Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 811, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.151916
Keywords
Ni-based alloy; Precipitation; Transmission electron microscopy; Atom probe tomography
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Funding
- U.S. Department of Energy (DOE) Integrated Research Project [DE-NE0000639]
- DOE Office of Nuclear Energy's Nuclear Energy University Program
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Alloy 625 is a commercial Ni-based superalloy commonly used in power generation applications. Its limited aging hardenability led to the design of Alloy 625 Plus through slight alloying modifications. However the differences in aging behavior between Alloy 625 and Alloy 625 Plus are not documented. Here, the precipitation behavior of Alloy 625 and Alloy 625 Plus after thermal aging at 650 degrees C up to 1000 h were quantitatively compared. Despite compositional similarities, Alloy 625 Plus exhibited both gamma '' and gamma' precipitation while the gamma '' phase formed in Alloy 625. Alloy 625 Plus exhibited higher number density and volume fraction and a slower coarsening rate of gamma '' precipitates. These precipitation differences may be associated with the larger Nb and Ti supersaturation and partition coefficients in Alloy 625 Plus as compared to Alloy 625. (C) 2019 Elsevier B.V. All rights reserved.
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