Determination of Aluminum Nitride Nitrogen in Steel

Beeghly, H. F.

doi:10.1021/ac60036a024

Cited by 97 publications

(14 citation statements)

References 7 publications

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“…Furthermore, there are considerable experimental difficulties in performing these measurements at high temperatures. Some authors rely on the Beeghly's, method [29] involving sample dissolution followed by filtering of the particles: the accuracy of this method is questioned because of its potential lack of sensitivity when very fine precipitates are present [1,2]. Others rely only on measurements of soluble nitrogen to calculate the amount of nitride precipitated.…”

Section: Precipitation In Austenite In Carbon Steelsmentioning

confidence: 99%

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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Section: Precipitation In Austenite In Carbon Steelsmentioning

confidence: 99%

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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“…The residues were examined by X-ray diffraction and the results are summarized in Table 2. The "combined" nitrogen contents of the alloys were determined using a 3g alloy sample weight by the Beeghly procedure [2] and the method described in BS l l21/Part 39, after fuming the extracted residue strongly in concentrated sulphuric acid. The results are given in Table 2.…”

Section: Nitride Residues From Ternary ( Fe -M-n) and Quaternary Allomentioning

confidence: 99%

“…However, the examination of many inclusions in this way is prohibitively long and for many purposes, it is better to extract the inclusions in bulk from the steel and subsequently examine them as a powdered sample. This paper is concerned with the identification and determination of nitrides present in such bulk extracted residues.Scholes and White [1 ] stated that with the exception of aluminium nitride [2], no reliable specific techniques exist for the quantitative determination of individual nitride phases, and more recently [3] the hitherto accepted Beeghly method [2] for aluminium nitride determination has been questioned. In the search for new approaches differential thermal decomposition was considered [1] to have potential and this has been developed [4][5][6][7] into a technique involving simulta--neous differential thermal analysis and evolved gas analysis, (DTA/EGA) for the examina~on of carbides, nitrides and sulphides present in residues extracted from steel.…”

mentioning

confidence: 99%

Identification of nitride inclusions in steel using differential thermal analysis and evolved gas analysis

Lloyd

Shanahan

1977

Journal of Thermal Analysis

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A preliminary study has been made of the feasibility of applying differential thermal analysis/evolved gas analysis (DTA/EGA) to the identification and estimation of nitrides in residues extracted from iron base alloys. A set of commercially available nitride powders have also been examined.The results showed that EGA traces are more informative than the DTA observations and, additionally, provide an estimate of the total nitrogen present. Residues from steels often contain elemental carbon and this complicates the interpretation of the DTA and EGA traces. It is generally concluded that the DTA/EGA technique is useful in identifying nitrides but should be ancilliary to other techniques such as X-ray diffraction.In recent years much effort has been given to the identification of non-metallic inclusions in steel since in some cases, these are known to exert important influences on chemical and physical properties. Particular attention has been directed to the quantitative analysis and morphology of carbides, nitrides and sulphides. In general, inclusions may be examined by in situ techniques, using for example the electron probe micro-analyser, or alternatively they may first be extracted from the steel by differential chemical attack and then submitted to a wide range of physical or chemical analytical techniques. The choice of approach depends on the information required. If it is important to determine the character of individual: inclusions then clearly in situ techniques are preferable. However, the examination of many inclusions in this way is prohibitively long and for many purposes, it is better to extract the inclusions in bulk from the steel and subsequently examine them as a powdered sample. This paper is concerned with the identification and determination of nitrides present in such bulk extracted residues.Scholes and White [1 ] stated that with the exception of aluminium nitride [2], no reliable specific techniques exist for the quantitative determination of individual nitride phases, and more recently [3] the hitherto accepted Beeghly method [2] for aluminium nitride determination has been questioned. In the search for new approaches differential thermal decomposition was considered [1] to have potential and this has been developed [4][5][6][7] into a technique involving simulta--neous differential thermal analysis and evolved gas analysis, (DTA/EGA) for the examina~on of carbides, nitrides and sulphides present in residues extracted from steel. White [8] used DTA/EGA to identify the nitrides isolated from two series.

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“…'rhcse eleme n ts wer e deLer .. m ined on drillin gs from the ingot at the base of the hot top. Ana]yses for n itrogen, oxygen , hy drogen, al uminum, aluminum nitride, and aluminum oxide were m a de a t the National Bureau of Standards on samples prepa red from the frac tured Charpy specimens by methods as follows: Total nitrogen, oxygen, aud hydrogen by vacuum fu sion ; aluminum nitride as described by Beeghl y [37]; aluminum oxide b y solution in H N O,; aluminum by spectrochem ical analysis. The determina tions J or the ga ses and their compound s a re comidered to he accura te to within a pproximately ± 0.001 pcrcent.…”

Section: Chemical Composition Of Steels-p3rcentage By Weightmentioning

confidence: 99%

Influence of nitrogen on the notch toughness of heat-treated 0.3-percent-carbon steels at low temperatures

Geil¹,

Carwile²,

Digges³

1952

J. RES. NATL. BUR. STAN.

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Charpy impact tests were made at te mperat ures ranging from -.1 96 0 t? + 10~0 C on fully hardened and te mpered specimens of O.3-percent-carbon steels with variable llltrogcn.The t ransition from ductile to brittle fractures was affected by bot h t he amount and form of t he nitrogen in t he steels. Fixation of t he nitrogen as aluminum nitride was beneficial as t he aluminum-treated steels had considerably lower t ransition temperatures than thos~ of the steels not treated with aluminum.

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Determination of Aluminum Nitride Nitrogen in Steel

Cited by 97 publications

References 7 publications

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

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

Identification of nitride inclusions in steel using differential thermal analysis and evolved gas analysis

Influence of nitrogen on the notch toughness of heat-treated 0.3-percent-carbon steels at low temperatures

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