Manufacturing and Applications of High Nitrogen Steels

Stein, G.; Hucklenbroich, I.

doi:10.1081/amp-120027494

Cited by 96 publications

(53 citation statements)

References 2 publications

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“…5,6) However, the beneficial influence of nitrogen is usually limited by its low solubility in some steels, 3,4) which can result in serious nitrogen segregation and nitrogen pore defect during the melting and solidification of HNSs. Many thermodynamic studies 4,[7][8][9][10] suggested that increasing nitrogen partial pressure was able to enhance the solubility of nitrogen and effectively eliminate pore defects for a given HNS. Therefore, the pressurized metallurgy has been considered as a promising method to obtain melt with high nitrogen content and keep nitrogen dissolved during the solidification of HNSs.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4] As such, a series of typical HNSs have been developed recently, such as CRONIDUR 30, M340, P900N and P2000. 5,6) However, the beneficial influence of nitrogen is usually limited by its low solubility in some steels, 3,4) which can result in serious nitrogen segregation and nitrogen pore defect during the melting and solidification of HNSs. Many thermodynamic studies 4,[7][8][9][10] suggested that increasing nitrogen partial pressure was able to enhance the solubility of nitrogen and effectively eliminate pore defects for a given HNS.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the pressurized metallurgy has been considered as a promising method to obtain melt with high nitrogen content and keep nitrogen dissolved during the solidification of HNSs. 4) Until now, several kinds of pressurized metallurgy technologies have been developed to manufacture HNSs, including pressurized induction melting (PIM) and pressurized electroslag remelting (PESR) et al [11][12][13][14][15] Meanwhile, the pressure exhibits a significant impact on casting solidification and structure formation. [15][16][17] The effect of the pressurization includes (a) increasing the solidification nucleation rate, (b) reducing the critical nucleus radius, (c) accelerating the cooling rate, 18,19) (d) refining macro/micro-structure, 16,20) and (e) eliminating solidification defects (shrinkage, porosity and pore, et al).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of Solidification Pressure on Interfacial Heat Transfer and Solidification Structure of 19Cr14Mn0.9N High Nitrogen Steel

Zhu

Wang

et al. 2018

ISIJ Int.

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The effect of solidification pressure (0.5, 0.85 and 1.2 MPa) on heat transfer between ingot and mould was investigated with the measurement of cooling curves and calculation of heat transfer coefficient. Combined with cooling rate, temperature gradient and local solidification time (LST), the influence of pressure on solidification structure of 19Cr14Mn0.9N was revealed by macrostructure observation. The calculation results of heat transfer coefficient, obtained by the Beck-Nonlinear estimation technique, indicate that increasing solidification pressure obviously enhances heat transfer at the ingot/mould interface. And higher solidification pressure is benefit to increase cooling rate and temperature gradient of ingot. Meanwhile, increasing solidification pressure considerably suppresses nitrogen gas pore, and reduces the whole area of dispersing porosity and shrinkage, which is favorable to obtain a sound ingot. With the solidification pressure increasing from 0.5 to 1.2 MPa, the columnar zone is lengthened, the columnar-toequiaxed transition (CET) position gradually moves to the ingot center, and both dendritic arm spacing (λ 1 and λ 2 ) and local solidification time (LST) gradually decrease. The solidification structure is significantly refined and compressed under higher solidification pressure.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Solidification Pressure on Interfacial Heat Transfer and Solidification Structure of 19Cr14Mn0.9N High Nitrogen Steel

Zhu

Wang

et al. 2018

ISIJ Int.

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“…As a result of the combined treatment, high nitrogen steels can form structures that are insuf ficiently described in literature or belong to other alloying systems [9]. At the same time, the regularities [10,11]. The initial treatment (IT) was hot plastic deformation by rolling at 1220-1200°C followed by recrystallization annealing at 1150°C for 1 h and water quenching.…”

Section: Introductionmentioning

confidence: 99%

Influence of deformation on the structure and mechanical and corrosion properties of high-nitrogen austenitic 07Kh16AG13M3 steel

et al. 2013

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Abstract-The correlation has been studied between the structure of a high nitrogen austenitic Cr-Mn-N steel formed in the process of combined hardening treatment, including cold plastic deformation (CPD), and its mechanical and corrosion properties. The structure and properties of commercial high nitrogen (0.8% N) 07Kh16AG13M3 steel is analyzed after rolling by CPD and aging at 500 and 800°C. It is shown that CPD of the steel occurs by dislocation slip and deformation twinning. Deformation twinning and also high resistance of austenite to martensitic transformations at true strains of 0.2 and 0.4 determine the high plasticity of the steel. The contribution of the structure imperfection parameters to the broadening of the austenite lines dur ing CPD is estimated by X ray diffraction. The main hardening factor is stated to be lattice microdistortions. Transmission electron microscopy study shows that heating of the deformed steel to 500°C leads to the for mation of the intermediate CrN phase by a homogeneous mechanism, and the intermtallic χ phase forms along the austenite grain boundaries in the case of heating at 800°C. After hardening by all investigated tech nological schemes, exception for aging at 800°C, the steel does not undergo pitting corrosion and is slightly prone to a stress corrosion cracking during static bending tests, while aging at 800°C causes pitting corrosion at a pitting formation potential E pf = -0.25 V.

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Inert Gas Atomization of High‐Nitrogen TRIP‐Steels

Korobeinikov¹,

Perminov²,

Heller³

et al. 2018

Adv Eng Mater

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High nitrogen steels with transformation induced plasticity (TRIP) effect have been recently developed within the framework of the project CRC799. These steels are utilized in a form of powder for the needs of this project. Therefore, the current study focuses on the powder production of high nitrogen steels via inert gas atomization process. Specifically, the role of nitrogen content in determination of the basic powder properties and its behavior on the atomization process are investigated. Additionally, the effects of several other process parameters, such as temperature of the melt and gas to metal ratio are discussed. Thereby, the effect of nitrogen content on the median particle size is not confirmed. Meanwhile, an increase in the spraying temperature and a rise in gas to metal ratio lead to a slight decrease in the median particle size. Nitrogen content in the powder is technologically controlled by the atmosphere above the melt before the spraying process. At last, nitrogen shows a significant impact on the phase composition of powder, by stabilizing the austenite phase. The results thus obtained are of high interest for the future application of the designed steels in the powder form.

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Manufacturing and Applications of High Nitrogen Steels

Cited by 96 publications

References 2 publications

Effect of Solidification Pressure on Interfacial Heat Transfer and Solidification Structure of 19Cr14Mn0.9N High Nitrogen Steel

Effect of Solidification Pressure on Interfacial Heat Transfer and Solidification Structure of 19Cr14Mn0.9N High Nitrogen Steel

Influence of deformation on the structure and mechanical and corrosion properties of high-nitrogen austenitic 07Kh16AG13M3 steel

Inert Gas Atomization of High‐Nitrogen TRIP‐Steels

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