Refining Crystal Grain of Inconel 718 by δ Process

  • Nishimaki Tomohiro
    Department of Mechanical Engineering, Graduate School of Science and Engineering, Tokyo Metropolitan University
  • Kakehi Koji
    Department of Mechanical Engineering, Graduate School of Science and Engineering, Tokyo Metropolitan University
  • Kawakami Yusuke
    Dowa Forging Co. Ltd.

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Other Title
  • δ プロセスによるインコネル718の結晶粒微細化
  • dプロセス ニ ヨル インコネル 718 ノ ケッショウリュウ ビサイカ
  • Refining Crystal Grain of Inconel 718 by δ Process

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Abstract

  The Ni-based superalloy Inconel 718 is used for aero-engine disks and is processed by forging and subsequent machine work. This study aimed to achieve uniformly fine crystal grain of Inconel 718 by the δ process, which prevents grain growth by applying a pinning force that intentionally precipitates any δ phase products. We observed the morphology of the δ phase, which changes according to the process of δ-phase precipitation heat treatment, and then prepared δ-processed Inconel 718 (DP718) by a small-size compression test that simulated the precision forging process. It was found that δ-processed specimens had finer and more uniform microstructures than the traditional processed Inconel 718.<br>

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