Journal
MATERIALS CHARACTERIZATION
Volume 182, Issue -, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2021.111568
Keywords
Precipitation-strengthened steels; Molybdenum microalloying; Nucleation growth; Atom probe tomography; First-principles
Categories
Funding
- National Natural Science Foundation of China [U1860103]
- Fundamental Research Funds for the Central Universities [N2009008]
- State Key Laboratory of Powder Metallurgy, Central South University, Changsha, China
- Doctoral Scientific Research Foundation of Liaoning Province [2019-BS-254]
- Advanced Computing East China Sub-center
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The addition of Mo atoms can significantly increase the hardness effect of high-strength steels, while also slowing down the coarsening process of co-precipitates, demonstrating potential high thermostability.
The precipitation behavior of co-precipitates including Cu-rich precipitates (CRPs) and Ni(Al, Mn) particles and the hardness of the molybdenum microalloying high-strength steels were carefully investigated. It was found that individual additions of Mo atoms gave rise to an obvious hardness effect compared with the carbides precipitation steels. Although Mo atoms were primarily partitioned within the matrix rather than within the coprecipitates, the nucleation/growth process of co-precipitates was accelerated due to reducing the misfit strains between matrix and precipitates. Moreover, with increasing Mo microalloying, the coarsening of coprecipitates was retarded owing to the reducing coarsening coefficients of co-precipitates. The hardness peak time was shortened and the hardness plateau were prolonged by the precipitation of co-precipitates, showing potential high thermostability of Mo microalloying steels.
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