Aluminium nitride in steel

Wilson, F. G.; Gladman, T.

doi:10.1179/imr.1988.33.1.221

Cited by 171 publications

(95 citation statements)

References 74 publications

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“…One kind of these particles is Al 2 O 3 particle with an irregular geometric morphology, while the other one is AlN precipitate with a hexagonal structure, which was also seen in other nitrogen-containing austenitic stainless steels. 15,16) Actually, when melting the raw material, slag containing Al 2 O 3 was added during electroslag remelting to the steel. Considering that Al 2 O 3 will hardly precipitate in HNASSs at normal procedure, it can be sure that Al 2 O 3 particles observed in specimens are not precipitates but inclusions introduced during melting, and they can appear both in grains and at GBs.…”

Section: ¹1mentioning

confidence: 99%

Plastic Deformation and Damage Behaviors of Fe-18Cr-18Mn-0.63N High-Nitrogen Austenitic Stainless Steel under Uniaxial Tension and Compression

et al. 2015

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Uniaxial tensile and compressive deformation behaviors of Fe-18Cr-18Mn-0.63N high-nitrogen austenitic stainless steel were investigated at different strain rates. It is found that, with increasing strain rate, the yield strength of the steel increases either under tension or compression, while the ultimate tensile strength and the total elongation decrease under tension. The plastic deformation behavior prior to necking under uniaxial tension at different strain rates can be well described by the modified Ludwik relation. Under tensile deformation at the low strain rate of 10 ¹4 s ¹1, microcracks prefer to initiate around the Al 2 O 3 particles in the steel, whereas cracks nucleate at grain boundaries or along slip bands at the high strain rate of 10 ¹2 s ¹1. Compressive deformation behavior of the steel is not so sensitive to the strain rate. The surface fluctuation is more serious under compressive deformation rather than tensile deformation. The tensile plastic deformation is mainly governed by the formation of planar slip bands and deformation twins, and deformation by twinning becomes more prominent with increasing strain rate, while dislocation slip featured by planar slip bands, dislocation bands and twin-like bands basically controls the compressive plastic deformation, and deformation twins are rarely formed.

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Section: ¹1mentioning

confidence: 99%

Plastic Deformation and Damage Behaviors of Fe-18Cr-18Mn-0.63N High-Nitrogen Austenitic Stainless Steel under Uniaxial Tension and Compression

et al. 2015

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“…For example, comparatively low solubility of AlN as well as relative high mobility of nitrogen and aluminium in body centered cubic (BCC) iron may allow rapid precipitation of AlN particles during low temperature hot rolling, which may influence recrystallization and grain growth kinetics. For low C-Mn steel (C: 0.031%, Mn: 0.25%, Al: 0.05%; and N: 50 ppm), it has been reported [10] that when steel specimens were reheated to 1232 C and hot deformed in ferritic region, they did not fully recrystallized even when coiling temperature was maintained at 677 C. However, when reheated at 1100 C and hot deformed in ferritic region, it recrystallized fully after adhering to identical coiling temperature of 677 C. The results of the above study have been explained in terms of precipitation of AlN [11]. At low reheating temperatures, a portion of previously formed particles (which occurred in coarse form due to slow cooling of slab) will remain undissolved.…”

Section: Effect Of Finishing and Coiling Temperaturesmentioning

confidence: 50%

“…Therefore, maintaining reheating temperature at 1200 C, it would be possible to attain equilibrium solubility for both AlN and BN, and during processing BN will precipitate predominantly owing to high mobility of boron [11] and lower solubility of BN compared to AlN at lower temperature. This means that AlN in the steel will appear as coarse and will have small FPP similar to that observed in steel reheated at temperature 1100 C without addition of boron in the steel.…”

Section: Effect Of Finishing and Coiling Temperaturesmentioning

confidence: 99%

Microstructural Control in Aluminium-Killed Low C-Mn Boron Containing Steel for Improved Formability and Cold Reducing Properties

Deva¹,

Kumar²,

De³

et al. 2010

Materials and Manufacturing Processes

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Microstructural control through thermo-mechanical simulation has been attempted in aluminum-killed low carbon-manganese boron containing steel. The results from dilatometric studies were used to explain austenite decomposition characteristics under different soaking temperatures and cooling rates. A significant lowering in Ar 3 temperature was observed when the steel was soaked at 1200 C followed by rapid cooling (20 C/sec). On the contrary, no appreciable change in Ar 3 temperature was noticed when soaking temperature was brought down to 950 C. Hot rolling simulations were carried out both in austenitic and ferritic regions to understand microstructural evolution. Ferritic hot rolling at 750 C followed by coiling at 650 C exhibited formation of coarse recrystallized ferrite grains of 30 micron, which is ideally suited for cold forming and reducing applications.

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“…[1]). These include the control of the austenitic grain size during heat treatment and hot work as well as controlling or influencing texture in aluminum killed formable steel and effecting grain size and other properties in high silicon steels.…”

Section: Introductionmentioning

confidence: 93%

“…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: 98%

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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Aluminium nitride in steel

Cited by 171 publications

References 74 publications

Plastic Deformation and Damage Behaviors of Fe-18Cr-18Mn-0.63N High-Nitrogen Austenitic Stainless Steel under Uniaxial Tension and Compression

Plastic Deformation and Damage Behaviors of Fe-18Cr-18Mn-0.63N High-Nitrogen Austenitic Stainless Steel under Uniaxial Tension and Compression

Microstructural Control in Aluminium-Killed Low C-Mn Boron Containing Steel for Improved Formability and Cold Reducing Properties

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

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