Strip Casting of Al-25%Si Alloy

2012 ◽  
Vol 430-432 ◽  
pp. 669-672
Author(s):  
Toshio Haga ◽  
Hideto Harada ◽  
Shinji Kumai ◽  
Hisaki Watari
Keyword(s):  
Strip Casting ◽  
Rolled Strip ◽  
Thickness Direction ◽  
Cast Strip ◽  
Primary Si ◽  
Eutectic Si ◽  
Cold Rolled ◽  
Twin Roll Caster ◽  
Hot Rolled ◽  
Twin Roll

Strip casting of Al-25%Si strip was tried using an unequal diameter twin roll caster. The diameter of the lower roll (large roll) was 1000mm and the diameter of the upper roll (small roll) was 250mm. Roll material was mild steel. The sound strip could be cast at the speeds ranging from 8 m/min to 12 m/min. The strip did not stick to the roll without the parting material. The primary Si, which existed at centre area of the thickness direction, was larger than that which existed at other area. The size of the primary Si was smaller than 0.2 mm. Eutectic Si was smaller 5μm. The as-cast strip was ranging from 2mm to 3mm thick and its width was 100mm. The as-cast strip could be hot rolled down to 1mm. The hot rolled strip was cold rolled. The primary Si became smaller and the pore occurred around the primary Si after the rolling.

Investigation on Microstructure, Texture and Tensile Properties of Hot Rolled Strip Casting Grain-Oriented Silicon Steel

2013 ◽  
Vol 395-396 ◽  
pp. 297-301
Author(s):  
Hong Yu Song ◽  
Hui Hu Lu ◽  
Hai Tao Liu ◽  
Guo Dong Wang
Keyword(s):  
Tensile Test ◽  
Casting Process ◽  
Fiber Texture ◽  
Silicon Steel ◽  
Strip Casting ◽  
Rolled Strip ◽  
Fracture Surface Morphology ◽  
Cast Strip ◽  
Hot Rolled ◽  
Twin Roll

An Fe-3wt% Si as-cast strip was produced by twin-roll strip casting process. The as-cast strip was hot rolled at 1150°C by one pass of 20% reduction and coiled at 550°C. The tensile test was carried out and the elongation was measured. The microstructure and texture of the coiled strip and the fracture surface morphology of the tensile samples were characterized. It is found that the microstructure of the as-cast strip was characterized by columnar ferrite grains with pronounced {001}<0vw> fiber texture and martensite. The microstructure of coiled strip consisted of ferrite grains and pearlite, and the texture was mainly characterized by {001}<0vw> fiber texture. The necking was absent during the tensile test and the elongation of coiled strip was as low as 12%. The fracture surfaces of the tensile samples mainly exhibited cleavage fracture mode with coarse cleavage facets and some ligaments.

Single Roll Caster Equipped with a Scraper

2012 ◽  
Vol 504-506 ◽  
pp. 1243-1248 ◽  
Author(s):  
Toshio Haga ◽  
Kazuya Akitsu ◽  
Keisuke Kamakura ◽  
Shinji Kumai ◽  
Hisaki Watari
Keyword(s):  
Contact Surface ◽  
Outer Side ◽  
Rolled Strip ◽  
Drawing Ratio ◽  
Cast Strip ◽  
Strip Cast ◽  
Cold Rolled ◽  
Twin Roll Caster ◽  
Deep Drawing Test ◽  
Twin Roll

A scraper was developed and attached to the single roll caster in order to improve the free solidified surface of as-cast strip cast. Semisolid metal on the free solidified surface was flattened by the scraper and the surface became flat. The AA5182 aluminum alloy could be cast at speeds up to 40m/min. Thickness was about 3mm. Pressure of the unit width of the scraper was ranging from 0.1N/mm to 1.0N/mm, and these pressure was enough to make the free solidified surface flat. Center line segregation did not occur as the strip was solidified from single side at the strip cast by the single roll caster. Roll-cast strip could be cold rolled down to 1mm. There was not difference between the roll contact surface and the free solidified surface of the strip after cold rolling judging by a visual examination. Result of tension test of the roll cast and cold rolled strip was as same as that of D.C. cast and rolled strip. Deep drawing test was operated at the conditions both of the roll contact surface and the free solidified surface were outer side. LDR (limited drawing ratio) was same at both conditions and they were 1.8. Thickness of the strip was controlled by the roll speed, solidification length (length of the melt pool) and pressure of the scraper. The single roll caster is simpler than a twin roll caster. Rigidity for rolling was not required for the single roll caster. Cost of the roll is half comparing a twin roll caster. The equipment cost of the single roll caster is more economy than that of the twin roll caster.

