Three-Ply Al/Mg/Al Clad Sheets Fabricated by Twin-Roll Casting and Post-treatments (Homogenization, Warm Rolling, and Annealing)

2016 ◽  
Vol 48 (1) ◽  
pp. 57-62 ◽  
Author(s):  
Jaeyeong Park ◽  
Hyejin Song ◽  
Jung-Su Kim ◽  
Seok Su Sohn ◽  
Sunghak Lee
Keyword(s):  
Warm Rolling ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Twin Roll

Aging Effect on Texture Evolution during Warm Rolling of ZK60 Alloys Fabricated by Twin-Roll Casting

2010 ◽  
Vol 41 (10) ◽  
pp. 2575-2583 ◽  
Author(s):  
Jae-Hyung Cho ◽  
Hong-Mei Chen ◽  
Shi-Hoon Choi ◽  
Hyoung-Wook Kim ◽  
Suk-Bong Kang
Keyword(s):  
Texture Evolution ◽  
Aging Effect ◽  
Warm Rolling ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Twin Roll

Effect of Thermomechanical Processes on Twin Roll Casted Magnesium Alloy Sheets

2014 ◽  
Vol 783-786 ◽  
pp. 369-374
Author(s):  
Ozgur Duygulu ◽  
Selda Ucuncuoglu ◽  
Gizem Oktay Secgin
Keyword(s):  
Electron Microscopy ◽  
Magnesium Alloy ◽  
Tensile Tests ◽  
Warm Rolling ◽  
Age Hardening ◽  
Forming Limit ◽  
Casting Technique ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Twin Roll

6 mm thick and 1500 mm wide magnesium alloy AZ31, AZ61, AZ91, AM50 and AM60 sheets were produced by twin roll casting technique. Sheets were homogenized between 350-475oC for 1-24 h. AZ31 sheets were rolled down to 1 mm by symmetrical warm rolling and asymmetric warm rolling. Age hardening was also performed on magnesium alloy AZ91 sheets. Specimens were aged at 100-300oC for up to 100 h. Characterization was performed by light microscope, scanning electron microscopy-energy dispersive spectrometry (SEM-EDS), transmission electron microscopy (TEM) and x-ray diffraction (XRD) after twin roll casting and also after each thermomechanical process including aging. Tensile tests and micro hardness tests were performed for mechanical properties. In addition to the room temperature tests, elevated temperature tensile tests were also performed at 100, 150, 200, 250, and 300oC at various deformation speeds. Forming limit diagram of the material was determined under warm forming condition.

The Development of Superplastic Magnesium Alloy Sheet

2010 ◽  
Vol 433 ◽  
pp. 273-279 ◽  
Author(s):  
Richard J. Dashwood ◽  
David Klaumunzer ◽  
Martin Jackson ◽  
Zhong Yun Fan ◽  
Roger Grimes
Keyword(s):  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Warm Rolling ◽  
Alloy Sheet ◽  
Magnesium Alloy Sheet ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Strip Cast ◽  
Twin Roll ◽  
Cast Condition

While magnesium alloys are routinely used in engineering applications in the form of net shape castings, applications for sheet product have been limited due to the poor cold formability of magnesium combined with the perceived expense of sheet. The issues associated with poor cold formability could largely be overcome if magnesium alloys were to be superplastically formed. Superplasticity in magnesium is well established with research papers on the subject dating back to the late 1960s. In recent years, interest in this area has grown to the point where a number of companies have successfully superplastically formed prototype automotive panels from magnesium alloy sheet. Concurrent to this the scientific community have demonstrated superplasticity in a wide range of magnesium alloys using processing techniques ranging from the exotic (severe plastic deformation) to the mundane (traditional warm rolling). Work by the current authors has shown, rather surprisingly, that superplasticity can be achieved in magnesium alloys in the as-cast condition. This has led to some initial exploratory work involving twin roll casting. The concept being that affordable superplastic magnesium sheet could be produced via twin roll casting with only limited rolling reduction to final gauge. This paper describes the superplastic behaviour (in uniaxial tension) and microstructure of sheet processed from strip cast AZ31 and AZ91. The experimental material has included strip cast AZ91 subjected to large shear strains immediately prior to casting. The material was tested in the as-cast condition and after warm rolling to a number of gauges. Industrially useful superplastic capability was demonstrated in the strip cast alloys. Furthermore, good superplastic capability was also demonstrated in sheet subsequently rolled from the cast metal and rolling strain did not significantly influence the ductilities obtained. The mechanism for achieving superplasticity in as-cast magnesium alloys will be considered and the contrasting deformation characteristics of AZ31 and AZ91 will be discussed in terms of m value analysis and microstructural characterisation.

