AlN Precipitation During Isothermal Annealing of Ultra Low Carbon Steel

Radis, Rene; Schwarz, Sabine; Zamberger, Sabine; Kozeschnik, Ernst

doi:10.1002/srin.201000289

Cited by 19 publications

(23 citation statements)

References 32 publications

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“…A comparable reduction of the calculat- d) Calculated using G=78 GPa and b=0.203 nm ed interfacial energy value of the planar, sharp interface was also reported for the ordered, coherent fcc-L12-phase in Nibase alloys, 31) although the unmodified values for γ 0 have been successfully used in numerous other works for carbides, nitrides and even complex carbo-nitrides. [25][26][27]32) The physical reason for this necessary reduction of effective interfacial energy for some types of precipitates, as used in the present analysis, is not fully understood. However, it might be argued and justified on the basis of entropic contributions in a diffuse interface 33) as generally observed for ordered precipitates.…”

Section: αV(ph)=2·10mentioning

confidence: 98%

“…Refs. 19,20,[25][26][27] In Table 1, a reduction of the interfacial energy value used in the simulations is reported compared to the predicted value of the planar, sharp interface, γ 0. An effective value of 70% has been used in the present simulations in order to reproduce the experimental number densities and radii of the B2 precipitates.…”

Section: αV(ph)=2·10mentioning

confidence: 99%

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Simulation of Precipitation Kinetics and Precipitation Strengthening of B2-precipitates in Martensitic PH 13–8 Mo Steel

Povoden-Karadeniz¹,

Kozeschnik²

2012

ISIJ Int.

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Section: αV(ph)=2·10mentioning

confidence: 98%

Section: αV(ph)=2·10mentioning

confidence: 99%

Simulation of Precipitation Kinetics and Precipitation Strengthening of B2-precipitates in Martensitic PH 13–8 Mo Steel

Povoden-Karadeniz¹,

Kozeschnik²

2012

ISIJ Int.

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“…Compilation of TTT information on precipitation of AlN in annealed austenite. Radis and coworkers [4] (experiments where AlN was observed in TEM) Meyrhoffer [19] (50% vf precipitated) (similar steels, with around 0.12%Al and 57ppm N) and Vodopivec [30] (experimental, start and finish of precipitation, steel with around 0.05%Al and 50ppm N). order of magnitude of the values reported by Murr [23] for M 23 C 6 in austenite.…”

Section: A Costa E Silva Et Al / Jmm 48 (3) B (2012) 471 -476mentioning

confidence: 98%

“…Others rely only on measurements of soluble nitrogen to calculate the amount of nitride precipitated. On the other hand, Radis and coworkers [4] superimposed on their calculated TTT curve points indicating the presence or absence of AlN, after TEM observation.…”

Section: Precipitation In Austenite In Carbon Steelsmentioning

confidence: 99%

“…This was of importance to establish the basis for any attempt at modeling the kinetics of precipitation and dissolution of this compound in steels. The series of publications by Kozerschnik and co-workers [4,5,6] has marked a significant advance in the modeling of this precipitation reaction in steel. Furthermore, the availability of a computational tool for simulating multi-particle precipitation kinetics of diffusioncontrolled processes in multi-component and multiphase alloy systems [7] has stimulated an effort to evaluate the possibility of describing the precipitation kinetics of this compound in a reasonably accessible way.…”

Section: Introductionmentioning

confidence: 99%

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Application of computational modeling to the kinetics of precipitation of aluminum nitride in steels

Silva

Nakamura²,

Rizzo

2012

J min metall B Metall

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In previous works the possibilities and limitations of the application of calculations in the Al-Fe-N system to describe the precipitation of AlN in steel, both in the solid state and during the solidification were discussed and some difficulties related to the extension of these calculations to more complex steel systems, due to limitations in the thermodynamic data were also presented. Presently, the precipitation kinetics of AlN in ferrite (BCC) and austenite (FCC) is discussed. The correct description of the precipitation of AlN in both phases is relevant to: (a) the precipitation at higher temperatures, in the austenite field, that occurs in some steels, (b) the concurrent precipitation of this nitride with the annealing treatment, when the steel is mostly ferritic, used in the processing of some types of deep drawing steels (c) the precipitation of this nitride in some silicon alloyed electric steels at relatively high temperatures, when these steels can have significant fractions of BCC and FCC in their microstructure. The precise knowledge of the precipitation-dissolution behavior of AlN in special in these two latter classes of steels is of great importance to their correct processing. In this work, a computational tool for simulating multiparticle precipitation kinetics of diffusion-controlled processes in multi-component and multi-phase alloy systems is employed in an attempt to describe these precipitation processes. The results are compared with experimental data on precipitation. The assumptions necessary for the application of the multi-particle modeling tool are discussed, agreements and discrepancies are identified and some possible reasons for these are indicated. Furthermore, the impact of the use of different sources of data on steel processing development is discussed and the need for further studies highlighted

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Palladium‐Catalyzed C3 or C4 Direct Arylation of Heteroaromatic Compounds with Aryl Halides by CH Bond Activation

2010

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In recent years, palladium‐catalyzed direct C2 or C5 arylation of heteroaromatic compounds with aryl halides by CH bond activation has become a popular method for generating carbon–carbon bonds. For this reaction, a wide variety of heteroaromatics, such as furans, thiophenes, pyrroles, thiazoles, oxazoles, imidazoles, pyrazoles, indoles, triazoles, or even pyridines, can be employed. C3 and C4 arylations of heteroaromatics by CH bond activation have also been described. Such reactions initially attracted much less attention than the C2 or C5 arylations due to the lower reactivity of the C3 and C4 positions. How‐ ever, in more recent years, several results from using modified and improved catalysts and reaction conditions have been reported, which permit C3 and C4 arylations in synthetically useful yields. Several intramolecular cyclizations of 2‐substituted heterocycles have been described, with formation of a CC bond on C3 resulting in the formation of five‐ to nine‐membered rings incorporating pyrroles, indoles, thiophenes, furans, isoxazoles, or pyridines. Intermolecular C3 or C4 direct arylations are still quite rare for some heteroaromatics and are in several cases not highly regioselective. For such reactions, the best results have been obtained using pyrroles, thiophenes, or furans. For selected substrates, regioselective arylation at C3 or C4 of the heteroaromatic compounds took place under appropriate reaction conditions. Only a few examples of intermolecular couplings using oxazoles, thiazoles, imidazoles, isoxazoles, pyrazoles, triazoles, or pyridines have been reported. For most of these reactions, aryl iodides or bromides have been used as coupling partners, although a few examples with aryl chlorides are also known. This method allows the synthesis of complex molecules in only a few steps, and will provide access to a very wide variety of new heteroaryl derivatives in the next years.

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AlN Precipitation During Isothermal Annealing of Ultra Low Carbon Steel

Cited by 19 publications

References 32 publications

Simulation of Precipitation Kinetics and Precipitation Strengthening of B2-precipitates in Martensitic PH 13–8 Mo Steel

Simulation of Precipitation Kinetics and Precipitation Strengthening of B2-precipitates in Martensitic PH 13–8 Mo Steel

Application of computational modeling to the kinetics of precipitation of aluminum nitride in steels

Palladium‐Catalyzed C3 or C4 Direct Arylation of Heteroaromatic Compounds with Aryl Halides by CH Bond Activation

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