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2020•The Proceedings of Mechanical Engineering Congress JapanOpen access

Improvement in Creep Properties of Ni Based Superalloy Fabricated by Selective Laser Melting by Yttrium Addition

Taigi Nagoya, Santhosh Banoth, Koji Kakehi, Shigenari Hayashi, Yen-Ling Kuo

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Abstract

The effects of yttrium (Y) addition on the creep properties of a Ni-based superalloy fabricated by selective laser melting (SLM) were examines at 650°C. The creep rupture life and ductility of a superalloy produced by SLM were improved by addition of Y. In the Y-free superalloy, Al-rich oxide particles were observed around the δ-phase which is detrimental to creep life and ductility. The adding of Y to SLM superalloy formed Y oxide (yttrria) instead of Al-rich oxide, and it brought about the suppression of δ-phase precipitate growth and improved creep properties.

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The effects of yttrium (Y) addition on the creep properties of a Ni-based superalloy fabricated by selective laser melting (SLM) were examines at 650°C. The creep rupture life and ductility of a superalloy produced by SLM were improved by addition of Y. In the Y-free superalloy, Al-rich oxide particles were observed around the δ-phase which is detrimental to creep life and ductility. The adding of Y to SLM superalloy formed Y oxide (yttrria) instead of Al-rich oxide, and it brought about the suppression of δ-phase precipitate growth and improved creep properties.

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Available abstract

The effects of yttrium (Y) addition on the creep properties of a Ni-based superalloy fabricated by selective laser melting (SLM) were examines at 650°C. The creep rupture life and ductility of a superalloy produced by SLM were improved by addition of Y. In the Y-free superalloy, Al-rich oxide particles were observed around the δ-phase which is detrimental to creep life and ductility. The adding of Y to SLM superalloy formed Y oxide (yttrria) instead of Al-rich oxide, and it brought about the suppression of δ-phase precipitate growth and improved creep properties.

Key concepts: Superalloy, Creep, Materials science, Yttrium, Selective laser melting, Ductility (Earth science), Metallurgy, Oxide

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