Thermal stability of laser shock peening processed Ni-based superalloy DZ17G

Guangni Zhou, Hao Shen, Wenxin Zhu, Nobumichi Tamura, Kai Chen, Yubin Zhang*

*Corresponding author for this work

    Research output: Contribution to journalConference articleResearchpeer-review

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    Abstract

    Ni-based superalloys are widely used in challenging environments due to their exceptional mechanical properties. To enhance their resistance to damage, surface modification by laser shock pinning (LSP) is an approach to improve performance of superalloys. Considering that superalloys are typically used at high temperatures, the thermal stability of the LSP-processed material should be studied. In this article, the hardness and microstructure of a LSP-processed Ni superalloy, DZ17G, are characterized after annealing at various temperatures (up to 1000 °C) for different time periods. The results show that the majority of the strength increase achieved at the sample surface from LSP processing is lost after annealing at 800 °C for 10 h. Detailed microstructural characterization by synchrotron μXRD and metallography shows that the hardness decrease is due primarily to the annihilation of dislocations, and no recrystallization occurs in the temperature range studied.
    Original languageEnglish
    Article number012059
    JournalI O P Conference Series: Materials Science and Engineering
    Volume580
    Issue number1
    Number of pages6
    ISSN1757-8981
    DOIs
    Publication statusPublished - 2019
    Event40th Risø International Symposium on Material Science: Metal Microstructures in 2D, 3D, and 4D - Roskilde, Denmark
    Duration: 2 Sept 20196 Sept 2019

    Conference

    Conference40th Risø International Symposium on Material Science: Metal Microstructures in 2D, 3D, and 4D
    Country/TerritoryDenmark
    CityRoskilde
    Period02/09/201906/09/2019

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