Melting of High Nitrogen Steels

Feichtinger, Heinrich; Stein, G.

doi:10.4028/www.scientific.net/msf.318-320.261

Cited by 43 publications

(29 citation statements)

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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%

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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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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%

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 difficulty of producing High Nitrogen Steels (HNS) is due to the thermodynamic limit of the solubility of nitrogen in a liquid or solid state [6,7]. Nitrogen solubility in austenite does not exceed 0.4 wt % [2,8], and in the temperature range between 700 • C and 1000 • C [9,10], the discontinuous precipitation of chromium nitrides occurs, according to the reaction: γ → γ* + Cr 2 N.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Relaxation Processes in HNS Due to Interstitial-Substitutional Pairs

Fava¹,

Montanari²,

Richetta³

et al. 2017

Metals

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Mechanical Spectroscopy (MS) tests have been performed on a high nitrogen (0.8 wt %) austenitic steel (HNS) with resonance frequencies in the range of kHz. Two sets of samples have been examined: the first set in an as-prepared condition, the second one submitted to a heat treatment of 2 h at 800 • C, which induces a discontinuous precipitation of Cr 2 N phase. In both sets, the damping spectrum shows a broad peak whose position and shape is changed by the precipitation of Cr 2 N phase. The results are explained by considering interstitial-substitutional (i-s) interactions.

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“…This problem during solidification has long been a major obstacle in the manufacturing of high nitrogen steel (HNS). To overcome the "solubility gap problem, " the nitrogen content of molten iron alloys can be increased beyond the solubility limit at atmospheric pressure by raising the nitrogen partial pressure, that is, melting under pressure using one of the following techniques: pressurized electroslag remelting furnaces (PESR), pressurized induction furnaces (counter pressure casting), plasma arc remelting furnaces (PAR), or arc slag remelting furnaces (ASR) [9][10][11][12][13][14][15][16][17][18]. The first two are routinely used among HNS producers worldwide, whereas the last two have found limited applications.…”

Section: Introduction and Theoretical Aspectsmentioning

confidence: 99%

Influence of Vanadium and Cast Temperature on Nitrogen Solubility of Stainless Steel

Ghali

2014

Journal of Metallurgy

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Three stainless steel grades with different vanadium content were produced in open induction furnace. The base chemical composition of investigated stainless steel has contained 18.48-18.75% Cr, 5.17-5.62% Mn, 2.47-2.58% Mo, and 6.39-6.64% Ni. The vanadium contents of the three stainless steel grades were 0.009%, 0.112%, and 0.189%. The proposed stainless steels were casted at temperatures 1753 K and 1833 K. The nitrogen contents were determined for the produced steel grades at every cast temperature. The determined nitrogen contents were compared with those calculated from the developed equation of Grigorenko and Pomarin. The influence of cast temperature and vanadium content on nitrogen solubility was investigated. Interpretation between experimental and calculated nitrogen content was carried out. Increasing vanadium content and decreasing cast temperature were found to have positive significant effect on the nitrogen solubility. There were great deviations between experimental results and those calculated by Grigorenko and Pomarin equation.

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Melting of High Nitrogen Steels

Cited by 43 publications

References 0 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

Analysis of Relaxation Processes in HNS Due to Interstitial-Substitutional Pairs

Influence of Vanadium and Cast Temperature on Nitrogen Solubility of Stainless Steel

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