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Metals
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Strip Casting of Metals and Alloys
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Strip Casting of Metals and Alloys

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Metal Casting, Forming and Heat Treatment".

Deadline for manuscript submissions: closed (26 February 2021) | Viewed by 13205

Special Issue Editor

Prof. Dr. Nikki Stanford

E-Mail Website
Guest Editor
Future Industries Institute, University of South Australia, Building MM, Mawson Lakes Campus, Mawson Lakes, SA 5095, Australia
Interests: alloy design; plasticity, texture, phase transformations, characterisation and microscopy; light alloys; strip casting

Special Issue Information

Dear Colleagues,

Strip casting, and its associated variants, are of significant interest for the metallurgical community. In the ferrous alloy system, the energy savings associated with direct strip casting along with the large tonnages of strip produced every year make this technology of great global interest. Although some work on the heat transfer and substrate wettability during steel strip casting has been completed, there are an increasing number of studies showing how unusually steel alloys behave after strip casting. Examples include unusual texture development of stainless steels, the formation of nanoscale precipitates, delayed recrystallisation in both austenitic and ferritic alloys, delayed phase transformation on cooling, and development of very large compositional gradients resulting from solute segregation during solidification. These unusual microstructural observations make the study of ferrous strip casting of great relevance to the metallurgical community, and papers relating to this topic are invited.

Nonferrous strip casting has also received a significant amount of research attention; aluminium strip casting is a commercialized technology, and magnesium strip casting shows properties different to those cast by conventional methods. For the case of magnesium in particular, the texture has been found to be modified by strip casting, leading to a significant change in mechanical properties. Again, there is some interesting metallurgy currently being discovered in this field. Submissions on topics related to the solidification, texture, microstructure and properties of strip cast metals and alloys are invited to this issue. Articles on associated casting technologies, such as thin slab casting, splat quenching, Hazelett casting, and twin belt casting, are also welcomed.

Prof. Nikki Stanford
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Metals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Direct strip casting
  • Thin slab casting
  • Rapid solidification
  • Twin belt casting
  • Twin roll strip casting

Published Papers (4 papers)

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Research

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12 pages, 5313 KiB  
Article
The Effect of Molybdenum on Precipitation Behaviour in Austenite of Strip-Cast Steels Containing Niobium
by Lu Jiang, Ross K. W. Marceau, Thomas Dorin, Huaying Yin, Xinjun Sun, Peter D. Hodgson and Nicole Stanford
Metals 2020, 10(10), 1330; https://doi.org/10.3390/met10101330 - 5 Oct 2020
Cited by 3 | Viewed by 2259
Abstract
Two low-C steels microalloyed with niobium (Nb) were fabricated by simulated strip casting, one with molybdenum (Mo) and the other without Mo. Both steels were heat treated to simulate coiling at 900 °C to investigate the effect of Mo on the precipitation behaviour [...] Read more.
Two low-C steels microalloyed with niobium (Nb) were fabricated by simulated strip casting, one with molybdenum (Mo) and the other without Mo. Both steels were heat treated to simulate coiling at 900 °C to investigate the effect of Mo on the precipitation behaviour in austenite in low-C strip-cast Nb steels. The mechanical properties results show that during the isothermal holding at 900 °C the hardness of both steels increases and reaches a peak after 3000 s and then decreased after 10,000 s. Additionally, the hardness of the Mo-containing steel is higher than that of the Mo-free steel in all heat-treated conditions. Thermo-Calc predictions suggest that MC-type carbides exist in equilibrium at 900 °C, which are confirmed by transmission electron microscopy (TEM). TEM examination shows that precipitates are formed after 1000 s of isothermal holding in both steels and the size of the particles is refined by the addition of Mo. Energy dispersive spectroscopy (EDS) and electron energy loss spectroscopy (EELS) reveal that the carbides are enriched in Nb and N. The presence of Mo is also observed in the particles in the Nb-Mo steel during isothermal holding at 900 °C. The concentration of Mo in the precipitates decreases with increasing particle size and isothermal holding time. The precipitates in the Nb-Mo steel provide significant strengthening increments of up to 140 MPa, higher than that in the Nb steel, ~96 MPa. A thermodynamic rationale is given, which explains that the enrichment of Mo in the precipitates reduces the interfacial energy between precipitates and matrix. This is likely to lower the energy barrier for their nucleation and also reduce the coarsening rate, thus leading to finer precipitates during isothermal holding at 900 °C. Full article
(This article belongs to the Special Issue Strip Casting of Metals and Alloys)
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11 pages, 6388 KiB  
Article
Secondary Recrystallization Behavior in Fe-3%Si Grain-oriented Silicon Steel Produced by Twin-roll Casting and Simplified Secondary Annealing
by Yang Wang, Yuanxiang Zhang, Feng Fang, Xiang Lu, Guo Yuan and Guodong Wang
Metals 2020, 10(5), 660; https://doi.org/10.3390/met10050660 - 19 May 2020
Cited by 4 | Viewed by 2498
Abstract
Grain-oriented silicon steels were produced by the shortest processing route involving twin-roll strip casting, two-stage cold rolling with intermediate annealing, and simulated continuous annealing. The secondary recrystallization behavior of grain-oriented silicon steels under different inhibition conditions was in-situ observed by combining the confocal [...] Read more.
Grain-oriented silicon steels were produced by the shortest processing route involving twin-roll strip casting, two-stage cold rolling with intermediate annealing, and simulated continuous annealing. The secondary recrystallization behavior of grain-oriented silicon steels under different inhibition conditions was in-situ observed by combining the confocal laser scanning microscopy (CLSM) and electron backscattered diffraction (EBSD) techniques. The results revealed that the optimal temperature of secondary recrystallization showed a proportional relationship with the Zenner pinning force. In the case of weak pinning force, the abnormal grain growth occurred quickly at ~1050 °C. The corresponding growth rates were in the range of 60–1400 μm/min and decreased gradually as the secondary recrystallization proceeded. In the case of strong pinning force, the incubation time and onset temperature of the secondary recrystallization was significantly increased, but the total time of the secondary recrystallization was obviously shortened from 685 s to 479 s, and the final magnetic induction of B8 was increased from 1.7 T to 1.85 T. After the secondary annealing, some island grains and coarse primary grains were retained. The formation of island grain was related to the low migration of grain boundaries. The findings of coarse γ- grains indicated that the primary grain size also played a crucial role during secondary recrystallization, apart from the primary recrystallized texture, which attracted more attention previously. Full article
(This article belongs to the Special Issue Strip Casting of Metals and Alloys)
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Review

