Microstructural and Inclusion Characteristics of C–Mn Steel Welds at a Minimal Level of Titanium
| Autor: | Hee-Jin Kim, Glyn M. Evans, Changhee Lee, Kangmyung Seo, Ka Hee Kim, Hoisoo Ryoo |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
020502 materials Metallurgy Metals and Alloys Nucleation chemistry.chemical_element Critical limit 02 engineering and technology Welding Condensed Matter Physics Microstructure Acicular ferrite law.invention 0205 materials engineering Weld microstructure chemistry Mechanics of Materials law Ferrite (iron) Materials Chemistry Titanium |
| Zdroj: | Metals and Materials International. 26:1226-1234 |
| ISSN: | 2005-4149 1598-9623 |
| DOI: | 10.1007/s12540-019-00390-4 |
| Popis: | To better determine the lower limit of titanium content for the formation of acicular ferrite, C–Mn steel welds varying the titanium concentration at a minimal level from nearly zero to about 30 ppm have been investigated. Optical and SEM observations of as-deposited weld microstructures showed that when the titanium content increased from 1 to 9 ppm or higher, a dramatic change in weld microstructure from one dominant with ferrite with second phase to one with acicular ferrite takes place, being attributed to a concurrent increase in nucleation potency of inclusions for acicular ferrite plates. These results suggest that the critical limit of titanium required is about 9 ppm or even lower for the present weld system. In TEM, the inclusions of titanium-containing welds were found to be partly covered with a titanium-rich phase, indicating that this phase plays an important role in promoting the nucleation ability of inclusions and thus in developing a weld microstructure composed of a high proportion of acicular ferrite. |
| Databáze: | OpenAIRE |
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