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High-throughput nanoindentation mapping of cast IN718 nickel-based superalloys: influence of the Nb concentration

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  • Focus Issue: Advanced Nanomechanical Testing
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Abstract

A high-throughput correlative study of the local mechanical properties, chemical composition and crystallographic orientation has been carried out in selected areas of cast Inconel 718 specimens subjected to three different tempers. The specimens showed a strong Nb segregation at the scale of the dendrite arms, with local Nb contents that varied between 2 wt% in the core of the dendrite arms to 8 wt% in the interdendritic regions and 25 wt% within the second phase particles (MC carbides, Laves phases and δ phase needles). The nanohardness was found to correlate strongly with the local Nb content and the temper condition. On the contrary, the indentation elastic moduli was not influenced by the local chemical composition or temper condition, but directly correlated with the crystallographic grain orientation, due to the high elastic anisotropy of nickel alloys.

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Data availability

The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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Acknowledgments

The financial support of MAT4.0-CM project funded by Madrid region under programme S2018/NMT-4381 is gratefully acknowledged. CG acknowledges funding from the Spanish Ministry of Science, Innovation and Universities (BES-2017-080201). AOC acknowledges funding from the Madrid Region throught the “Talent Atraction Program” (2017-T2/IND-5156).We thank Dr. Manuel Avella for help with the TEM studies.

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Authors and Affiliations

  1. IMDEA Materials Institute, C/ Eric Kandel 2, 28906, Getafe, Madrid, Spain

    Alberto Orozco-Caballero, Cristina Gutierrez & Jon M. Molina-Aldareguia

  2. Department of Mechanical Engineering, Chemistry and Industrial Design, Escuela Técnica Superior de Ingeniería y Diseño Industrial - Polytechnic University of Madrid, Ronda de Valencia, 3, 28012, Madrid, Spain

    Alberto Orozco-Caballero

  3. Department of Materials Science and Engineering, Carlos III University, 28912, Leganes, Madrid, Spain

    Cristina Gutierrez

  4. Beijing Key Laboratory of Advanced High Temperature Materials, Central Iron and Steel Research Institute, Beijing, 100081, China

    Bin Gan

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  1. Alberto Orozco-Caballero
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  2. Cristina Gutierrez
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  4. Jon M. Molina-Aldareguia
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Correspondence to Jon M. Molina-Aldareguia.

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Orozco-Caballero, A., Gutierrez, C., Gan, B. et al. High-throughput nanoindentation mapping of cast IN718 nickel-based superalloys: influence of the Nb concentration. Journal of Materials Research 36, 2213–2222 (2021). https://doi.org/10.1557/s43578-021-00133-5

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