Comparison of Precipitation Kinetics and Strengthening in an Fe-0.8%Cu Alloy and a 0.8% Cu-containing Low-carbon Steel

Deschamps, A.; Militzer, Matthias; Poole, Warren J.

doi:10.2355/isijinternational.43.1826

Cited by 33 publications

(19 citation statements)

References 14 publications

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“…12,[30][31][32] Both the peak hardness and the aging time to peak are in between those reported for 0.8 wt % Cu ͑Ref. 30͒ and for 1.3 wt % Cu, 12 and very close to that reported for 1.0 wt % Cu.…”

Section: A Aging Curvessupporting

confidence: 81%

Thermally activated precipitation at deformation-induced defects in Fe-Cu and Fe-Cu-B-N alloys studied by positron annihilation spectroscopy

Dijk

Schüt

et al. 2010

Phys. Rev. B

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We have investigated the influence of deformation-induced defects on the isothermal precipitation at 550°C in as-quenched ͑solute-supersaturated͒ and annealed ͑solute-depleted͒ Fe-Cu and Fe-Cu-B-N alloys by positron annihilation spectroscopy and hardness tests. Using the coincidence Doppler broadening technique, the evolution of local environment at the positron annihilation sites ͑open-volume defects, Cu precipitates, and matrix͒ was monitored as a function of the aging time. For all samples, plastic deformation causes a pronounced change in S and W parameters signaling the formation of open-volume defects. For the as-quenched samples, aging results in a sharp decrease in the amount of open-volume defects combined with the rise of a strong copper signature, which can be attributed to preferential copper precipitation at the open-volume defects introduced by plastic deformation. In contrast, the open-volume defects of the annealed samples can only be reduced partially. Both the hardness tests and the positron annihilation spectroscopy indicate that the addition of B and N to the Fe-Cu alloy causes a significant acceleration of the precipitation in the as-quenched alloys.

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Section: A Aging Curvessupporting

confidence: 81%

Thermally activated precipitation at deformation-induced defects in Fe-Cu and Fe-Cu-B-N alloys studied by positron annihilation spectroscopy

Dijk

Schüt

et al. 2010

Phys. Rev. B

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“…A number of analytical techniques exist by which fine precipitates in low alloyed steels can be analyzed; these include scanning electron microscopy (SEM), transmission electron microscopy (TEM), [3,4,9,10] small angle x-ray scattering (SAXS), [10,11] and small angle neutron scattering (SANS). [9,[12][13][14] Traditional SEM is generally limited to large size precipitates (>50 nm), although field emission SEM has the capabilities of examining finer precipitates (<10 nm).…”

Section: Introductionmentioning

confidence: 99%

The Effects of Finish Rolling Temperature and Cooling Interrupt Conditions on Precipitation in Microalloyed Steels Using Small Angle Neutron Scattering

Wiskel

Ivey

Henein

2007

Metall Mater Trans B

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Small angle neutron scattering (SANS) was used to quantify the precipitate characteristics (i.e., mean precipitate size, number of precipitates, and distribution broadening) in X-70 and X-80 pipeline steel and in grades 80 and 100 microalloyed steel plate. The precipitate distributions measured for the different steels were correlated with the finish rolling temperature (FRT) and cooling interrupt temperature (CT) as a means of identifying processing conditions that may enhance fine precipitate evolution. It was observed that for some combinations of processing conditions two distinct precipitation events-based on size of the precipitates-were occurring. The first precipitation event (larger size) was strongly associated with the FRT, where a decrease in the mean precipitate radius with decreasing FRT was observed. The second (finer size) precipitation event was affected by both the CT and the FRT. Both the size and volume of the second precipitation event was observed to decrease with decreasing CT. The precipitate distribution predicted from the SANS data for grade 100 steel compared favorably to precipitation data obtained from particle counting analysis conducted with a transmission electron microscopy (TEM).

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“…13-16 and 27͒ and small-angle x-ray scattering ͑SAXS͒ experiments, 28,29 limited information is available on the precipitation behavior before peak aging. Previous SANS and SAXS experiments were all performed ex situ ͑at room temperature͒ and neither concentrate on the effect of deformation on the Cu precipitation nor on the addition of B and N.…”

Section: Introductionmentioning

confidence: 99%

In situdetermination of aging precipitation in deformed Fe-Cu and Fe-Cu-B-N alloys by time-resolved small-angle neutron scattering

Dijk

Paladugu

et al. 2010

Phys. Rev. B

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We performed in situ time-resolved small-angle neutron scattering ͑SANS͒ measurements on high-purity Fe-Cu and Fe-Cu-B-N alloys during isothermal aging at 550°C in order to study the potential self-healing of deformation-induced defects by nanosized Cu precipitation. Three different samples with 0%, 8%, and 24% prestrain were used to study the influence of variable defect levels on the Cu precipitation kinetics. The time-resolved SANS measurements show the presence of two contributions corresponding to spherical precipitates and precipitation at dislocations and/or interfaces, as confirmed by complementary transmission electron microscopy experiments. For the Fe-Cu alloy, prestrain was found to accelerate the formation of spherical precipitates in initial aging stage and lead to a significant enhancement of copper precipitation at dislocations and/or interfaces. For the Fe-Cu-B-N alloy, the addition of boron and nitrogen accelerates the formation of spherical precipitates but suppresses the precipitation along dislocations in the prestrained samples.

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Comparison of Precipitation Kinetics and Strengthening in an Fe-0.8%Cu Alloy and a 0.8% Cu-containing Low-carbon Steel

Cited by 33 publications

References 14 publications

Thermally activated precipitation at deformation-induced defects in Fe-Cu and Fe-Cu-B-N alloys studied by positron annihilation spectroscopy

Thermally activated precipitation at deformation-induced defects in Fe-Cu and Fe-Cu-B-N alloys studied by positron annihilation spectroscopy

The Effects of Finish Rolling Temperature and Cooling Interrupt Conditions on Precipitation in Microalloyed Steels Using Small Angle Neutron Scattering

In situdetermination of aging precipitation in deformed Fe-Cu and Fe-Cu-B-N alloys by time-resolved small-angle neutron scattering

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