Evolution of Microstructure During Double-Sided Friction Stir Welding of Microalloyed Steel
| Autor: | B. Wei, T.N. Baker, Norman McPherson, K. He, Salaheddin Rahimi |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Equiaxed crystals
Materials science Bainite 0211 other engineering and technologies 02 engineering and technology Welding engineering.material TS 01 natural sciences law.invention chemistry.chemical_compound law 0103 physical sciences Friction stir welding 021102 mining & metallurgy 010302 applied physics Cementite Metallurgy technology industry and agriculture Metals and Alloys Recrystallization (metallurgy) Condensed Matter Physics chemistry Mechanics of Materials engineering Microalloyed steel Pearlite |
| Zdroj: | Metallurgical and Materials Transactions A. 50:2748-2764 |
| ISSN: | 1543-1940 1073-5623 |
| Popis: | Microstructures observed by analytical scanning and transmission electron microscopy in the overlap region of a double-sided friction-stir-welded microalloyed steel (EH46) were recorded in detail. They are compared with microstructures in the thermomechanically affected region of the weld and with the base material. The differences suggest that the overlap region has been stirred in the single-phase ferrite, and consists mainly of small equiaxed ferrite grains with strain-induced precipitates, while the thermomechanically affected zone was processed in the austenite-ferrite-phase field, resulting in a mixture of bainite lath packets and ferrite grains. The almost complete absence of pearlite or cementite in the overlap region has led to the suggestion that it dissolved during friction stir welding, providing carbon for strain-induced precipitation. Also, in the complex microstructures of the overlap region, ferrite grains containing a high density of cell-like structures were observed, some of them having precipitates nucleated on their intersections. This implies that strain-induced continuous dynamic recrystallization has occurred. |
| Databáze: | OpenAIRE |
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