Investigation on the formation mechanism of Ti-bearing non-metallic inclusions in Fe-Al-Ti-O-N alloy by inductive separation method

Li, Minggang; Matsuura, Hiroyuki; Tsukihashi, Fumitaka

doi:10.1016/j.matchar.2017.12.033

Cited by 17 publications

(4 citation statements)

References 23 publications

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“…In addition, both TiN and TiC have a NaCl-type structure with a small difference in the ambiguity constants (a TiN = 0.4241 nm, a TiC = 0.4329 nm). During the process of solidification, the TiN and TiC tend to form TiC–TiN composite inclusions without exhibiting distinct nucleation centers [23]. Ti(l)+[N]=TiN(s) Ti(l)+C(s)=TiC(s)…”

Section: Resultsmentioning

confidence: 99%

Effect of Turning Amount on Metallurgical Qualities and Mechanical Properties of GH4169 Superalloy

Yang

Chen

et al. 2019

Materials

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The determination of an appropriate amount of turning for superalloy ingot surfaces, in a scientific and reasonable manner, is vital to the improvement of the metallurgical quality and comprehensive performance of superalloy ingots. In the present study, scanning electron microscopy with energy-dispersive spectroscopy, a high-temperature testing machine, a Brinell hardness tester and the Image-Pro Plus software were used to analyze and compare the types and amounts of inclusions, the average area of the (Al,Mg)O inclusions, and the mechanical properties of points at different distances from the edge of the GH4169 superalloy vacuum arc remelting (VAR) ingot edge. The effects of the amount of turning to which the superalloy is subjected, the metallurgical qualities, and the mechanical properties were systematically studied. The results showed that the five inclusion types did not change as the sampling locations moved away from the ingot edge, but the amount of inclusions and the average area of the (Al,Mg)O inclusions first decreased and then stabilized. Similarly, the tensile strength, elongation, section shrinkage, hardness, and fatigue life first increased and then stabilized. Finally, this experiment tentatively determined that an appropriate amount of turning for a GH4169 superalloy ingot is 36–48 mm.

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Section: Resultsmentioning

confidence: 99%

Effect of Turning Amount on Metallurgical Qualities and Mechanical Properties of GH4169 Superalloy

Yang

Chen

et al. 2019

Materials

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“…It is found that the dissolution of these inclusions has hardly effect on the removal process. [11][12][13] Therefore, the development of a novel, green, low-cost, and highly efficient method of superalloy purification is a task of high practical significance. 14) Recently, density differences between impurities and the melt have been used as the basis for supergravity-based large-scale purification of metals.…”

Section: Supergravity-induced Separation Of Oxide and Nitride Inclusimentioning

confidence: 99%

Supergravity-Induced Separation of Oxide and Nitride Inclusions from Inconel 718 Superalloy Melt

et al. 2020

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Herein, a method of supergravity-enhanced separation was used to remove oxide and nitride inclusions from Inconel 718 superalloy melt, with elucidating the inclusion removal behavior by varying the gravity coefficients (G) and separation times (t) used for melt treatment. Under supergravity conditions, inclusions concentrated at the sample top and are almost absent at the sample bottom. Moreover, the inclusion number density and average size showed a gradient distribution along the supergravity direction, and the steepness of this gradient rapidly increased with increasing G and t. The experimentally determined inclusion movement velocities agreed well with those calculated using Stokes's law at G ≤ 210 and t ≤ 10 min. At G = 210 and t = 10 min, the total oxygen and nitrogen contents of the sample decreased from 34.4 to 8.7 ppm and 133.4 to 34.1 ppm, respectively, corresponding to oxide and nitride removal efficiencies of 74.7% and 74.4%, respectively.

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“…These mechanisms are related to chemistry and thermodynamics of the system. Most studies were made by postmortem analysis of inclusions or clog [13][14][15]30,[39][40][41][42][43] or through thermodynamic calculation of the involved phases (materials) related to clogging. [41,[44][45][46][47] These studies indicated that the clogging event was related to (or affected by) the thermodynamic or chemical properties of the involved materials, but no quantitative correlation between the clogging event and those thermodynamic or chemical properties was established.…”

Section: Model Limitations and Outlookmentioning

confidence: 99%

Calculation Accuracy and Efficiency of a Transient Model for Submerged Entry Nozzle Clogging

Barati

Kharicha

et al. 2019

Metall Mater Trans B

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A transient numerical model was proposed and validated by the current authors for nozzle clogging (Barati et al. in Powder Technol 329:181-98, 2018). The model can reproduce the experiment in pilot scale satisfactorily. In the present article, the main objective is to validate the model for application in industry process continuous casting of steel, referring to the model accuracy and calculation efficiency. The results have shown that for the complex geometry of submerged entry nozzle (SEN), where it is difficult to create hexahedron mesh in the entire domain, a mixed mesh type is recommended, i.e., the wedge mesh for regions adjacent to SEN walls and the tetrahedron mesh for inner regions. Another challenge to the calculation of real SEN clogging is the huge number of particles involved in the industry process. An artificial factor, the N-factor, has to be introduced to reduce the calculation cost. A dimensionless number (a) is defined to limit the N-factor and ensure the modeling accuracy. Simulation of a test case has indicated that by an appropriate N-factor (1000, corresponding to a = 6 9 10 À5), the calculation time would be reduced significantly to a reasonable time.

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Investigation on the formation mechanism of Ti-bearing non-metallic inclusions in Fe-Al-Ti-O-N alloy by inductive separation method

Cited by 17 publications

References 23 publications

Effect of Turning Amount on Metallurgical Qualities and Mechanical Properties of GH4169 Superalloy

Effect of Turning Amount on Metallurgical Qualities and Mechanical Properties of GH4169 Superalloy

Supergravity-Induced Separation of Oxide and Nitride Inclusions from Inconel 718 Superalloy Melt

Calculation Accuracy and Efficiency of a Transient Model for Submerged Entry Nozzle Clogging

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