Axial ratio of an Fe–30Ni–0.23C bct martensite determined by neutron diffraction

Tomota, Yō; Tokuda, H; Torii, S.; Kamiyama, Takashi

doi:10.1016/j.msea.2006.06.067

Cited by 11 publications

(5 citation statements)

References 4 publications

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“…Then, a combined function composed of Gauss, Lorentz, and exponential functions was introduced. [3,11] The fitting curve by the combined function reproduces satisfactorily the observed peak shape. The determined value of d 111 for SS304 is 2.07471(8) Å .…”

Section: A Neutron Diffractionsupporting

confidence: 62%

“…Martensitic transformation in Fe-30Ni-0.23C steel was investigated by in-situ neutron diffraction between 300 K and 100 K (27°C and -173°C) (the M s temperature is 216 K (-57°C)). [3] The obtained diffraction data indicate a high axial ratio of c/a = 1.0254 in freshly formed bct martensite; the decrease of c/a in tempering suggests carbon diffusion even below room temperature and remarkable diffraction peak broadening both in the newly formed martensite and the coexisting austenite due to the internal strain in the alloy.…”

Section: Introductionmentioning

confidence: 81%

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Position Dependence of SS304 and Iron Phases in Welded Specimen by Neutron Diffraction and Bragg-Edge Transmission Method

Iwase

Sato

Mori

et al. 2011

Metall Mater Trans A

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We investigated the nondestructive examination method by neutron scattering. A welded plate of SS304 (fcc) and iron (bcc) was investigated using neutron diffraction and the Bragg-edge transmission method. We tried to clear the positions of the welded area, SS304 phase, and iron phase and to determine the lattice spacing. The determined value of d 111 for SS304 is 2.07471(8) Å using neutron diffraction. With Bragg-edge transmission, it is possible to collect the information of a specimen as two-dimensional (2-D) images using a 2-D position sensitive detector at a pulse neutron source. The determined d 111 of SS304 phase indicates between 2.0745(8) and 2.0752(9) Å depending on the measurement points using Bragg-edge transmission. The same tendency was also seen in iron phase. The determined d 110 of the iron phase is 2.02802(1) Å using neutron diffraction. The determined d 110 of iron phase indicates between 2.0266(7) and 2.0321(13) Å using Bragg-edge transmission. The determined d using diffraction exists within that of Bragg-edge transmission. In order to clarify the position dependency of the phase and lattice spacing, the combined diffraction and Bragg-edge transmission is effective.

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Section: A Neutron Diffractionsupporting

confidence: 62%

Section: Introductionmentioning

confidence: 81%

Position Dependence of SS304 and Iron Phases in Welded Specimen by Neutron Diffraction and Bragg-Edge Transmission Method

Iwase

Sato

Mori

et al. 2011

Metall Mater Trans A

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“…to re-evaluate the changes in the lattice constant of austenite during martensitic transformation 8,17,18) , tetragonality 19) , and the transformation and deformation behavior of martensite 20) . There are several reports on martensitic transformation behavior during quenching from high temperatures 8,17,18) .…”

Section: Introductionmentioning

confidence: 99%

Martensitic Transformation Behavior of Fe–Ni–C Alloys Monitored by <i>In-situ</i> Neutron Diffraction during Cryogenic Cooling

et al. 2024

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In-situ neutron diffraction measurements were performed on Fe-33Ni-0.004C alloy (33Ni alloy) and Fe-27Ni-0.5C alloy (27Ni-0.5C alloy) during cooling from room temperature to the cryogenic temperature (4 K) to evaluate changes in the lattice constants of austenite and martensite, and changes in the tetragonality of martensite due to thermally induced martensitic transformation.As the martensitic transformation progressed, the lattice constants of austenite in both alloys deviated to smaller values than those predicted considering the thermal shrinkage, accompanied by an increase in the full width at half maximum of austenite. The fresh martensite formed in both alloys had a body-centered tetragonal (BCT) structure, regardless of the carbon content. The tetragonality of martensite decreased with progressive martensitic transformation during cooling in the 33Ni alloy, but was almost constant in the 27Ni-0.5C alloy. This suggests that carbon is necessary to maintain the tetragonality of martensite during cooling. The tetragonality of martensite in the 27Ni-0.5C alloy decreased during room temperature aging because of carbon mobility.

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“…Neutron diffraction has been demonstrated to give the globally averaged volume fraction of metastable austenite. 9,10) …”

Section: Introductionmentioning

confidence: 99%

Unusual Tempering Behavior of Fe–Cr–C Martensite

Shi

Tomota

et al. 2015

ISIJ Int.

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The tempering behavior of an as-quenched high Cr-high C steel consisting of lath martensite, retained austenite and carbide was studied. The change in the total austenite volume fraction was monitored during tempering by in situ neutron diffraction. The results were compared with those obtained by X-ray diffraction, scanning electron microscopy/electron back scatter diffraction and transmission electron microscopy observations and ex situ neutron diffraction. The volume fraction of the blocky austenite grains increased by tempering at 573 K, whereas the thin film austenite decomposed to ferrite and cementite. The tempering behavior of the blocky austenite grains is an unusual phenomenon.

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Axial ratio of an Fe–30Ni–0.23C bct martensite determined by neutron diffraction

Cited by 11 publications

References 4 publications

Position Dependence of SS304 and Iron Phases in Welded Specimen by Neutron Diffraction and Bragg-Edge Transmission Method

Position Dependence of SS304 and Iron Phases in Welded Specimen by Neutron Diffraction and Bragg-Edge Transmission Method

Martensitic Transformation Behavior of Fe–Ni–C Alloys Monitored by <i>In-situ</i> Neutron Diffraction during Cryogenic Cooling

Unusual Tempering Behavior of Fe–Cr–C Martensite

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