SANS Study of Phase Decomposition in Fe-Cu Alloy with Ni and Mn Addition.

Osamura, Kōzō; Okuda, Hiroshi; Asano, Kimihiro; Furusaka, M.; Kishida, Kuniharu; Kurosawa, Fumio; Uemori, Ryuji

doi:10.2355/isijinternational.34.346

Cited by 90 publications

(36 citation statements)

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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: 82%

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

Vaynman

Isheim

Kolli³

et al. 2008

Metall Mater Trans A

109

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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: 82%

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

Vaynman

Isheim

Kolli³

et al. 2008

Metall Mater Trans A

109

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“…[1][2][3][4][5][6][7][8][9] In the previous study, 10) the spinodal decomposition of the (bcc) phase in an Fe-Cu-MnNi quaternary alloy, which is a base system of the light-water reactor pressure vessel, 11,12) was simulated by using the phase-field method, and it was pointed out that the segregation of Mn and Ni takes place at the surface of (bcc) Cu particles. However, the experimental investigation by Osamura et al 13) concluded that this segregation is not observed at the surface of the Cu particles but instead at the surface of (fcc) Cu particles. Isheim et al 14) have also recently confirmed the segregation of Mn and Ni at the surface of the Cu particles.…”

Section: Introductionmentioning

confidence: 90%

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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“…Using the features of SAS, the application to Fe-Cu alloys has been reported by Osamura et al using SANS 5,6) and Deschamps et al by SAXS. 7) Deschamps et al also reported detailed analysis of the microstructure evolution of Al alloys by time-resolved SAXS.…”

Section: Intermediate-angle Neutron Scattering Instrument For Quantitmentioning

confidence: 99%