Austenite-to-martenzite transformations in ledebourite-type powder steels

Miglierini, Marcel

doi:10.1007/s10582-005-0083-1

Cited by 7 publications

(4 citation statements)

References 8 publications

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“…A dramatic decrease of relative contribution of magnetic phases is observed with rising size of RS particles. This behaviour is different from that observed for ledeburite-type powder steels [8] where practically no change in the relative contents of non-magnetic (austenite) and/or magnetic phase was found. In the present case, no magnetic component is identified in RT transmission Mössbauer spectra of RS particles bigger than 63 μm while the LNT TMS point out that this might be simply methodological aspect (Fig.…”

Section: Resultscontrasting

confidence: 99%

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Characterization of rapidly solidified powder of high-speed steel

2009

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Rapidly solidified particles of high-speed steel were classified into several granulometric fractions ranging from less than 25 μm up to more than 160 μm in diameter and studied by transmission and conversion electron Mössbauer spectrometry. The former was applied at 300, 77, and 5 K. Presence of magnetic and a non-magnetic crystallographic phase was observed. They were identified by X-ray diffraction as ferrite (bcc-Fe) and austenite (fcc-Fe), respectively. In addition, M 4 C 3 and M 2 C carbides were found. The magnetic phase diminishes in the bulk of the particles bigger than 63 μm (transmission Mössbauer spectroscopy) and/or 80 μm (X-ray diffraction). Its contribution is higher at the surface of the particles (conversion electron Mössbauer spectrometry). The origin of the non-magnetic phase is not changed even at 5 K. Reasonable agreement is achieved between Mössbauer and X-ray diffraction data as far as the fraction of Fe-containing phases is concerned.

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Section: Resultscontrasting

confidence: 99%

“…In addition we were interested in identification of possible differences in phase composition at the surface and in the bulk of the rapidly solidified particles as a function of their size. Recently we have used Mössbauer spectrometry (MS) for similar studies of rapidly solidified (RS) particles [8].…”

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Characterization of rapidly solidified powder of high-speed steel

2009

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“…Different types of alloys are suitable for advanced applications, and therefore, it is necessary to analyse them using different experimental nuclear-physical techniques [1][2][3][4][5][6][7][8][9]. Undoubtedly, the most important alloys used in the primary circuit are anti-corrosion steels, where, in addition to carbon, other elements, such as chromium, manganese, nickel, and titanium, are added to improve their physical, chemical, and mechanical properties [10][11][12][13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Precipitation of oxide dispersion strength steels after long-term annealing at temperature of 475 °C

Košovský,

Miglierini,

Kmječ

et al. 2024

Acta Polytech

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Oxide dispersion strengthened steels are key alloys used in nuclear installations. Steels with chromium content of up to 10 wt % are suitable due to their advantageous properties and these alloys are used for the construction of technological devices in the primary circuit of nuclear power plants. From other studies, it can be concluded that chromium has anti-corrosive properties due to the formation of a passivation layer, which results in reduced activation of the material by thermal neutrons. Macroscopic properties are determined by their microstructure, and therefore, the description of the microstructure is important. Transmission Mössbauer spectroscopy and atom probe tomography were used to characterise the material. This provides information about the physical and/or chemical environment of the resonant atoms can be obtained. Obtained spectral parameters reach saturation values from which the solubility limit of chromium in iron can be determined. In Cr-rich phase, the solubility limit can be estimated from the value of spectral parameters of the single-line in the spectrum annealed for the longest time. The suggested procedures are subsequently applied to the case studies of stainless steels suitable for the construction of various components of the III+/IVth generation of nuclear reactors (including fast and fusion reactors).

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“…[1][2][3][4][5][6][7][8][9][10][11] Various types of alloys are potentially suitable for advanced (nuclear) applications; therefore, it is necessary to analyze suitable candidates using variety of experimental techniques in order to understand the microstructure and potential irradiation resistance of a given material. [12][13][14][15][16][17][18][19][20][21] The most common alloys used in the primary circuit of nuclear power plants are steels, where carbon, chromium, manganese, nickel, titanium, and other elements (additives) are added in order to improve their physical, chemical, and mechanical properties. [14,[22][23][24][25][26][27][28] Purposeful choice of construction material reflects the type of nuclear facility, i.e., the type of nuclear reactor or the type of coolant/cooling system.…”

Section: Introductionmentioning

confidence: 99%

Microstructure of High‐Chromium Ferritic–Martensitic Steels for Next‐Generation Reactors

Košovský,

Dekan,

Sedlačková

et al. 2023

Physica Status Solidi (b)

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High‐chromium steels are key alloys used for the construction of technological devices in industry. Stainless steels are suitable for components that are exposed to a corrosive environment for a long time because chromium has anticorrosion properties due to segregation of chromium and the formation of a passivation layer. The physicochemical properties of the surface and the bulk of the material as well are determined by microstructure. Herein, steel NS219 is focused on, where the chromium concentration is around 13.5 wt%. In order to study the microstructure of steel, Mössbauer spectroscopy is used. Experimental results are evaluated using the binomial distribution model of the probability distribution of atoms in the nearest neighbor of the resonant atom 57Fe. Obtained spectral parameters, viz., the average magnetic hyperfine field, the average isomer shift, and the probability of the atomic configuration with no impurity atoms in the two‐shell vicinity of the iron atoms, reach saturation values from which the solubility limit of chromium in iron can be determined. On the other hand, the solubility limit of iron in Cr‐rich phase can be estimated from the value of the isomer shift of the single‐line in the spectrum annealed for the longest time.

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Austenite-to-martenzite transformations in ledebourite-type powder steels

Cited by 7 publications

References 8 publications

Characterization of rapidly solidified powder of high-speed steel

Characterization of rapidly solidified powder of high-speed steel

Precipitation of oxide dispersion strength steels after long-term annealing at temperature of 475 °C

Microstructure of High‐Chromium Ferritic–Martensitic Steels for Next‐Generation Reactors

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