On the Solubility of Nitrogen in Liquid Iron and Steel Alloys Using Elevated Pressure / Über die Löslichkeit von Stickstoff in Eisen- und Stahllegierungen unter erhöhtem Druck

Satir-Kolorz, A.; Feichtinger, Heinrich

doi:10.1515/ijmr-1991-820904

Cited by 26 publications

(20 citation statements)

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“…The dissolution reaction of nitrogen in metal melt is generally expressed as: Under the experimental conditions of this study, the fugacity is equal to the nitrogen pressure. 17,19,21) The equilibrium constant K N of the nitrogen dissolution reaction can be described as:…”

Section: Nitrogen Solubility Under Nitrogen Pressurementioning

confidence: 99%

“…4(b) to 4(d), the nitrogen solubility of Fe-Cr, Fe-Mn, Fe-Cr-Ni and Fe-Cr-Mn alloy melts under high nitrogen pressure also has a negative deviation from Sieverts' law. 19) To modify the deviation of nitrogen solubility that brought by high nitrogen pressure, considering that K N is a constant and P P N2 0 / is the experimental condition in Eq. (3), the activity coefficient f N is what needs to be modified.…”

Section: Nitrogen Solubility Under Nitrogen Pressurementioning

confidence: 99%

“…15) At present, only a few studies have explained or corrected the deviation. [16][17][18][19][20][21] Rawers et al 17) investigated the nitrogen solubility of Fe-Cr and Fe-Cr-Ni alloy melts under high nitrogen pressure, and developed a new term to describe the combined effect of pressure and alloy composition on nitrogen solubility. However, the parameter of pressure-composition effect term [% ]ln X P N2 that applied for model modification varied with the alloy system.…”

Section: Introductionmentioning

confidence: 99%

“…However, the parameter of pressure-composition effect term [% ]ln X P N2 that applied for model modification varied with the alloy system. Satir-Kolorz and Feichtinger 19) conducted researches regarding the nitrogen solubility of Fe-Cr, Fe-Mn, Fe-Mo and other alloy systems under the nitrogen pressure up to 10 MPa.…”

Section: Introductionmentioning

confidence: 99%

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Nitrogen Solubility and Gas Nitriding Kinetics in Fe–Cr–Mo–C Alloy Melts under Pressurized Atmosphere

Feng

et al. 2022

ISIJ Int.

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The precise control of nitrogen content in high nitrogen martensitic stainless steel is the guarantee of its excellent performance, and is a crucial issue for its manufacturing process using pressurized gas nitriding. In this paper, the effects of nitrogen pressure, temperature and alloy composition on nitrogen solubility and pressurized gas nitriding kinetics of Fe-Cr-Mo-C alloy melts were investigated. In order to correct the deviation of nitrogen solubility from Sieverts' law under high nitrogen pressure, the first-and secondorder interaction parameters of nitrogen on itself were obtained; accordingly, the nitrogen solubility model under pressure was established and well verified. The nitrogen solubility decreased with increasing temperature and C content, and increased with increasing Cr and Mo contents. The nitrogen mass transfer in liquid phase was the nitriding rate-determining step under different nitrogen pressures. The apparent mass transfer coefficient of nitrogen was approximately 0.0218 to 0.0230 cm•s − 1 , and showed a weak dependence with pressure. The apparent mass transfer coefficient of nitrogen increased significantly with the increase of temperature and electromagnetic stirring, and was rarely affected by the content of Cr, Mo and C. Considering the influence of pressure change on nitriding rate in pressurization stage, a novel kinetic model for gas nitriding under high pressure was established and exhibited effectiveness in practice. KEY WORDS: high nitrogen martensitic stainless steel; pressurized atmosphere; nitrogen solubility; gas nitriding kinetics; mass transfer coefficient of nitrogen.

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Section: Nitrogen Solubility Under Nitrogen Pressurementioning

confidence: 99%

Section: Nitrogen Solubility Under Nitrogen Pressurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Nitrogen Solubility and Gas Nitriding Kinetics in Fe–Cr–Mo–C Alloy Melts under Pressurized Atmosphere

Feng

et al. 2022

ISIJ Int.

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“…where [N] is the solubility of the nitrogen gas in metal melt at a given partial pressure of gas p N 2 ; K N is the solubility constant (Sievert's constant), which depends on temperature and the way concentration and pressure are expressed. Figure 2 presents the effect of nitrogen partial pressure on the nitrogen content in a liquid pure iron at 1600 • C [60]. It is seen that the solubility of nitrogen in pure Fe is approximately 0.044 wt.…”

Section: Vacuum Induction Melting Of Steelsmentioning

confidence: 99%

9–12% Cr Heat-Resistant Martensitic Steels with Increased Boron and Decreased Nitrogen Contents

Dudova

2022

Metals

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As a promising alloying approach, the modification of chemical composition by increasing the B content and decreasing the N content has been applied to improve the creep resistance of various 9–12% Cr heat-resistant martensitic steels. This paper presents an overview of the creep strength and related microstructural features of the 9% Cr and 10–12% Cr martensitic steels with high B and low N contents. The factors that determine the optimal B/N ratio in steels are considered. The creep properties are compared with those for similar steels with conventional B and N contents. The relationships between the stability of lath structure and precipitates of M23C6, Laves, and MX phases and the creep strength of steels are considered. Further perspectives of this modification of alloying by high boron and low nitrogen are outlined.

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Thermodynamics of Nitrogen in Molten Fe–Cr–Mn–C–N Alloys

You

Ran

Jiang

et al. 2022

steel research int.

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Thermodynamic behavior of N in the Fe–Cr–Mn–C–N liquid solution is modeled using the Modified Quasichemical Model with consideration of the short‐range ordering. A set of new model parameters for the Fe–Cr–Mn–C–N liquid solution are determined based on a critical evaluation of the available experimental data. The solubility of N in the entire composition range of all binary, ternary, and multicomponent molten alloys within the Fe–Cr–Mn–C–N system is well optimized for various temperatures and N2 pressures. Besides, thermodynamic properties of N in Fe‐based liquid solution affected by the alloying elements are calculated from the developed thermodynamic database. As an application of the database, the N solubility in different steel melts of various conditions is predicted for the process optimization.

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On the Solubility of Nitrogen in Liquid Iron and Steel Alloys Using Elevated Pressure / Über die Löslichkeit von Stickstoff in Eisen- und Stahllegierungen unter erhöhtem Druck

Abstract: Bd. 't'(Q (1991) H. 9Solubility of N in Fe an d Steel Alloy

Cited by 26 publications

References 0 publications

Nitrogen Solubility and Gas Nitriding Kinetics in Fe–Cr–Mo–C Alloy Melts under Pressurized Atmosphere

Nitrogen Solubility and Gas Nitriding Kinetics in Fe–Cr–Mo–C Alloy Melts under Pressurized Atmosphere

9–12% Cr Heat-Resistant Martensitic Steels with Increased Boron and Decreased Nitrogen Contents

Thermodynamics of Nitrogen in Molten Fe–Cr–Mn–C–N Alloys

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