A study of interstitial atom configuration in fresh and aged iron-carbon martensite by mossbauer spectroscopy

Ino, Hiromitsu; Ito, Tetsu; Nasu, Saburo; Gonser, U.

doi:10.1016/0001-6160(82)90039-6

Cited by 45 publications

(28 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The B hf determined by MES for the η s resonance of samples ranged from 16.9 to 17.4 T, consistent with that of 17.4±0.5 T reported previously for this same alloy [19], and within the range of 16.2 [32] to 17.9 T [20] reported for η s . In [32] a distinction between ε or  was not made, but previous research suggests the resonance was due to  s [19]. The small fractions of the η s resonance necessitated the isomer shift (IS) and quadrupole splitting (QS) be fixed at 0.16 and -0.09 mm s -1 , respectively [19].…”

supporting

confidence: 90%

“…The small fractions of the η s resonance necessitated the isomer shift (IS) and quadrupole splitting (QS) be fixed at 0.16 and -0.09 mm s -1 , respectively [19]. The B hf of the η ns resonance ranged from 25.1 to 25.6 T, falling within the range of 23.7 to 25.7 T and reported previously [19,28,32]. Similarly, the small η ns resonance necessitated that the IS and QS be fixed at 0.13 and -0.36 mm s -1 [19], respectively.…”

mentioning

confidence: 57%

“…3b, while the RA C content exhibits a monotonic increase from approximately 4.3 at.% in QP400-10 to 6.1 at.% in QP400-300. MES spectra from a 5.0C at.% steel quenched and aged at 80C [32] exhibited no detectable carbide resonance, suggesting the increase in -carbide amount from QP400-30 to QP400-300 is due primarily to formation in the initial martensite during partitioning, rather than from FM.…”

mentioning

confidence: 98%

See 2 more Smart Citations

Quantitative investigation into the influence of temperature on carbide and austenite evolution during partitioning of a quenched and partitioned steel

et al. 2016

View full text Add to dashboard Cite

The influence of partitioning temperature on microstructural evolution during quenching and partitioning was investigated in a 0.38C-1.54Mn-1.48Si wt.% steel using Mössbauer spectroscopy and transmission electron microscopy. -carbide formation occurs in the martensite during the quenching, holding, and partitioning steps. More effective carbon partitioning from martensite to austenite was observed at 450 than 400 C, resulting in lower martensite carbon contents, less carbide formation, and greater retained austenite amounts for short partitioning times. Conversely, greater austenite decomposition occurs at 450 C for longer partitioning times. Cementite forms during austenite decomposition and in the martensite for longer partitioning times at 450 C. The quenching and partitioning (Q&P) steel heat treatment [1-3] produces microstructures containing primarily martensite (M) and retained austenite (RA) [4,5]. Q&P involves quenching to a quench temperature (QT) between the martensite start (M s) and finish temperatures, partitioning at a temperature (PT) the same or higher temperature than the QT, followed by a final quench (FQ) to room temperature (RT) [2,6]. The goal is to partition carbon (C) from martensite to austenite, thereby reducing the C supersaturation of the martensite and stabilizing the

show abstract

supporting

confidence: 90%

mentioning

confidence: 57%

mentioning

confidence: 98%

See 1 more Smart Citation

Quantitative investigation into the influence of temperature on carbide and austenite evolution during partitioning of a quenched and partitioned steel

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Upon tempering at 573 K for 1 hour (Figure 4(b)), a number of prominent peaks appeared in the diffraction patInvestigations carried out by several groups [7][8][9][10][11][12][13][14] reveal that the Mössbauer spectrum of fresh Fe-C martensite tern of the Fe-C sample. Most of the major new peaks can be indexed as that of the -Fe 3 C phase.…”

Section: A As-deposited Statementioning

confidence: 99%

On the nature of the electrochemically synthesized hard Fe-0.96 mass pct C alloy film

Haseeb

Hayashi

Masuda

et al. 2002

Metall Mater Trans B

View full text Add to dashboard Cite

A hard Fe-0.96 mass pct C alloy with a hardness value of 810 HV has been electrochemically synthesized from a ferrous sulfate bath containing a small amount of citric acid and L-ascorbic acid. The nature of the alloy has been investigated by a number of techniques, including X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Mössbauer spectroscopy, differential scanning calorimetry (DSC), and magnetic measurements. The decomposition behavior of the alloy is also studied and compared with that of thermally prepared martensite. It has been found that the electrochemically deposited Fe-C alloy exists in a state that is ahead of the freshly quenched state of martensite. It is suggested that the state of the electrochemically deposited Fe-0.96 mass pct C alloy corresponds to the state of thermal martensite, which had been heated to stage I of tempering.

show abstract

“…4,10 As noted above, rather than being stoichiometric Fe 4 C, the carbon-rich regions tended to have a carbon content closer to 10 at. %, 14 a point that was highlighted by Ino et al 15 who denoted it as Fe 4 C x with x Ӷ 1. Taylor et al 4 on the basis of their original TEM and atom probe data on Fe-Ni-C martensites along with previous work including Mössbauer spectroscopy proposed that instead of ␥Ј-Fe 4 C, the carbon-rich regions could be better described as ␣Љ-Fe 16 C 2 , which is isostructural to the metastable ␣Љ-Fe 16 N 2 nitride.…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics study of the ordering of carbon in highly supersaturatedα-Fe

et al. 2010

View full text Add to dashboard Cite

A recently developed Fe-C interatomic potential has been used to investigate carbon in highly supersaturated ␣ iron with an emphasis on the possible ways in which carbon can arrange itself on the octahedral sites of the tetragonally distorted ␣-iron lattice. Focusing particularly on the composition Fe 16 C 2 , the embedded atom method potential used gives the same ground-state structure of Fe 16 C 2 as density-functional-theory calculations. Moreover, when computing C-C interactions between two carbon atoms at 0 K with energy minimization, the preferred separation distance corresponds exactly to the octahedral site positions expected in Fe 16 C 2 . It has been shown with molecular dynamics that the carbon atoms in Fe 16 C 2 change how they order on octahedral sites during heating and during cooling. Finally, when investigating the interaction energy of Fe 1−x C x for different carbon compositions, it is found that there is a clear minimum at x = 0.11 for the fully ordered structure, corresponding to Fe 16 C 2 composition. The results of these calculations are discussed with particular reference to carbon ordering in ferrous martensite.

show abstract

A study of interstitial atom configuration in fresh and aged iron-carbon martensite by mossbauer spectroscopy

Cited by 45 publications

References 25 publications

Quantitative investigation into the influence of temperature on carbide and austenite evolution during partitioning of a quenched and partitioned steel

Quantitative investigation into the influence of temperature on carbide and austenite evolution during partitioning of a quenched and partitioned steel

On the nature of the electrochemically synthesized hard Fe-0.96 mass pct C alloy film

Molecular dynamics study of the ordering of carbon in highly supersaturatedα-Fe

Contact Info

Product

Resources

About