Thermodynamic Interaction between Chromium and Aluminum in Liquid Fe–Cr Alloys Containing 26 mass% Cr

Jo, Jong-Oh; Jung, Moon-Sic; Park, Jong‐Hyun; Lee, Chang-Oh; Pak, Jong‐Jin

doi:10.2355/isijinternational.51.208

Cited by 17 publications

(8 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the systems containing N, the N solubility and solubility product of TiN and AlN have been measured in Fe–Cr–Ti–Al–N melt over a wide range of melt composition and temperature. [ 9–11 ] The simultaneous effects of two different alloying elements on the N solubility were determined from the experimental results, and the reproducibility of the N content was improved in the multicomponent system by considering the cross‐product effect. [ 9 ] Meanwhile, for the O containing systems, the deoxidation equilibria in Fe–Cr–Ti–Al–O melt have been measured to determine the thermodynamic relation between alloying elements and O in liquid iron.…”

Section: Introductionmentioning

confidence: 99%

“…Thermodynamic parameters selected from the authors’ recent studies [ 9–14,24,25 ] and previous reports [ 26–30 ] are listed in Table 1 for the multicomponent Fe–Cr–Ti–Al–N–O system. The present study carried out the verification experiments in the Fe–Cr–Ti–Al–N and Fe–Cr–Ti–Al–O systems, respectively, for checking the validity and compatibility of the parameters.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Formation of Nitride and Oxide Inclusions in Liquid Fe‐Cr‐Ti‐Al Alloys

Paek

Lindberg

Pak

2020

steel research int.

Self Cite

View full text Add to dashboard Cite

Thermodynamics of nitride and oxide inclusion formations in liquid Fe–Cr alloys containing Ti and Al is studied to provide accurate information for the refining process of ferritic stainless steel. The compatible set of the interaction parameters for the multicomponent Fe–Cr–Ti–Al–N–O system is tabulated based on Wagner's formalism. The selected parameters are valid to reproduce the thermodynamic behavior of N and O in both Fe–Cr–Ti–Al–N and Fe–Cr–Ti–Al–O systems. The verification experiments of the N solubilities and nitride solubility products in Fe–Cr–Ti–N, Fe–Cr–Al–N, and Fe–Cr–Ti–Al–N melts are in good agreement with the present calculations over the wide range of melt composition and temperature. The various types of Ti nitride inclusions are observed in Fe–Cr–Ti–Al–N melt during cooling. The inclusion evolution experiment is also carried out to confirm the morphology and composition change of oxide inclusions by the Al–Ti complex deoxidation in liquid Fe–Cr alloy. The relation between the melt composition and the stability of oxide inclusion is thermodynamically described by constructing of the equilibrium predominance diagram in the Fe–Cr–Ti–Al–O system.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Formation of Nitride and Oxide Inclusions in Liquid Fe‐Cr‐Ti‐Al Alloys

Paek

Lindberg

Pak

2020

steel research int.

Self Cite

View full text Add to dashboard Cite

show abstract

“…A study conducted by Lee et al [21] revealed that the deoxidizing power of aluminum in high-alloy melts becomes weaker than that in pure iron. Moreover, various equilibration methods including Sievert's method [22] and the sampling method described in [15], combined with various measurement techniques such as the galvanic cell technique [23] and the metal-nitride-gas equilibration technique [24], have been adopted to determine the thermodynamic interactions of chromium with aluminum [25][26][27], titanium [24,28,29], oxygen [30], and nitrogen [28,31] with varying Cr concentrations.…”

Section: Introductionmentioning

confidence: 99%

Transient Evolution of Inclusions during Al and Ti Additions in Fe-20 Mass pct Cr Alloy

Bai¹,

Sun²,

Zhang³

2019

Metals

View full text Add to dashboard Cite

The transient evolution of inclusions during Al and Ti additions in a Fe-20 mass pct Cr alloy was investigated using polished cross sections and electrolytic extraction. After Al addition, the evolution of Al2O3-based inclusions based upon the area and particle size passed through the following three main stages with time: Particle agglomeration, inclusion floating, and a slow decrease of the remaining Al2O3-based inclusions. Titanium wire was fed into the steel at the end of the floating stage after Al addition when the Ostwald ripening process was finished. Immediately after Ti addition, the transient phase of Ti oxide was readily generated on the existing Al2O3-based inclusion and disappeared due to Al reduction as time progressed. The formation of the transient TiOx phase was affected by the low disregistry between Al2O3 and TiOx and the local Ti supersaturation, which cannot be predicted by the equilibrium relations of Ti–O–N or Ti–Al–O in the high-Cr-containing melt. Because of the local supersaturation of dissolved [%Ti] and [%N] shortly after Ti addition, TiN associated with existing inclusions and three types of individual TiN including single cubes, twinned inclusions, and clusters were identified. In order to minimize the Ti loss caused by the formation of Ti-rich zones during the transient stages, the removal of large Al2O3-based particles including aggregates, clusters, and flower-shaped inclusions should be promoted by stirring before Ti addition. After Ti addition, Brownian and turbulent were the major factors affecting the collision of particles smaller than the threshold of 2.7 μm. The agglomeration of inclusions larger than this threshold was mainly dominated by turbulent and Stokes’ collisions.

show abstract

“…Table 2. First and second order interaction parameters for the calculation of Al-N equilibrium in FeCrAl alloy at 1873 K [36]. During solidification, the growth rate of AlN may be controlled by the chemical reaction rate at the AlN/steel interface, the mass transport rate of aluminum from steel to the interface, or the mass transport rate of nitrogen from the steel to the interface [37].…”

Section: Precipitation Of Alnmentioning

confidence: 99%

Effect of Cooling Rate on AlN Precipitation in FeCrAl Stainless Steel During Solidification

Deng

Liu

et al. 2019

Metals

View full text Add to dashboard Cite

The effect of cooling rate on the evolution of AlN inclusions precipitated during solidification in FeCrAl stainless steel was investigated using an experimental study and thermodynamic and kinetic calculations. The number and size of AlN inclusions precipitated under different cooling rates were examined with the feature function of the field-emission scanning electron microscope. A model combining micro-segregation and the diffusion-controlled growth model was set up to determine the mechanism of AlN particle growth. The results showed that AlN precipitates in the mushy zone. The size of AlN particles decreases and the number of AlN particles increases with increasing cooling rate, whereas the volume fraction is essentially unchanged. The AlN particles grow during solidification after the content of solutes in molten steel has exceeded the concentration in equilibrium with AlN. The nitrogen content varies significantly with the cooling rate during solidification. Increasing the cooling rate and reducing the nitrogen content in the molten steel can reduce the AlN particle size in FeCrAl alloys as the growth time decreases.

show abstract

Thermodynamic Interaction between Chromium and Aluminum in Liquid Fe–Cr Alloys Containing 26 mass% Cr

Cited by 17 publications

References 10 publications

Formation of Nitride and Oxide Inclusions in Liquid Fe‐Cr‐Ti‐Al Alloys

Formation of Nitride and Oxide Inclusions in Liquid Fe‐Cr‐Ti‐Al Alloys

Transient Evolution of Inclusions during Al and Ti Additions in Fe-20 Mass pct Cr Alloy

Effect of Cooling Rate on AlN Precipitation in FeCrAl Stainless Steel During Solidification

Contact Info

Product

Resources

About