletion and martensite formation during glass to metal joining of austenitic stainless steels
| Autor: | Charles V. Robino, Donald Francis Susan, Joseph R. Michael, Mark A. Rodriguez, Matthew Joseph. Perricone, Gerald Albert Knorovsky |
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| Rok vydání: | 2012 |
| Předmět: |
Austenite
Materials science Alloy Metallurgy Oxide engineering.material Condensed Matter Physics Metal chemistry.chemical_compound chemistry visual_art Ferrite (iron) Martensite Diffusionless transformation visual_art.visual_art_medium engineering General Materials Science Electron backscatter diffraction |
| Zdroj: | Science and Technology of Welding and Joining. 17:321-332 |
| ISSN: | 1743-2936 1362-1718 |
| DOI: | 10.1179/1362171812y.0000000011 |
| Popis: | Preoxidised and glass to metal (GtM) sealed austenitic stainless steels displayed a ferritic (bcc) layer near the metal/oxide interface, as determined by electron backscatter diffraction and X-ray diffraction. Through electron probe microanalysis, it was determined that this layer was depleted of alloying elements due to the oxidation and sealing processes. Characterisation of the layer morphology suggested that it formed through the martensite transformation mechanism. Thermochemical modelling with ThermoCalc also supported a martensitic transformation as opposed to diffusional ferrite formation. The composition gradient through the layer was correlated to the Eichelman and Hull empirical relationship for martensite start (Ms) temperatures. Because of Cr, Mn and Si depletion during preoxidation and glass sealing, Ms temperatures near ambient are possible in this surface region. The martensite layer was non-uniform, however, with laths extending deeper into the alloy due to stabilised growth in th... |
| Databáze: | OpenAIRE |
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