Strain ageing in welded joints of API5L X65Q seamless pipes
| Autor: | V. B. Trindade, Geraldo Lúcio de Faria, Rodolfo Lisboa Batalha, Rodrigo Rangel Porcaro, Luiz Cláudio Cândido, Leonardo Barbosa Godefroid |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Scanning electron microscope Mechanical Engineering Metallurgy technology industry and agriculture Metals and Alloys 02 engineering and technology Welding respiratory system 020501 mining & metallurgy Gas metal arc welding law.invention 0205 materials engineering Optical microscope Mechanics of Materials law Ultimate tensile strength Volume fraction Arc welding Composite material Tensile testing |
| Zdroj: | Welding International. 31:577-582 |
| ISSN: | 1754-2138 0950-7116 |
| DOI: | 10.1080/09507116.2016.1218613 |
| Popis: | In this work, we investigated the effects of the phenomenon of strain ageing in joints obtained by gas-shielded arc welding (gas metal arc welding, GMAW), of seamless pipes of API5L X65Q steel. Test specimens obtained from the welded joints were submitted to cold plastic strain of 3% and then aged for 1 h at 250 °C, so as to induce static ageing. For evaluating dynamic ageing, the test specimens were strained to 3% and loading was maintained for 1 h at 250 °C. The aged specimens were submitted to tensile testing and representative samples were examined in the light microscope and the scanning electron microscope. It was observed that the phenomenon altered the volume fraction of secondary constituents in the weld metal and in the HAZ, with increase in the proportion of ferrite–carbide aggregates. Regarding the mechanical properties, it was found that the phenomenon reduced the elastic ratio of the welded joints due to an increase in the ultimate strength, besides increasing the total elongation, b... |
| Databáze: | OpenAIRE |
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