Microstructural analysis and mechanical behavior of the HAZ in an API 5L X70 steel welded by GMAW process
| Autor: | Temístocles de Sousa Luz, Nicolau Apoena Castro, Ariane Neves de Moura, Marcos Tadeu D’Azeredo Orlando, Estéfano Aparecido Vieira, Vinícius dos Santos Dagostini |
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| Rok vydání: | 2021 |
| Předmět: |
Austenite
0209 industrial biotechnology Materials science Bainite Mechanical Engineering Metallurgy Metals and Alloys Charpy impact test 02 engineering and technology Welding Acicular ferrite 020501 mining & metallurgy Gas metal arc welding law.invention 020901 industrial engineering & automation 0205 materials engineering Mechanics of Materials law Ferrite (iron) Martensite |
| Zdroj: | Welding in the World. 65:1051-1060 |
| ISSN: | 1878-6669 0043-2288 |
| DOI: | 10.1007/s40194-021-01102-6 |
| Popis: | This study aimed to investigate the heat-affected zone (HAZ) behavior in an API 5L X70 steel welded by the gas metal arc welding process (GMAW). In the steel welding processes, this region is very critical due to microstructural and allotropic transformations that affect the mechanical properties. Three samples were welded using a robotic arm with different welding speeds, thus obtaining three different heat inputs, which were 2.0 kJ/mm, 2.5 kJ/mm, and 3.0 kJ/mm. For all heat inputs, the microstructures of the HAZ showed the Widmanstatten ferrite, Acicular ferrite, bainite, and martensite and retained austenite, which influenced the mechanical properties of this region. The electron backscattering diffraction analysis showed that the presence of low-angle grain boundaries (2–15°) increases the fracture toughness. The kernel average misorientation map and the results of the Charpy impact test showed that the heat input of 3.0 kJ/mm lead to characteristics of the HAZ that are remarkably similar to the base metal (BM). |
| Databáze: | OpenAIRE |
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