scholarly journals Mechanism of Electromagnetic Field in the Sub-RapidSolidification of High-Strength Al-Cu-Li Alloy Produced by Twin-Roll Casting

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 952
Author(s):  
Shiju Li ◽  
Bowen Wei ◽  
Wei Yu ◽  
Chen He ◽  
Yong Li ◽  
...  
Keyword(s):  
Body Force ◽  
High Strength ◽  
Solidification Structure ◽  
Experimental Characterization ◽  
Alloy Plate ◽  
Twin Roll Casting ◽  
Comprehensive Properties ◽  
Roll Casting ◽  
Mold Casting ◽  
Twin Roll

In this work, a Al-Cu-Li alloy plate with outstanding mechanical properties was successfully prepared with electromagnetic twin-roll casting (TRC) technology. The microstructure of Al-Cu-Li alloy manufactured by conventional mold casting, TRC, and electromagnetic TRC was studied in detail. The action mechanism of electromagnetic oscillation field (EOF) in the TRC process was studied by systematic experimental characterization and numerical simulation. The results show that the EOF will enlarge the circumfluence area in the cast-rolling zone, accelerate the mass transfer and heat transfer in the molten pool, and make the solute field and flow field in the liquid cavity tend to be evenly distributed. Further, the introduction of the EOF will produce the electromagnetic body force F with the maximum strength of 14 N/m3. The F acting on the solidification front will eliminate the accumulation and deposition of Cu2+, Li+, Mg2+, Zn2+, Mn2+ at the dendrite tip and inhibit the growth of dendrites. At the same time, the F can refine the microstructure of the TRC plate, promote the formation of equiaxed crystals, improve the supersaturated solid solubility of solute elements in the a(Al) matrix, and avoid the appearance of obvious solute segregation area or the formation of excessive solute enrichment area. Therefore, the macro-segregation in TRC plate was significantly reduced, the solidification structure was dramatically refined, and the comprehensive properties of the alloy were remarkably improved.

Effect of Secondary Cooling on Non-Oriented Electrical Steel Strips Produced by Twin-Roll Casting Process

2013 ◽  
Vol 690-693 ◽  
pp. 218-221
Author(s):  
Ting Zhang ◽  
Xiao Ming Zhang ◽  
Zhi Yuan Guo ◽  
Yu Qian Wang ◽  
Cheng Gang Li
Keyword(s):  
Electrical Steel ◽  
Casting Process ◽  
Air Cooling ◽  
Secondary Cooling ◽  
Twin Roll Casting ◽  
Steel Strips ◽  
Roll Casting ◽  
Average Size ◽  
Equiaxed Grains ◽  
Twin Roll

Effect of secondary cooling on non-oriented electrical steel strips was investigated. The 2.0 mm thick cast strips contain two compositions were produced by twin-roll casting process, cooled in the air or cooled by spraying water. The microstructure was observed by optical microscopy, and EBSD was used to characterize the texture of the cast strips. The results showed that air-cooling cast strips have uniform and equiaxed grains with average size of 250 μm. The microstructure of the water-spraying cast strips compose of most equiaxed grains and a small number of abnormal big grains. At the same time, the secondary cooling rate mildly affects the cast texture strength but has no influence on the texture type.

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