Microstructure Quantification in Nickel-Based Superalloy Udimet 720Li

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  • Yamaguchi Yoshiya
    Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology
  • Hisazawa Hiromu
    Graduate School of Technology, Industrial and Social Sciences, Tokushima University
  • Terada Yoshihiro
    Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology

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Abstract

<p>The morphology of γ′ precipitates for the wrought Ni-based superalloy Udimet 720Li was quantitatively evaluated by applying the absolute moment invariant technique. The diameter of the secondary γ′ precipitates, d, increased continuously with the decrease of the cooling rate, v, after solution treatment at 1473 K for 1 h along the following equation; d ∝ v−0.4. In addition, with decreasing cooling rate, the shape of the secondary γ′ precipitates changed from spherical to octodendritic. For the oil-quenched alloy after solution treatment, d continuously increased with the increase of the aging time at 1173 K, and the spherical shape remained unchanged during the process. On the contrary, for the furnace-cooled alloy, the shape evolved from octodendritic to spherical with the aging time, exhibiting an almost constant d.</p><p> </p><p>This Paper was Originally Published in Japanese in J. Japan Inst. Met. Mater. 82 (2018) 375–383.</p>

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 60 (4), 593-601, 2019-04-01

    The Japan Institute of Metals and Materials

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