An atom probe study of the aging of iron-nickel-carbon martensite

Miller, M.K.; Beaven, P. A.; Brenner, S.S.; Smith, George Adam

doi:10.1007/bf02670440

Cited by 23 publications

(23 citation statements)

References 13 publications

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“…Redistribution of carbon in the early stages of tempering has been studied by Miller et al [20][21][22] for iron-carbon and iron-nickel-carbon alloys. It was observed that carbon segregates to lattice defects such as coherent twin boundaries, lath boundaries, and high-angle grain boundaries.…”

Section: Introductionmentioning

confidence: 99%

Tempering of Low-Temperature Bainite

Peet

Babu

Miller

et al. 2017

Metall Mater Trans A

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Electron microscopy, X-ray diffraction, and atom probe tomography have been used to identify the changes which occur during the tempering of a carbide-free bainitic steel transformed at 473 K (200 °C). Partitioning of solute between ferrite and thin-films of retained austenite was observed on tempering at 673 K (400 °C) for 30 minutes. After tempering at 673 K (400 °C) and 773 K (500 °C) for 30 minutes, cementite was observed in the form of nanometre scale precipitates. Proximity histograms showed that the partitioning of solutes other than silicon from the cementite was slight at 673 K (400 °C) and more obvious at 773 K (500 °C). In both cases, the nanometre scale carbides are greatly depleted in silicon.

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Section: Introductionmentioning

confidence: 99%

Tempering of Low-Temperature Bainite

Peet

Babu

Miller

et al. 2017

Metall Mater Trans A

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“…[1][2][3][4][5][6] However, prior to tempering of martensite, room-temperature aging or autotempering of martensite formed at high temperatures on quenching takes place. [3,4,[7][8][9][10] This process is associated with carbon segregation to dislocations and twin boundaries, to and from retained austenite films, the formation of a periodic tweed structure consisting of carbon modulations in Ni-containing martensites, and carbon clustering before the precipitation of iron-carbide. [7][8][9][10][11] Several experimental techniques, such as electrical resistivity measurements, X-ray diffraction (XRD), transmission electron microscopy, Mo¨ssbauer spectroscopy, and atom probe field ion microscopy, have been used to understand the mechanisms and stages of aging and tempering in low-and high-carbon martensitic steels.…”

mentioning

confidence: 99%

“…[3,4,[7][8][9][10] This process is associated with carbon segregation to dislocations and twin boundaries, to and from retained austenite films, the formation of a periodic tweed structure consisting of carbon modulations in Ni-containing martensites, and carbon clustering before the precipitation of iron-carbide. [7][8][9][10][11] Several experimental techniques, such as electrical resistivity measurements, X-ray diffraction (XRD), transmission electron microscopy, Mo¨ssbauer spectroscopy, and atom probe field ion microscopy, have been used to understand the mechanisms and stages of aging and tempering in low-and high-carbon martensitic steels. Previous atom probe studies of martensite decomposition have used atom probe field ion microscopes, which have a severe limitation on the volume of material analyzed.…”

mentioning

confidence: 99%

On the Decomposition of Martensite during Bake Hardening of Thermomechanically Processed Transformation-Induced Plasticity Steels

Pereloma

Miller

Timokhina

2008

Metall Mater Trans A

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Thermomechanically processed (TMP) CMnSi transformation-induced plasticity (TRIP) steels with and without additions of Nb, Mo, or Al were subjected to prestraining and bake hardening. Atom probe tomography (APT) revealed the presence of fine C-rich clusters in the martensite of all studied steels after the thermomechanical processing. After bake hardening, the formation of iron carbides, containing from 25 to 90 at. pct C, was observed. The evolution of iron carbide compositions was independent of steel composition and was a function of carbide size.

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“…C2+, C32+ and C3+ [20,21]. The interpretation of this phenomenon has been discussed in several papers, especially in investigations of martensite [22,23]. It is still not known whether the carbon complex ions are clustered in the material prior to analysis or form on the surface of the specimen under the influence of the applied field.…”

Section: Field Evaporation Of Carbonmentioning

confidence: 99%

On APFIM of Grain Boundaries in a Nickel Base Superalloy

Thuvander

Stiller

1996

J. Phys. IV France

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Abstract. Experimental details of atom probe field ion microscopy (APFIM) of a Ni-16Cr-9Fe alloy are presented. In particular, studies concerning analysis of intergranular carbides and borides and segregation to grain boundaries are described. It was found that NiZ3B6 precipitates are very sensitive to preferential field evaporation, which necessitates optimization of the analysis conditions. In the FIM images, nickel-and boron-rich precipitates exhibited either dark or bright contrast with respect to the austenitic matrix. Analysis of a grain boundary that contained a high level of segregated carbon, revealed that carbon is partially field evaporated as complex ions. In this analysis, chromium and carbon often appeared next to each other in the ion chain. Together, these two observations indicate nucleation of chromium carbides, which are known to form after extended heat treatment at the applied temperature (600°C).

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An atom probe study of the aging of iron-nickel-carbon martensite

Cited by 23 publications

References 13 publications

Tempering of Low-Temperature Bainite

Tempering of Low-Temperature Bainite

On the Decomposition of Martensite during Bake Hardening of Thermomechanically Processed Transformation-Induced Plasticity Steels

On APFIM of Grain Boundaries in a Nickel Base Superalloy

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