期刊
MATERIALS LETTERS
卷 296, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.matlet.2021.129887
关键词
Metals and alloys; Microstructure; Continuous; Discontinuous precipitation; Wetting phase transition; Differential scanning calorimetry; Ni-Cr
资金
- National Natural Science Foundation of China [U1860103]
- Fundamental Research Funds for the Central Universities [N2009008]
The study found that in Ni-45%Cr alloys, discontinuous precipitation is favored at low temperatures and high Cr contents, while continuous precipitation is favored at high temperatures. The activation energies estimated showed that Nb and B suppress, but Zr promotes discontinuous precipitation. This research provides an effective method to understand the effect of additives on precipitation kinetics.
Microstructural dependence of continuous and discontinuous Cr-rich precipitation kinetics in Ni-45%Cr alloys on composition and thermal history was investigated by microstructure characterization and dif-ferential scanning calorimetry (DSC). The results indicated that discontinuous precipitation was favored at low temperatures and high Cr contents, while continuous precipitation was favored at high tempera-tures. Activation energies estimated by Kissinger equation using DSC and microstructural evolution showed that Nb and B suppressed, but Zr promoted discontinuous precipitation. It provided a simple effective method to figure out the effect of additions on precipitation kinetics. (c) 2021 Elsevier B.V. All rights reserved.
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