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Hot compression behavior and microstructure of selectively laser-melted IN718 alloy

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Abstract

The integration of additive manufacturing into traditional manufacturing processes presents the future of engineered components with similar or superior performance levels to wrought or cast materials. In this work, the hot-deformation behavior and the microstructural changes of heat-treated SLM-printed IN718 specimens are investigated. Samples having the same shape and size were 3D-printed, homogenized (1100 °C, 1 h, and furnace-cooled), and hot-compressed, using a Gleeble® 3800 physical simulator at 1000 and 1050 °C and 0.1 and 0.01 s−1 strain rates. A 3D diagram showing the effect of temperature and strain rate on the flow stress behavior of IN718 during hot deformation is plotted. The dynamic recrystallization (DRX) mechanism was dominant in all specimens tested at 0.1 s−1, while dynamic recovery (DRV) dominated in 0.01 s−1 tests. Changing the strain rate from 0.01 to 0.1 s−1 at 1000 °C increased the peak stress from 150 to 290 MPa (93%), while with a temperature decrease from 1050 to 1000 °C at 0.1 s−1, the peak stress increased by 45%. Thus, the mechanical behavior was found to be more dependent on the strain rate than on the temperature. The DRX structure showed new grains developing at the boundaries of the original grains, whereas with the DRV structure, new grains grew within the original grains. A phenomenological model based on the Zener-Hollomon parameter was proposed in order to predict the size of recrystallized grains during hot deformation of the SLM-printed IN718 superalloy. The thermal softening due to recrystallization was compensated by precipitation hardening, as was revealed by phase analysis.

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Acknowledgments

Ahmad Mostafa, Ignacio Picazo Rubio, and Mamoun Medraj acknowledge the financial support received from the Masdar Institute of Science and Technology to perform this research.

Funding

École de technologie supérieure (ÉTS) is acknowledged for providing financial and equipment support in the framework of the Research Chair on Additive Manufacturing (Vladimir Brailovski) and Industrial Research Chair in Forming of High Strength Alloys, CM2P (Davood Shahriari and Mohammad Jahazi), and the National Science and Engineering Research Council (NSERC) in the frame work of Discovery Grant to carry out this research.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Tafila Technical University, Tafila, 66110, Jordan

    Ahmad Mostafa

  2. Department of Mechanical Engineering, École de technologie supérieure, 1100 Notre-Dame Street West, Montreal, Quebec, H3C 1K3, Canada

    Davood Shahriari, Vladimir Brailovski & Mohammad Jahazi

  3. Department of Mechanical and Materials Engineering, Masdar Institute of Science and Technology, Masdar City, Abu Dhabi, P.O. Box 54224, UAE

    Ignacio Picazo Rubio

  4. Mechanical Engineering Department, Concordia University, 15151 rue Sainte Catherine Ouest, Montreal, QC, H3G 2W1, Canada

    Mamoun Medraj

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  1. Ahmad Mostafa
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  2. Davood Shahriari
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  4. Vladimir Brailovski
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Correspondence to Mamoun Medraj.

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Mostafa, A., Shahriari, D., Rubio, I.P. et al. Hot compression behavior and microstructure of selectively laser-melted IN718 alloy. Int J Adv Manuf Technol 96, 371–385 (2018). https://doi.org/10.1007/s00170-017-1522-4

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  • DOI: https://doi.org/10.1007/s00170-017-1522-4

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