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New approach for assessing the weldability of precipitation-strengthened nickel-base superalloys

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Abstract

A new procedure was proposed for evaluating the weldability of nickel-base superalloys. The theory is on the basis of two microstructural patterns. In pattern I, the weld microstructure exhibits severe alloying segregation, many low-melting eutectic structures, and low weldability. The weld requires a weaker etchant and a shorter time for etching. In pattern II, the weld microstructure displays less alloying segregation, low quantity of eutectic structures, and high weldability. The weld needs a stronger etchant and a longer time for etching. Five superalloys containing different amounts of Nb and Ti were designed to verify the patterns. After welding operations, the welds were etched by four etchants with different corrosivities. The weldability was determined by TG-DSC measurements. The metallography and weldability results confirmed the theoretic patterns. Finally, the etchant corrosivity and etching time were proposed as new criteria to evaluate the weldability of nickel-base superalloys.

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Authors and Affiliations

  1. School of Metallurgy and Materials Engineering, Iran University of Science and Technology (IUST), 16846-13114, Tehran, Iran

    Homam Naffakh Moosavy, Mohammad-Reza Aboutalebi & Seyed Hossein Seyedein

  2. MAPNA Turbine Engineering and Manufacturing Company (TUGA), 15875-5643, Fardis, Karaj, Iran

    Meisam Khodabakhshi

  3. Dipartimento di Meccanica, Politecnico di Milano, Via La Massa 34, 20156, Milan, Italy

    Carlo Mapelli

Authors
  1. Homam Naffakh Moosavy
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  2. Mohammad-Reza Aboutalebi
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  3. Seyed Hossein Seyedein
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  4. Meisam Khodabakhshi
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  5. Carlo Mapelli
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Correspondence to Homam Naffakh Moosavy.

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Moosavy, H.N., Aboutalebi, MR., Seyedein, S.H. et al. New approach for assessing the weldability of precipitation-strengthened nickel-base superalloys. Int J Miner Metall Mater 20, 1183–1191 (2013). https://doi.org/10.1007/s12613-013-0853-x

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  • DOI: https://doi.org/10.1007/s12613-013-0853-x

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