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Metals and Materials International

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13-03-2024

Influence of Short-Term Aging Treatment on Precipitation Behavior of DD6 Single-Crystal Superalloy

Authors: Xiaopeng Li, Youshui Xie, Yao Huang, Yihan Zhao, Yanwen Sun, Chengzhi Zhao, Hexin Zhang

Published in: Metals and Materials International | Issue 8/2024

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Abstract

In this article, the precipitation behavior of primary γ’ (γ’_1st) precipitation and secondary γ’ (γ’_2nd) precipitation of DD6 during short-term thermal exposure is revealed by high-resolution transmission electron microscopy and scanning electron microscopy. After various times of elevated temperature aging treatment, the γ’_1st precipitates show varying degrees of decomposition; meanwhile, the fine secondary γ’ precipitates are heavily nucleated in the γ channel and show a regular morphological evolution process. In the process of elevated temperature aging treatment, sharp crevices start to appear at the edges of the γ’_1st precipitates, and present jagged and extensive decomposition behavior with time, and the γ’_1st precipitates exhibit directional decomposition behavior due to the annihilation of “positive” and “negative” edge dislocations at the γ / γ’ interface. The γ’_2nd precipitates progressively evolve in shape from spherical to cuboidal and then to butterfly-like shapes, and the size also increases with time. After creep at 980 ℃ / 250 MPa, the creep life of two specimens was examined: one being SHT + 1100 ℃ / 30min / AC, characterized by a secondary γ’ phase, and the other being SHT without this phase. The SHT + 1100 ℃ / 30 min / AC specimen exhibited a creep life of 240 h, whereas the SHT specimen lasted for 260 h. This disparity arose from a lower density of dislocation mesh in the SHT + 1100 ℃ / 30 min / AC specimen compared to the SHT specimen, consequently reducing its creep life. Nonetheless, both durations fell within the expected normal range of variation.

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Title: Influence of Short-Term Aging Treatment on Precipitation Behavior of DD6 Single-Crystal Superalloy
Authors: Xiaopeng Li
Youshui Xie
Yao Huang
Yihan Zhao
Yanwen Sun
Chengzhi Zhao
Hexin Zhang
Publication date: 13-03-2024
Publisher: The Korean Institute of Metals and Materials
Published in: Metals and Materials International / Issue 8/2024
Print ISSN: 1598-9623
Electronic ISSN: 2005-4149
DOI: https://doi.org/10.1007/s12540-024-01645-5

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