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Thermomechanical response of additively manufactured Inconel 718 during hot torsion tests

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Abstract

In this study, we have investigated the microstructural changes during deformation of the SLM samples printed Inconel 718 using hot torsion tests. Prior to thermomechanical testing, the as-built samples are homogenized at 850 °C for 2 h in Ar atmosphere followed by air cooling. Hot torsion tests are performed at temperatures of 800, 1000 and 1100 °C, and at strain rates of 0.01, 0.1 and 1 s−1. It is observed that the dynamic recrystallization mechanism progresses with the evolution of annealing twins which is quantified by the increase in % of annealing twins during thermomechanical deformation. It is observed that samples deformed at 850 °C for strain rates of 0.01 and 0.1 s−1 shows brittle like fracture and no dynamic recrystallization. However, the samples deformed at 1000 and 1100 °C for strain rates of 0.01, 0.1 and 1 s−1 shows typical stress strain curves obtained for dynamic recrystallization. It is noted that the peak stress decreases with an increase in the temperature and increases with an increase in the strain rate. Alongside, an activation energy (Q) of 379.62 kJ/mol for SLMed Inconel 718 samples is calculated which agrees with the reported values in the literature for Hot compression tests.

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Funding

This work was conducted as part of the “ENABLE” project funded by the European Union's Marie Sklodowska-Curie Actions (MSCA) Innovative Training Networks (ITN) H2020-MSCA-ITN-2017 under the grant agreement Number 764979. P. Yadav has received support from the additive team at LORTEK, Spain for printing the Inconel 718 samples at their facility.

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Authors and Affiliations

  1. SIRRIS, Rue du Bois Saint-Jean 12, 4102, Seraing, Belgium

    Pinku Yadav & Olivier Rigo

  2. Université Bordeaux, I2M, UMR 5295, CNRS, F-33400, Talence, France

    Pinku Yadav, Corinne Arvieu & Eric Lacoste

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  1. Pinku Yadav
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  2. Olivier Rigo
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  3. Corinne Arvieu
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Pinku Yadav, Corinne Arvieu, Olivier Rigo and Eric Lacoste. The first draft of the manuscript was written by Pinku Yadav and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Eric Lacoste.

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The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, or in the decision to publish the results.

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Yadav, P., Rigo, O., Arvieu, C. et al. Thermomechanical response of additively manufactured Inconel 718 during hot torsion tests. Int J Adv Manuf Technol 128, 4339–4355 (2023). https://doi.org/10.1007/s00170-023-12018-4

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