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Effect of Double Aging Heat Treatment on the Short-Term Creep Behavior of the Inconel 718

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Abstract

This research studies the effect of double aging heat treatment on the short-term creep behavior of the superalloy Inconel 718. The superalloy, received in the solution treated state, was subjected to an aging treatment which comprises a solid solution at 1095 °C for 1 h, a first aging step of 955 °C for 1 h, then aged at 720 and 620 °C, 8 h each step. Creep tests at constant load mode, under temperatures of 650, 675, 700 °C and stress of 510, 625 and 700 MPa, were performed before and after heat treatment. The results indicate that after the double aging heat treatment creep resistance is increased, influenced by the presence of precipitates γ′ and γ″ and its interaction with the dislocations, by grain size growth (from 8.20 to 7.23 ASTM) and the increase of hardness by approximately 98%. Creep parameters of primary and secondary stages have been determined. There is a breakdown relationship between \(\dot{\upvarepsilon }_{\text{s}}\) and stress at 650 °C of Inconel 718 as received, around 600 MPa. By considering the internal stress values, effective stress exponent, effective activation energy, and TEM images of Inconel 718 double aged, it is suggested that the creep mechanism is controlled by the interaction of dislocations with precipitates. The fracture mechanism of Inconel 718 as received is transgranular (coalescence of dimples) and mixed (transgranular-intergranular), whereas the Inconel 718 double aged condition crept surfaces evidenced the intergranular fracture mechanism.

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Acknowledgments

The authors acknowledge all the financial support gave from CAPES and technical/scientifical advice from LME/LNNano/CNPEM Process Number 15053. Especial thanks to Tarcila Sugahara and Fabiano Emmanuel Montoro. This work is dedicated to the memory of Prof. Carlos de Moura Neto.

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Authors and Affiliations

  1. ITA – Instituto Tecnológico de Aeronáutica, São José dos Campos, SP, Brazil

    Felipe Rocha Caliari & Danieli Aparecida Pereira Reis

  2. EEL-USP – DEMAR, Universidade de São Paulo, Lorena, SP, Brazil

    Kátia Cristiane Gandolpho Candioto & Carlos Ângelo Nunes

  3. IPEN – Instituto Pesquisas Energéticas e Nucleares, São Paulo, SP, Brazil

    Antônio Augusto Couto

  4. UNIFESP – Universidade Federal de São Paulo, São José dos Campos, SP, Brazil

    Felipe Rocha Caliari & Danieli Aparecida Pereira Reis

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  1. Felipe Rocha Caliari
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  2. Kátia Cristiane Gandolpho Candioto
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  3. Antônio Augusto Couto
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  4. Carlos Ângelo Nunes
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  5. Danieli Aparecida Pereira Reis
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Correspondence to Felipe Rocha Caliari.

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Dedicated to the memory of Prof. Carlos de Moura Neto.

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Caliari, F.R., Candioto, K.C.G., Couto, A.A. et al. Effect of Double Aging Heat Treatment on the Short-Term Creep Behavior of the Inconel 718. J. of Materi Eng and Perform 25, 2307–2317 (2016). https://doi.org/10.1007/s11665-016-2051-2

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  • DOI: https://doi.org/10.1007/s11665-016-2051-2

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