期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2015.01.023
关键词
NiAlMnCu-containing steel; Precipitation hardening; Cu-enriched phase; NiAl-enriched phase; APT
类别
资金
- Joint Funds of the National Natural Science Foundation of China [U1460103]
- State Key Lab of Advanced Metals and Materials [2014-Z08]
A NiAlMnCu-containing steel during ageing at 500 degrees C up to 100 h exhibits an interesting age-hardening effect. Careful atom probe tomography investigations confirm that small clusters, enriched with Ni, Al, Mn and Cu, formed in the steel after a short ageing of 0.25 h. Composite precipitates, consisting of a NiAl-rich and a Cu-rich component side by side, formed after 4 h ageing, a phenomenon which corresponded to a peak of 445 VHN in hardness. A decrease in hardness of the steel occurred after ageing for 100 h, due to the coarsening of the composite precipitates. Quantitative chemical composition measurements reveal that early-stage formation of composite precipitates involves the decomposition of metastable solute clusters, and their growth is associated with the further partitioning of solutes from the ferrite matrix into the composite precipitates. (C) 2015 Elsevier B.V. All rights reserved.
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