Martensite crystal structure of nickel steel at cryogenic temperatures

Danil'chenko, V.E.; Сагарадзе, В. В.; I'Héritier, Ph.

doi:10.1016/s0921-5093(03)00301-0

Cited by 9 publications

(4 citation statements)

References 15 publications

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“…However, cryogenic toughness of the specimen treated by QLT was much higher than that of QT treated specimen, which is because the volume fraction of retained and reversed austenite was about 3 times of that of QT treated specimen. It was reported that cryogenic toughness was significantly improved by retained and reversed austenite [9,10] . Microstructure consisting of lath martensite with size about 10-20μm in the sample subjected to QT treatment before tension was shown in Fig.1.…”

Section: Resultsmentioning

confidence: 99%

Observation of Crack Evolution in Nickel steel of different Thermal Treatment

Li¹,

Wang²,

Tang³

2012

Proceedings of the 1st International Conference on Mechanical Engineering and Material Science

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Formation and propagation of crack in quenching+tempering(QT) and quenching+ intercritical quenching+ tempering (QLT) treated Fe-9%Ni-C alloys were investigated by means of in-situ scanning electron microscope (SEM) and transmission electron microscopy (TEM).The sample treated by QLT showed better cryogenic toughness than QT treatment. High content of retained and reversed austenite in QLT-treated alloy could be tested which located not only on the high angle grain boundaries such as prior austenite boundary and packet boundary but also within the laths which was stable during loading because of protection of harder phase. Retained and reversed austenite in QT treated alloy mainly located at high angle grain boundaries and was weak in stability during loading, could not improve cryogenic toughness of the alloy comparatively.

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Section: Resultsmentioning

confidence: 99%

Observation of Crack Evolution in Nickel steel of different Thermal Treatment

Li¹,

Wang²,

Tang³

2012

Proceedings of the 1st International Conference on Mechanical Engineering and Material Science

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“…The wide range of properties of Fe–Al–C alloys is defined by features of their structural-and-phase state, relative to other alloys of the Fe–Cr/V/Ni/Al/Ti–C systems [ 1 – 3 ], that forms during thermal and mechanical treatment and during the actions of other external factors. To specify the features of Fe–Al–C alloys it is necessary to note the solubility of carbon in the austenitic phase, the abnormally high tetrahonality of the martensitic phase containing nanoscale particles of the carbide phase, the coherency of this carbide phase with the austenitic matrix, which causes abnormally high tetrahonality of martensite, and increased resistance to disintegration of the carbon α-solid solution.…”

Section: Introductionmentioning

confidence: 99%

Substantiation of Epitaxial Growth of Diamond Crystals on the Surface of Carbide Fe3AlC0.66 Phase Nanoparticles

Dzevin

Mekhed

2017

Nanoscale Res Lett

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Samples of Fe–Al–C alloys of varying composition were synthesized under high pressures and temperatures. From X-ray analysis data, only K-phase with usual for it average parameter of elemental lattice cell, a = 0.376 nm, carbide Fe3C and cubic diamond reflexes were present before and after cooling to the temperature of liquid nitrogen.Calculations were made of the parameters of unit cells, the enthalpy of formation of the Fe3AlC, Fe3.125Al0.825C0.5, Fe3.5Al0.5C0.5, Fe3.5Al0.5C, Fe3Al0.66C0.66, and Fe3AlC0.66 unit cells and crystallographic planes were identified on which epitaxial growth of the diamond phase was possible, using density functional theory as implemented in the WIEN2k package.The possibility of epitaxial growth of diamond crystals on Fe3AlC0.66 (K-phase) nanoparticles was, therefore, demonstrated. The [200] plane was established to be the most suitable plane for diamond growth, having four carbon atoms arranged in a square and a central vacancy which can be occupied by carbon during thermal-and-pressure treatment. Distances between carbon atoms in the [200] plane differ by only 5% from distances between the carbon atoms of a diamond. The electronic structure and energetic parameters of the substrate were also investigated. It was shown that the substrate with at least four intermediate layers of K-phase exhibits signs of stability such as negative enthalpy of formation and the Fermi level falling to minimum densities of states.

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“…The volume fraction of nanoscale crystals is dependent on complex relationships of different factors—chemical composition of metastable alloys, rate of cooling and following heating in the course of the direct γ–α, and the reverse α–γ transformations, the number of the repeated γ–α–γ transformations (level of the phase hardening) [ 1 , 2 , 4 – 6 ]. Complexity of these processes calls for additional experimental investigations into formation of grain structure in reverted austenite upon cyclic martensitic transformations.…”

Section: Introductionmentioning

confidence: 99%

Ultrafine-Grained Structure of Fe-Ni-C Austenitic Alloy Formed by Phase Hardening

Danil'chenko¹

2016

Nanoscale Res Lett

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The X-ray and magnetometry methods were used to study α–γ transformation mechanisms on heating quenched Fe–22.7 wt.% Ni–0.58 wt.% С alloy. Variation of heating rate within 0.03–80 K/min allowed one to switch from diffusive to non-diffusive mechanism of the α–γ transformation. Heating up primary austenitic single crystal specimen at a rate of less than 1.0–0.5 K/min has led to formation of aggregate of grains with different orientation and chemical composition in the reverted austenite. Significant fraction of these grains was determined to have sizes within nanoscale range.

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Martensite crystal structure of nickel steel at cryogenic temperatures

Cited by 9 publications

References 15 publications

Observation of Crack Evolution in Nickel steel of different Thermal Treatment

Observation of Crack Evolution in Nickel steel of different Thermal Treatment

Substantiation of Epitaxial Growth of Diamond Crystals on the Surface of Carbide Fe3AlC0.66 Phase Nanoparticles

Ultrafine-Grained Structure of Fe-Ni-C Austenitic Alloy Formed by Phase Hardening

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