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Mechanical properties of Inconel 718 welds performed by gas tungsten arc welding

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Abstract

Gas tungsten arc welding (GTAW) was used to join plates of Inconel 718. The mechanical properties were determined by tensile, microhardness, and instrumented Charpy impact tests. An ERNiFeCr-2 filler metal fed by a semi-automatic mechanism was used. Partial dissolution of the strengthening phases, γ′ and γ″, induced a soft region (~ 225 HV1.0) in the heat-affected zone (HAZ) during welding. The yield strength (371.3 MPa) of the as-welded joint is approximately 45% of the base material in aged condition (822.7 MPa). The welds were subjected to a hardening recovery post weld heat treatment (HRPWHT). Impact testing of the hardened welds revealed a reduction of 17% in energy absorbed with respect the aged base material. Hardness measurements showed an increase to ~ 410 HV0.1 in the fusion zone; however, due to segregation of Nb and formation of carbides, the precipitation of γ″ is not fully completed, and the yield strength (719 MPa) of the heat-treated welded joint is lower than the base material in aged condition.

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Authors and Affiliations

  1. Instituto Politécnico Nacional CIITEC-IPN, Cerrada de Cecati S/N Col. Sta. Catarina, 02250, Azcapotzalco, CDMX, Mexico

    R. Cortés, E. R. Barragán, R. R. Ambriz & D. Jaramillo

  2. Instituto de Investigación en Metalurgia y Materiales, Universidad Michoacana de San Nicolás de Hidalgo, A.P. 888, 58000, Morelia, MICH, Mexico

    R. Cortés & V. H. López

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  1. R. Cortés
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  2. E. R. Barragán
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  3. V. H. López
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  4. R. R. Ambriz
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  5. D. Jaramillo
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Correspondence to R. R. Ambriz.

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Cortés, R., Barragán, E.R., López, V.H. et al. Mechanical properties of Inconel 718 welds performed by gas tungsten arc welding. Int J Adv Manuf Technol 94, 3949–3961 (2018). https://doi.org/10.1007/s00170-017-1128-x

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  • DOI: https://doi.org/10.1007/s00170-017-1128-x

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