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Studies on heat treatment and electrochemical behaviour of 3D printed DMLS processed nickel-based superalloy

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Abstract

Additive manufacturing and its process involved during manufacturing of engineering components are thriving areas in current researches. The usage of Direct Metal Laser Sintering (DMLS) process, can resolve the difficulties involved in the manufacturing of components used with turbine engines. The commercially available alloy Incone1718 is compatible with DMLS based Su-718 material. This investigation examines and experiments the effect of heat treatment process, using a combination of solutionizing at 1100 °C (2h) and aging at 845 °C for 24h, followed by air cooling. The metallurgical changes were observed with the help of optical imaging, to perceive the phase/structural transformation. Further, the heat treated samples were subjected to electrochemical polarization studies with 1.0 M H2SO4 as an electrolyte. The influence of alloying elements, before and after the heat treatment process of samples were analysed through scanning electron microscope and energy dispersive spectroscopy. The experimental results prove that, corrosion resistance was found to be much better while following the sequence of DMLS HT > Bare DMLS > Bare Commercial > Commercial HT alloy. However, the heat treated DMLS sample obtained during experimentation had lower current density and more positive corrosion potential than the commercial alloys.

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Authors and Affiliations

  1. Department of Mechanical Engineering and Centre for Surface Engineering, Kalasalingam Academy of Research and Education, Virudhunagar, Tamilnadu, India

    B. Anush Raj, J. T. Winowlin Jappes & M. Adam Khan

  2. Small Turbo Fan Section, Gas Turbine Research Establishment (GTRE), DRDO, Bangalore, India

    V. Dillibabu

  3. Department of Computer Science and Engineering and Centre for Surface Engineering, Kalasalingam Academy of Research and Education, Virudhunagar, Tamilnadu, India

    N. C. Brintha

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  1. B. Anush Raj
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  2. J. T. Winowlin Jappes
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  3. M. Adam Khan
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  5. N. C. Brintha
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Correspondence to M. Adam Khan.

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Raj, B.A., Jappes, J.T.W., Khan, M.A. et al. Studies on heat treatment and electrochemical behaviour of 3D printed DMLS processed nickel-based superalloy. Appl. Phys. A 125, 722 (2019). https://doi.org/10.1007/s00339-019-3019-5

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  • DOI: https://doi.org/10.1007/s00339-019-3019-5

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