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Influence of thermo-mechanical treatment on the precipitation strengthening behavior of Inconel 740, a Ni-based superalloy

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Abstract

In this work, we have systematically explored the influence of thermo-mechanical treatment on the precipitation behavior and its strengthening in Inconel 740, a relatively new Ni-based superalloy, using specimens on which different levels of stresses were applied at 700 °C. With increasing applied stress, fraction of gamma prime precipitates increased (without significant size change) and nanoindentation hardness was enhanced. The stress effects were discussed in terms of the free energy barrier for heterogeneous nucleation and the prevailing mechanisms of precipitation strengthening.

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Acknowledgment

This work was supported by the Human Resources Development of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Knowledge Economy (No. 20101020300460).

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Authors and Affiliations

  1. Division of Materials Science and Engineering, Hanyang University, Seoul, 133-791, Korea

    Jun-Hak Oh, Byung-Gil Yoo, In-Chul Choi & Jae-il Jang

  2. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA

    Michael L. Santella

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  1. Jun-Hak Oh
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  2. Byung-Gil Yoo
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  3. In-Chul Choi
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  4. Michael L. Santella
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  5. Jae-il Jang
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Correspondence to Jae-il Jang.

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Oh, JH., Yoo, BG., Choi, IC. et al. Influence of thermo-mechanical treatment on the precipitation strengthening behavior of Inconel 740, a Ni-based superalloy. Journal of Materials Research 26, 1253–1259 (2011). https://doi.org/10.1557/jmr.2011.70

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