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The Mechanism of η Phase Precipitation in A286 Superalloy During Heat Treatment

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Abstract

In this research, the mechanism of eta (η-Ni3Ti) phase precipitation in iron-nickel-based A286 superalloy was assessed during aging heat treatment in the temperature range between 650 and 900 °C for the times of 1-30 h. Optical microscopy, scanning electron microscopy, differential thermal analysis, and x-ray diffractometry were used to describe the η phase transformation. The results showed that the major precipitates at temperatures below 840 °C were γ′ and η. The η phase started to precipitate at the expense of the γ′ phase after prolonged aging. The η phase existed in the samples aged at temperature higher than 760 °C with cellular morphology. The η volume fraction increased with increasing heat treatment time. In addition, when the aging temperature was increased from 760 to 820 °C, the η volume fraction increased and then decreased after 840 °C. The η phase morphology also changed from cellular to Widmanstätten-type during aging. The time-temperature-precipitation diagrams of these morphologies are presented. The results indicated the differences in precipitation mechanisms of η phase at 840 and 860 °C.

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Authors and Affiliations

  1. School of Metallurgy and Materials Engineering, Iran University of Science and Technology (IUST), Narmak, 16846-13114, Tehran, Iran

    M. Seifollahi, S. H. Razavi & Sh. Kheirandish

  2. Center of Excellence for High Strength Materials, Iran University of Science and Technology (IUST), Tehran, Iran

    Sh. Kheirandish

  3. Metallic Materials Research Center (MMRC-MA), Tehran, Iran

    S. M. Abbasi

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  1. M. Seifollahi
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  2. S. H. Razavi
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  4. S. M. Abbasi
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Correspondence to S. H. Razavi.

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Seifollahi, M., Razavi, S.H., Kheirandish, S. et al. The Mechanism of η Phase Precipitation in A286 Superalloy During Heat Treatment. J. of Materi Eng and Perform 22, 3063–3069 (2013). https://doi.org/10.1007/s11665-013-0592-1

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  • DOI: https://doi.org/10.1007/s11665-013-0592-1

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