Phase evolution and mechanical properties of non-equiatomic Fe–Mn–Ni–Cr–Al–Si–C high entropy steel

Jain, Harsh; Shadangi, Yagnesh; Shivam, Vikas; Chakravarty, Dibyendu; Mukhopadhyay, N. K.; Kumar, Devendra

doi:10.1016/j.jallcom.2020.155013

Cited by 36 publications

(9 citation statements)

References 41 publications

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“…Recently the concept of low density/high-entropy steels have emerged to improve the steel material properties through high alloy additions to Fe to improve steel tensile strength and ductility at the same time, as in the case for high-entropy alloys (HEAs) [22]. Aluminum is used to lower steel density and also to induce the high entropy-effect in these steel formulations initially focused on the Fe-C-Mn-Al-Si chemical system [23]. Similarly, lightweight stainless steels are formulated by adding about 10% Al to Fe-Mn-Cr formulations [24].…”

Section: Introductionmentioning

confidence: 99%

Chemical Interaction of Cr-Al-Cu Metal Powders in Aluminum-Assisted Transfer of Chromium in Submerged Arc Welding of Carbon Steel

Coetsee

Bruin

2022

Processes

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In submerged arc welding (SAW) of chromium containing steels, the chromium in the weld metal is usually sourced from weld wire. Manufacturing of precise weld wire compositions for alloying of the weld metal is expensive. In addition, alloying of weld metal with high levels of copper via weld wire is hindered by work hardening of the weld wire. In the SAW process, a large quantity of oxygen is added to the weld pool. Because chromium has a high affinity for oxygen, the oxygen partial pressure at the weld pool-molten flux interface must be controlled to ensure high recovery of chromium to the weld metal. This study illustrates the application of copper as stabilizer, in conjunction with aluminum, to enhance chromium transfer to the weld pool. The stabilizer effect occurs because the Cr-Al-Cu alloy liquidus temperatures are much lower than the pure Cr liquidus temperature. The result is an increase in the total quantity of Cr, Al, and Cu powder melted into the weld pool. The application of Al powder additions to control the partial oxygen pressure at the molten flux-weld pool interface is confirmed in the presence of Cr and Cu metal powders to ensure the weld metal ppm O content is maintained at the acceptable level of 300 ppm.

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Section: Introductionmentioning

confidence: 99%

Chemical Interaction of Cr-Al-Cu Metal Powders in Aluminum-Assisted Transfer of Chromium in Submerged Arc Welding of Carbon Steel

Coetsee

Bruin

2022

Processes

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“…For example, the addition of Al via weld wire is unlikely to be a workable method due to the high affinity of Al for oxygen. Aluminium is an important alloying element specifically used in low density/high-entropy steels for its lower density and low mixing enthalpy with most other alloying elements [24,25]. Although low density/high-entropy steel development is in its infancy and is centred on Fe-C-Mn-Al-Si steel formulations, different alloying additions are under investigation [24,25].…”

Section: Introductionmentioning

confidence: 99%

Aluminium-Assisted Alloying of Carbon Steel in Submerged Arc Welding: Application of Al-Cr-Ti-Cu Unconstrained Metal Powders

Coetsee

Bruin

2022

Processes

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Al assisted alloying of carbon steel in Submerged Arc Welding (SAW) by Al-Cr-Ti-Cu unconstrained metal powders is applied. A base case without metal powder additions is compared to two metal powder addition schedules, Al-Cu-Ti and Al-Cu-Ti-Cr. Al powder is used as a deoxidiser element to control the oxygen partial pressure at the weld pool–molten flux interface to ensure that most of the Ti and Cr metal powder is transferred into the weld pool and that the weld metal ppm O is controlled within acceptable limits of 200 to 500 ppm O. The likely sequence of alloy melt formation is deduced from the relevant alloy phase diagrams. The effect of Fe addition into the initial Al-Cu-Ti and Al-Cu-Ti-Cr alloy melt is illustrated in thermochemical calculations. Increased metal deposition productivity with metal powder addition in SAW is confirmed. The metal deposition rates increased by 19% and 40% when Al-Cu-Ti and Al-Cu-Ti-Cr powders were applied at the same weld heat input used in the absence of metal powder additions.

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“…While the peaks at 28.1°, 34.6°, 45.1° and 49.7° are consistent with (110), (111), (210) and (211) lattice planes of FeSi phase (JCPDS No. , respectively [29][30][31]. With the extension of the ball-milling time, a part of the Al elements may dissolve into the FeSi phase, inducing a broader peak.…”

Section: Resultsmentioning

confidence: 99%

“…After ball-milling for a different time, the samples present strong diffraction peaks at 38. [29][30][31]. With the extension of the ball-milling time, a part of the Al elements may dissolve into the FeSi phase, inducing a broader peak.…”

Section: Resultsmentioning

confidence: 99%

Porous Si/Fe2O3 Dual Network Anode for Lithium–Ion Battery Application

et al. 2020

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Benefiting from ultra-high theoretical capacity, silicon (Si) is popular for use in energy storage fields as a Li–ion battery anode material because of its high-performance. However, a serious volume variation happens towards Si anodes in the lithiation/delithiation process, triggering the pulverization of Si and a fast decay in its capacity, which greatly limits its commercial application. In our study, a porous Si/Fe2O3 dual network anode was fabricated using the melt-spinning, ball-milling and dealloying method. The anode material shows good electrochemical performance, delivering a reversible capacity of 697.2 mAh g−1 at 200 mA g−1 after 100 cycles. The high Li storage property is ascribed to the rich mesoporous distribution of the dual network structure, which may adapt the volume variation of the material during the lithiation/delithiation process, shorten the Li–ion diffusion distance and improve the electron transport speed. This study offers a new idea for developing natural ferrosilicon ores into the porous Si-based materials and may prompt the development of natural ores in energy storage fields.

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Phase evolution and mechanical properties of non-equiatomic Fe–Mn–Ni–Cr–Al–Si–C high entropy steel

Cited by 36 publications

References 41 publications

Chemical Interaction of Cr-Al-Cu Metal Powders in Aluminum-Assisted Transfer of Chromium in Submerged Arc Welding of Carbon Steel

Chemical Interaction of Cr-Al-Cu Metal Powders in Aluminum-Assisted Transfer of Chromium in Submerged Arc Welding of Carbon Steel

Aluminium-Assisted Alloying of Carbon Steel in Submerged Arc Welding: Application of Al-Cr-Ti-Cu Unconstrained Metal Powders

Porous Si/Fe2O3 Dual Network Anode for Lithium–Ion Battery Application

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