Generation Mechanism of TiN Inclusion for GCr15SiMn during Electroslag Remelting Process

Liu, Yang; Cheng, Guoguang; Li, Shijian; Zhao, Min; Guo, Feng

doi:10.2355/isijinternational.isijint-2015-253

Cited by 31 publications

(19 citation statements)

References 10 publications

(7 reference statements)

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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%

“…[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. 15) For example, Matsubara et al 16) studied the removal of Fe from a liquid Al alloy under a supergravity field during Al solidification and attributed the observed separation to supergravity-induced macro-segregation during solidification.…”

Section: Supergravity-induced Separation Of Oxide and Nitride Inclusimentioning

confidence: 99%

See 1 more Smart Citation

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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Section: Supergravity-induced Separation Of Oxide and Nitride Inclusimentioning

confidence: 99%

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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“…Controlling microstructures and second phase in steel plays an vital role in the quality of steel. Carbide (M 3 C, M 3 C 2 , M 7 C 3 , M = Fe, Cr, Mn) [1,2] and TiN inclusion [3,4] are common second phase in high carbon chromium steel. Due to the good wear resistance and solid solubility with alloy elements (Cr, Mn) [5,6], carbide can keep good mechanical properties of bearing steel during heat treatment [7,8].…”

Section: Introductionmentioning

confidence: 99%

Complex Precipitates of TiN-MCx in GCr15 Bearing Steel

Tian¹,

Wang²,

Yuan³

et al. 2019

Preprint

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Nitride and carbide are the second phases which play an important role in the performance of bearing steel, and their precipitation behavior is complicated. In this study, TiN-MCx precipitations in GCr15 bearing steels were obtained by non-aqueous electrolysis, and their precipitation mechanisms were studied. TiN is the effective heterogeneous nucleation site for Fe7C3 and Fe3C, therefore, MCx can precipitate on the surface of TiN easily, its chemistry component consists of M3C and M7C3 (M = Fe, Cr, Mn) and Cr3C2. TiN-MCx with high TiN volume fraction, TiN forms in early stage of solidification, and MCx precipitates on TiN surface after TiN engulfed by the solidification advancing front. TiN-MCx with low TiN volume fraction, TiN and MCx form in late stage of solidification, TiN can not grow sufficiently and is covered by a large number of precipitated MCx particles.

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“…The results determine that the inclusions of ESR ingot using multi-component fluoride containing slag are MgO-Al 2 O 3 inclusions, but Al 2 O 3 inclusions when binary fluoride containing slag is adopted. Yang et al studied the generation mechanism of TiN inclusion for GCr15SiMn during the ESR process [7]. The results show that TiN inclusion that is found in final ingot is regenerated during solidification of metal, not the one from consumable electrode.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation and Experimental Validation of Motion and Distribution of Nonmetallic Inclusions in Argon Protection Electroslag Remelting Process

Huang

Liu

et al. 2018

Metals

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A transient coupled mathematical model has been proposed to predict the motion and distribution of nonmetallic inclusions in the electroslag remelting process. The electromagnetic field, temperature distribution, flow pattern, solidification, and inclusion behavior were solved simultaneously. The Euler-Lagrange approach was used to describe the interaction between continuous phase and inclusions. The discrete phase model (DPM) was adopted to track the particles acted by a number of forces. An experiment under argon protection was implemented, and it agrees well with the simulation. The effect of inclusion diameter was also discussed. The experiment result shows that the typical inclusions in final ingot are Al 2 O 3 core surrounded by an outer sulfide layer and pure MnS inclusions. The total area of inclusions increases from center toward ingot surface, while the average equivalent diameter decreases. The simulated result indicates a denser distribution of inclusions locations at the region ranging from 0.7 to 0.9 radii. Few inclusions are entrapped near the mold due to the strong descending flow. Moreover, the inclusion amount increases with height. The total amounts of inclusions with diameter of 2 µm, 5 µm, and 10 µm in ingot are 2199, 1871, and 1704, respectively. The imposed buoyancy and floatation contribute to this phenomenon.

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Generation Mechanism of TiN Inclusion for GCr15SiMn during Electroslag Remelting Process

Cited by 31 publications

References 10 publications

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

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

Complex Precipitates of TiN-MCx in GCr15 Bearing Steel

Numerical Investigation and Experimental Validation of Motion and Distribution of Nonmetallic Inclusions in Argon Protection Electroslag Remelting Process

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