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

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Abstract

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 1023 to 1024 m−3) of copper-iron-nickel-aluminum-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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Notes

  1. The term NUCu stands for Northwestern University copper alloyed steel.

  2. In earlier publications and conference proceedings, we denoted the same heats as NUCu-150-x or AlNiCu-150-x. We make the change to NUCu-140-x to better relate the steel to similar Cu alloyed steels previously developed at Northwestern University.

  3. IVAS is a trademark of Imago Scientific Instruments, Madison, WI.

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Acknowledgments

This research is supported by the Office of Naval Research (Grant No. N00014-03-1-0252), Dr. Julie Christodoulou, grant officer. Atom-probe tomographic analyses were performed at the Northwestern University Center for Atom-Probe Tomography (NUCAPT), and the LEAP tomograph was purchased with funding from the NSF-MRI (Grant No. DMR-0420532, Dr. Charles Bouldin, monitor) and ONR-DURIP (Grant No. N00014-0400798, Dr. Julie Christodoulou, monitor) programs. Additionally, the LEAP tomograph was enhanced in late April 2006 with a picosecond laser with funding from ONR-DURIP (Grant No. N0014-06-1-0539). This work made use of Central Facilities supported by the MRSEC program of the National Science Foundation (Grant No. DMR-0520513) at the Materials Research Center of Northwestern University.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208-3108, USA

    Semyon Vaynman (Research Professor), Dieter Isheim (Research Assistant Professor), David N. Seidman (W.P. Murphy Professor) & Morris E. Fine (Professor, Member of Graduate Faculty)

  2. Northwestern University Center for Atom-Probe Tomography (NUCAPT), Northwestern University, Evanston, IL, 60208-3108, USA

    Dieter Isheim (Research Assistant Professor) & David N. Seidman (W.P. Murphy Professor)

  3. Global Customer Analytical Nalco Company, Naperville, IL, 60563, USA

    R. Prakash Kolli (Senior Metallurgist)

  4. ArcelorMittal Steel Global Research & Development, East Chicago, IN, 46312, USA

    Shrikant P. Bhat (Manager)

Authors
  1. Semyon Vaynman
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  2. Dieter Isheim
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  3. R. Prakash Kolli
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  4. Shrikant P. Bhat
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  5. David N. Seidman
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  6. Morris E. Fine
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Corresponding author

Correspondence to Semyon Vaynman.

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Manuscript submitted May 11, 2007.

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Vaynman, S., Isheim, D., Prakash Kolli, R. et al. High-Strength Low-Carbon Ferritic Steel Containing Cu-Fe-Ni-Al-Mn Precipitates. Metall Mater Trans A 39, 363–373 (2008). https://doi.org/10.1007/s11661-007-9417-x

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