Interfacial segregation at Cu-rich precipitates in a high-strength low-carbon steel studied on a sub-nanometer scale

Isheim, Dieter; Gagliano, Michael S.; Fine, M. E.; Seidman, David N.

doi:10.1016/j.actamat.2005.10.023

Cited by 278 publications

(118 citation statements)

References 39 publications

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“…The results of this study predict that bcc Cu precipitates with Cu-rich concentrations, in a binary Fe-Cu alloy, are mechanically unstable, which is consistent with APT observations showing significant quantities of Fe in Cu precipitates with about 2-nm radius. [20,27,28,30,58,59] Nickel and Mn spherical shell enrichment has been observed for model Fe-Cu-Ni and Fe-Cu-Ni-Mn steels, [30,58,59,[62][63][64] but the concomitant enrichment in Al is a new result. Approximately equal proportions of Ni and Al in the spherical shell surrounding the Cu-rich core at 100 hours of aging may possibly be related to formation of a B2 ordered intermetallic phase.…”

Section: Atom-probe Tomographymentioning

confidence: 81%

“…[21][22][23] Investigation, by atom-probe tomography (APT) [24][25][26] of the bcc Cu precipitates in a NUCu-100 steel specimen solutionized for 30 minutes at 1100°C and directly aged for 100 minutes at 490°C demonstrated the existence of chemically complex Cu-rich precipitates containing Fe, Ni, Mn, and Al. [27,28] The precipitate/a-Fe matrix heterophase interfaces are enriched in Ni and Mn forming a spherical shell-like structure, whereas the Al enhancement is found toward the inner region of the Cu precipitates.…”

Section: Approximately 20 Years Ago the United Statesmentioning

confidence: 99%

“…[30] Previous atom-probe studies of thermally aged Fe-Cubased alloys have consistently detected significant amounts of Fe in Cu-rich precipitates about 2 nm in radius, in both binary Fe-Cu alloys [20,58] and multicomponent Fe-Cu-based alloys. [27,28,30,59] Small-angle neutron scattering (SANS), [56,60] using indirect methods that involve magnetic scattering for deconvoluting the precipitate composition, however, suggests a much smaller amount of Fe of up to 10 at. pct in the precipitates.…”

Section: Atom-probe Tomographymentioning

confidence: 99%

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High-Strength Low-Carbon Ferritic Steel Containing Cu-Fe-Ni-Al-Mn Precipitates

Vaynman

Isheim

Kolli³

et al. 2008

Metall Mater Trans A

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108

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An investigation of a low-carbon, Fe-Cu-based steel, for Naval ship hull applications, with a yield strength of 965 MPa, Charpy V-notch absorbed impact-energy values as high as 74 J at -40°C, and an elongation-to-failure greater than 15 pct, is presented. The increase in strength is derived from a large number density (approximately 10 23 to 10 24 m -3 ) of copper-iron-nickelaluminum-manganese precipitates. The effect on the mechanical properties of varying the thermal treatment was studied. The nanostructure of the precipitates found within the steel was characterized by atom-probe tomography. Additionally, initial welding studies show that a brittle heat-affected zone is not formed adjacent to the welds.

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Section: Atom-probe Tomographymentioning

confidence: 81%

Section: Approximately 20 Years Ago the United Statesmentioning

confidence: 99%

Section: Atom-probe Tomographymentioning

confidence: 99%

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High-Strength Low-Carbon Ferritic Steel Containing Cu-Fe-Ni-Al-Mn Precipitates

Vaynman

Isheim

Kolli³

et al. 2008

Metall Mater Trans A

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108

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“…Isheim et al 14) have also recently confirmed the segregation of Mn and Ni at the surface of the Cu particles. On the other hand, according to the recent atom-probe tomography investigation by Isheim et al, 15) segregation takes place also for Cu particles. The objective of this study is to extend the previous simulation to calculate not only the diffusion-controlled phase decomposition but also the structural phase transformation from bcc to fcc in the same Fe-Cu-Mn-Ni quaternary alloy.…”

Section: Introductionmentioning

confidence: 99%

Phase-Field Simulation of Phase Transformation in Fe-Cu-Mn-Ni Quaternary Alloy

2006

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The phase decomposition in (bcc) phase and the subsequent structural phase transformation from to (fcc) phase during isothermal aging of an Fe-Cu-Mn-Ni quaternary alloy, which is a base alloy of the light-water reactor pressure vessel, have been simulated by the phasefield method. At the early stage of spinodal decomposition, Cu-rich phase is formed, and the Mn and Ni, which are minor components, are partitioned to the Cu-rich phase. As the Cu composition in the precipitate is increased, the Ni atoms inside the precipitates move to the interface region between the precipitate and matrix, but Mn atoms remain inside the Cu particles. When the Cu-rich particles eventually transform to the fcc structure, the Mn atoms also move to the interface region, which results in the shell structure of the fcc Cu precipitates, where each particle is surrounded by a thin layer enriched in Mn and Ni. This microstructural change can be reasonably explained by considering the local equilibrium at the surface region of the Cu-rich particles.

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“…Similar conclusions were drawn regarding the Ni and Mn segregation at the interface of Cu-rich particles in a low-carbon steel. [29] IV. CONCLUSIONS…”

Section: Resultsmentioning

confidence: 99%

Observation of Precipitation Evolution in Fe-Ni-Mn-Ti-Al Maraging Steel by Atom Probe Tomography

Pereloma

Stohr

Miller

et al. 2009

Metall Mater Trans A

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We describe the full decomposition sequence in an Fe-Ni-Mn-Ti-Al maraging steel during isothermal annealing at 550°C. Following significant pre-precipitation clustering reactions within the supersaturated martensitic solid solution, (Ni,Fe) 3 Ti and (Ni,Fe) 3 (Al,Mn) precipitates eventually form after isothermal aging for~60 seconds. The morphology of the (Ni,Fe) 3 Ti particles changes gradually during aging from predominantly plate-like to rod-like, and, importantly, Mn and Al were observed to segregate to these precipitate/matrix interfaces. The (Ni,Fe) 3 (Al,Mn) precipitates occurred at two main locations: uniformly within the matrix and at the periphery of the (Ni,Fe) 3 Ti particles. We relate this latter mode of precipitation to the Mn-Al segregation.

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Interfacial segregation at Cu-rich precipitates in a high-strength low-carbon steel studied on a sub-nanometer scale

Cited by 278 publications

References 39 publications

High-Strength Low-Carbon Ferritic Steel Containing Cu-Fe-Ni-Al-Mn Precipitates

High-Strength Low-Carbon Ferritic Steel Containing Cu-Fe-Ni-Al-Mn Precipitates

Phase-Field Simulation of Phase Transformation in Fe-Cu-Mn-Ni Quaternary Alloy

Observation of Precipitation Evolution in Fe-Ni-Mn-Ti-Al Maraging Steel by Atom Probe Tomography

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