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Friction Freeform Fabrication of Superalloy Inconel 718: Prospects and Problems

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Abstract

Friction Freeform Fabrication is a new solid-state additive manufacturing process. The present investigation reports a detailed study on the prospects of this process for additive part fabrication in superalloy Inconel 718. Using a rotary friction welding machine and employing alloy 718 consumable rods in solution treated condition, cylindrical-shaped multi-layer friction deposits (10 mm diameter) were successfully produced. In the as-deposited condition, the deposits showed very fine grain size with no grain boundary δ phase. The deposits responded well to direct aging and showed satisfactory room-temperature tensile properties. However, their stress rupture performance was unsatisfactory because of their layered microstructure with very fine grain size and no grain boundary δ phase. The problem was overcome by heat treating the deposits first at 1353 K (1080 °C) (for increasing the grain size) and then at 1223 K (950 °C) (for precipitating the δ phase). Overall, the current study shows that Friction Freeform Fabrication is a very useful process for additive part fabrication in alloy 718.

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Authors and Affiliations

  1. Materials Joining Laboratory, Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai, 600036, India

    J. J. S. Dilip (Research Scholar) & G. D. Janaki Ram (Associate Professor)

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  1. J. J. S. Dilip
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  2. G. D. Janaki Ram
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Correspondence to G. D. Janaki Ram.

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Manuscript submitted May 27, 2013.

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Dilip, J.J.S., Janaki Ram, G.D. Friction Freeform Fabrication of Superalloy Inconel 718: Prospects and Problems. Metall Mater Trans B 45, 182–192 (2014). https://doi.org/10.1007/s11663-013-0003-x

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  • DOI: https://doi.org/10.1007/s11663-013-0003-x

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