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- W3012414311 endingPage "108637" @default.
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- W3012414311 abstract "This study investigated the precipitation behavior of nanoscale Cu and Ni3Al particles in multi-component ultra-high strength steel (UHSS) and its influence on mechanical properties. The precipitation nanostructural features and matrix microstructural features of UHSS were carefully characterized by HRTEM, XRD and EBSD. Addition of Cu and Al in Fe-Ni steel increased the dislocation density of martensite and promoted the co-precipitation of Cu and Ni3Al nanoparticles upon aging. The Fe-Ni-Cu-Al steel achieved a yield strength of 1350 MPa at 525 °C aging for 2 h, of which ~950 MPa is contributed by dislocation strengthening and co-precipitation strengthening. The dislocation density in experimental steels was determined in the range of 1015 m−2, which gave rise to a strengthening contribution of over 400 MPa. Meanwhile, the extremely high dislocation density acted as preferred precipitation sites for the co-precipitation of nanoscale Cu and Ni3Al particles. The contribution of co-precipitation strengthening was calculated as 413 MPa, while the contribution of strengthening relying on solely Cu precipitation in Fe-Ni-Cu steel was only 144 MPa. As increasing the aging temperature, Ni3Al particles showed faster coarsening rate than that of Cu particles, which led to a significant decrease in the strengthening increment of Fe-Ni-Cu-Al steel." @default.
- W3012414311 created "2020-03-23" @default.
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- W3012414311 date "2020-06-01" @default.
- W3012414311 modified "2023-09-30" @default.
- W3012414311 title "Mechanical properties and nanoparticles precipitation behavior of multi-component ultra high strength steel" @default.
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- W3012414311 doi "https://doi.org/10.1016/j.matdes.2020.108637" @default.
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