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Microstructures, Forming Limit and Failure Analyses of Inconel 718 Sheets for Fabrication of Aerospace Components

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Abstract

Recently, aerospace industries have shown increasing interest in forming limits of Inconel 718 sheet metals, which can be utilised in designing tools and selection of process parameters for successful fabrication of components. In the present work, stress-strain response with failure strains was evaluated by uniaxial tensile tests in different orientations, and two-stage work-hardening behavior was observed. In spite of highly preferred texture, tensile properties showed minor variations in different orientations due to the random distribution of nanoprecipitates. The forming limit strains were evaluated by deforming specimens in seven different strain paths using limiting dome height (LDH) test facility. Mostly, the specimens failed without prior indication of localized necking. Thus, fracture forming limit diagram (FFLD) was evaluated, and bending correction was imposed due to the use of sub-size hemispherical punch. The failure strains of FFLD were converted into major-minor stress space (σ-FFLD) and effective plastic strain-stress triaxiality space (ηEPS-FFLD) as failure criteria to avoid the strain path dependence. Moreover, FE model was developed, and the LDH, strain distribution and failure location were predicted successfully using above-mentioned failure criteria with two stages of work hardening. Fractographs were correlated with the fracture behavior and formability of sheet metal.

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Acknowledgments

Authors wish to express their sincere gratitude to Indian Space Research Organisation (ISRO), Government of India, through Kalpana Chawla Space Technology Cell, IIT Kharagpur (Sanction Number-IIT/KCSTC/CHAIR./NEW.APPR./13-14/64), for providing the financial support.

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Authors and Affiliations

  1. Department of Mechanical Engineering, I.I.T. Kharagpur, Kharagpur, WB, 721302, India

    K. Sajun Prasad & Sushanta Kumar Panda

  2. Department of Metallurgical and Materials Engineering, I.I.T. Kharagpur, Kharagpur, WB, 721302, India

    Sujoy Kumar Kar & Mainak Sen

  3. VSSC, Indian Space Research Organisation, Thiruvananthapuram, Kerala, 695022, India

    S. V. S. Naryana Murty & Sharad Chandra Sharma

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  1. K. Sajun Prasad
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Correspondence to Sushanta Kumar Panda.

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Sajun Prasad, K., Panda, S.K., Kar, S.K. et al. Microstructures, Forming Limit and Failure Analyses of Inconel 718 Sheets for Fabrication of Aerospace Components. J. of Materi Eng and Perform 26, 1513–1530 (2017). https://doi.org/10.1007/s11665-017-2547-4

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