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Kolli, R. Prakash |
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Kinetics of nanoscale Cu-rich precipitates in a multicomponent concentrated steel |
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Book Whole |
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2007 |
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320 |
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Kinetics; Cu; precipitate; steel |
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The kinetics of nanoscale Cu-rich precipitates of multicomponent concentrated steels has been investigated utilizing primarily APT and supplemented with a synchrotron radiation experiment, first-principles calculations, Thermo-Calc study, and CTEM (at the longest aging time). Results on mechanical properties and microstructure at a greater length scale are also presented. The studied steels, NUCu-170 and NUCu-140-x, are HSLC steels, and are primarily strengthened by nanoscale Cu-rich precipitates. NUCu-170 contains 1.82 at. % Cu, whereas NUCu-140-x contains nominally ca. 1.15 at. % Cu. This study focused on a 900 °C solutionizing treatment followed by isothermal aging at 500 °C between 0.25 and 1024 h for NUCu-170 and NUCu-140-1, and aging at 550 °C between 0.25 and 4 h for NUCu-140-3. In addition, a double aging treatment of 550 °C aging followed by 200 °C for 2 h was investigated for NUCu-140-3. |
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Ph.D. thesis |
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Northwestern University |
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NU @ m-krug @ |
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10472 |
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Isheim, Dieter; Kolli, R. Prakash; Fine, Morris E.; Seidman, David N. |
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An atom-probe tomographic study of the temporal evolution of the nanostructure of Fe-Cu based high-strength low-carbon steels |
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Journal Article |
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2006 |
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Scripta Materialia |
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Scripta Mater. |
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55 |
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35-40 |
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Precipitation strengthening; Interfacial segregation; Ferritic steels; Nanostructure; Temporal evolution; LEAP |
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A three-dimensional (3D) knowledge of the atomic-scale structure is necessary for improving the design and understanding of modern materials with complex microstructures, such as high-performance steels. Local-electrode atom-probe tomography is used to obtain atom-by-atom 3D reconstructions to characterize three versions of a copper, nickel, manganese, and aluminum bearing high-strength low-carbon steel, which achieve their high tensile yield strength, up to 1170 MPa (170 ksi), from the formation of nanometer-radius copper rich precipitates. The temporal evolution of these precipitates is followed at 500 |
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NU @ p-kolli @ |
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790 |
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