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23 pages, 44652 KiB  
Review
Twin Roll Caster for Clad Strip
by Toshio Haga
Metals 2021, 11(5), 776; https://doi.org/10.3390/met11050776 - 10 May 2021
Cited by 6 | Viewed by 2891
Abstract
Production of aluminum alloy clad strips requires many processes, and a reduction in the number of processes has long been demanded. A method to cast clad strips directly from molten metal using a twin roll caster with copper rolls is proposed in this [...] Read more.
Production of aluminum alloy clad strips requires many processes, and a reduction in the number of processes has long been demanded. A method to cast clad strips directly from molten metal using a twin roll caster with copper rolls is proposed in this work. Two types of twin roll casters were designed and tested. One was a vertical-type tandem twin roll caster and the other was a twin roll caster equipped with a scraper. The casting of the clad strips was conducted in an oxidizing atmosphere. The clad strips were cast at speeds higher than 15 m/min. This casting speed is much higher than that of conventional twin roll casters for aluminum alloys. The roll load was smaller than 0.2 kN/mm. This small roll load means that strips were not bonded by hot rolling. The clad strips had a clear interface between strips, and elements in each strip did not diffuse into other strips. The clad strips did not fracture at the interface in a tension shear test. This means that the clad strips were strongly bonded. Full article
(This article belongs to the Special Issue Strip Casting of Metals and Alloys)
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16 pages, 17762 KiB  
Review
High Speed Roll Caster for Aluminum Alloy
by Toshio Haga
Metals 2021, 11(3), 520; https://doi.org/10.3390/met11030520 - 22 Mar 2021
Cited by 15 | Viewed by 4416
Abstract
Two types of high-speed twin-roll casters and a single-roll caster equipped with a scraper were proposed. One of the twin-roll casters is a vertical-type high-speed twin-roll caster, and the other twin-roll caster is an unequal-diameter twin-roll caster. The vertical-type high-speed twin-roll caster can [...] Read more.
Two types of high-speed twin-roll casters and a single-roll caster equipped with a scraper were proposed. One of the twin-roll casters is a vertical-type high-speed twin-roll caster, and the other twin-roll caster is an unequal-diameter twin-roll caster. The vertical-type high-speed twin-roll caster can cast strip at speeds of up to 120 m/min. The unequal-diameter twin-roll caster casts strip at speeds up to 60 m/min. The unequal-diameter twin-roll caster is superior to the vertical-type high-speed twin-roll caster at the point of conveyance of the cast strip. A single-roll caster equipped with a scraper can cast strip without center-line segregation at speeds of up to 40 m/min. The use of a copper alloy roll and the non-use of a parting material enable high-speed roll casting. Since the roll loads of these casters are smaller than 0.1 kN/mm, soft copper alloy roll can be used. The strip does not stick to the roll without the parting material because of the use of the copper alloy roll with high thermal conductivity and the small roll load. The cooling rate near the surface is higher than 2000 °C/s. Full article
(This article belongs to the Special Issue Strip Casting of Metals and Alloys)
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