Abstract
Gas tungsten arc welding (GTAW) was used to join Inconel 718 and AL6XN plates. The welding was made in aged condition for the Inconel 718 plates. Mechanical properties were determined by tensile, microhardness and instrumented Charpy impact tests. An ERNiFeCr-2 filler metal was fed by a semiautomatic mechanism. The results show that the mechanical properties of as-welded and hardening recovery provided by post weld heat treatment (HRPWHT) conditions are close. The HRPWHT provide a notorious improvement in mechanical properties in the fusion zone (FZ) as well as in the Inconel 718 side. However, it did not have any effect in the AL6XN side. Due to the aforementioned, the resistance of the weldment (IN718-AL6XN) is similar in both conditions. For the tension tests, the weldments to which heat treatment was not applied exhibit the failure in the weld bead, on the other side, the weldments with HRPWHT fractured along the fusion line at the AL6XN side. The failure in the weld bead was attributed to the presence of detrimental secondary phases (NbC and Laves), which were partially dissolved with the HRPWHT. This provides similar mechanical properties of the dissimilar welded joints. The most evident difference was observed in the elongation percentage, which was higher in the as-welded condition (14.05%) in comparison with the HRPWHT condition (10.8%).
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Acknowledgements
It is appreciated the financial support given for this project by the National Council of Science and Technology of the Mexican government. In addition, we are grateful with the technical and academic support given by the Instituto de Investigación en Metalurgia y Materiales of the UMSNH and the Centro de Investigación e Innovación Tecnológica of the IPN.
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Cortés, R., Ambriz, R.R., López, V.H., Barragán, E.R., Ruiz, A., Jaramillo, D. (2018). Mechanical Evaluation of IN718-AL6XN Dissimilar Weldment. In: Ambriz, R., Jaramillo, D., Plascencia, G., Nait Abdelaziz, M. (eds) Proceedings of the 17th International Conference on New Trends in Fatigue and Fracture. NT2F 2017. Springer, Cham. https://doi.org/10.1007/978-3-319-70365-7_25
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