The effect of strain on interphase precipitation characteristics in a Ti-Mo steel
| Autor: | Ilana Timokhina, Hossein Beladi, Peter Hodgson, Jiangting Wang, Ilias Bikmukhametov |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Austenite Materials science Polymers and Plastics Precipitation (chemistry) technology industry and agriculture Metals and Alloys 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Isothermal process Electronic Optical and Magnetic Materials Ferrite (iron) 0103 physical sciences Ceramics and Composites Thermomechanical processing Interphase Deformation (engineering) Dislocation Composite material 0210 nano-technology |
| Zdroj: | Acta Materialia. 170:75-86 |
| ISSN: | 1359-6454 |
| DOI: | 10.1016/j.actamat.2019.03.022 |
| Popis: | In the current study, the effect of deformation in the non-recrystallization region on the characteristics of interphase precipitation was extensively studied in a Ti-Mo steel. The present observation revealed a novel mechanism affecting the interphase precipitation characteristics during an austenite-to-ferrite transformation, as a result of the thermomechanical processing. The hot deformation primarily led to the fragmentation of an austenite grain interior through the formation of elongated dislocation walls, locally deviating the orientation within a grain. Relatively coarse strain-induced precipitates were initially formed on the dislocation walls upon cooling. During the isothermal austenite to ferrite transformation, the interphase precipitation took place on the advancing austenite-ferrite interface front. This was similar to the strain-free condition, though the alignment of planar rows was abruptly altered while encountering the microband walls due to local orientation change at either side of a given microband. In addition, the deformation reduced the planar spacing of interphase precipitates up to a given strain (i.e., ∼0.3), beyond which it became nearly constant. This was due to the saturation of dislocation density within austenite above a certain strain and/or the consumption of alloying elements through the strain-induced precipitation formed on the microbands prior to the austenite to ferrite transformation. |
| Databáze: | OpenAIRE |
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