Roll Casting of Al-SiCp Strip

2011 ◽  
Vol 675-677 ◽  
pp. 811-814 ◽  
Author(s):  
Toshio Haga ◽  
Teppei Nakamura ◽  
S. Kumai ◽  
H. Watari
Keyword(s):  
Hot Rolling ◽  
High Speed ◽  
Strip Casting ◽  
Cast Strip ◽  
Fine Grain ◽  
Roll Casting ◽  
Speed Up ◽  
Cold Rolled ◽  
Twin Roll Caster ◽  
Twin Roll

The strip casting of Al-SiCp alloy was operated by a high speed twin roll caster. The content of SiCp was 20Vol% and 30Vol%. Both of Al-20Vol%SiCp and Al-30Vol%SiCp strips could be cast continuously at the speed up to 90m/min. The SiCp particle distributed uniformly. This was the effect of fine grain of the strip. The as-cast strip of Al-20Vol%SiCp could be cold rolled after homogenization. The as-cast strip of Al-30Vol%SiCp could be cold rolled after once hot rolling and annealing. The as-cast strip of Al-20Vol%SiCp could be coiled at the diameter of 460mm.

Improvement of Surface Roughness of Al-Si Alloy Cast Strip by Vertical Melt Drag Process

2011 ◽  
Vol 383-390 ◽  
pp. 3954-3959 ◽  
Author(s):  
Shinichi Nishida ◽  
Kazuki Fukudome ◽  
H. Furusawa ◽  
M. Motomura ◽  
H. Watari
Keyword(s):  
Surface Roughness ◽  
Casting Process ◽  
Strip Casting ◽  
Rolled Strip ◽  
Strip Surface ◽  
Cast Strip ◽  
Negative Effect ◽  
Hot Rolled ◽  
Twin Roll ◽  
Alloy Cast

Strip casting process is possible to shorten for producing strip. Strip is produced from molten metal continuously and directly by strip casting process. Melt drag process is one of the single roll strip casting process. Melt drag process is simpler than general twin roll strip casting process. One of defect of cast strip is surface conditions, for example surface roughness. Cast strip surface roughness is larger than hot rolled strip. Large strip surface roughness is negative effect for cold rolling after strip casting or hot rolling. The aim of this study is improvement of cast strip surface roughness by melt drag process. We suggested vertical melt drag process. And investigations were operated such us producing conditions of Al-Si alloy strip, surface roughness of cast strip and microstructures.

Casting of Al-25%Si Strip Using a Vertical Type Twin Roll Caster

2011 ◽  
Vol 239-242 ◽  
pp. 1944-1947
Author(s):  
Toshio Haga ◽  
Hideto Harada ◽  
Shinji Kumai ◽  
Hisaki Watari
Keyword(s):  
High Speed ◽  
Strip Casting ◽  
Cast Strip ◽  
Roll Casting ◽  
Twin Roll Caster ◽  
Roll Gap ◽  
Hot Rolled ◽  
Semisolid Casting ◽  
Twin Roll

Strip casting of Al-25%Si was tried using the vertical type high speed twin roll caster. Some devices were adopted to enable the strip casting of Al-25%Si. Control of the roll gap, semisolid casting and non-use of the lubricant were useful devices to cast Al-25%Si strip. Roll-casting-ability of the Al-25%Si was discussed. The strip could be cast at 20m/min and 40m/min. As-cast strip was hot rolled down to 1mm by one pass. Bulging was tried at 550°C and it was able.

Roll Casting of Al-25mass%Si

2010 ◽  
Vol 97-101 ◽  
pp. 1057-1060 ◽  
Author(s):  
Ryoji Nakamura ◽  
Masayuki Saito ◽  
Shinji Kumai ◽  
Hisaki Watari
Keyword(s):  
Aluminum Alloy ◽  
Casting Speed ◽  
Alloy Strip ◽  
Thickness Direction ◽  
Near Surface ◽  
Roll Casting ◽  
Eutectic Si ◽  
Cold Rolled ◽  
Twin Roll Caster ◽  
Twin Roll

Roll casting of Al-25mass%Si hyper eutectic aluminum alloy strip was tried by an unequal diameter twin roll caster. The casting speed was 10m/min. The thickness of the strip was about 2mm. The eutectic Si and primary crystallized Si were very fine by the effect of the rapid solidification. The size of the primary crystallized Si was not uniform at the thickness direction. The primary crystallized Si at the near surface was finer than that of inside. The eutectic Si was finer than 2μm. The strip could be cold rolled after hot rolling and annealing.

Structure and Precipitation of Strip As-Cast and Hot-Rolled by TSCR on Oriented Silicon Steel

2011 ◽  
Vol 686 ◽  
pp. 506-510
Author(s):  
Yong Mei Yu ◽  
Yun Bo Xu ◽  
Yuan Xiang Zhang ◽  
Ting Zhang ◽  
Xiao Ming Zhang ◽  
...  
Keyword(s):  
Silicon Steel ◽  
Strip Casting ◽  
Rolled Strip ◽  
Texture Gradient ◽  
Air Cooling ◽  
Thin Slab Casting ◽  
Hot Rolled Strip ◽  
Slab Casting ◽  
Hot Rolled ◽  
Twin Roll

The simulation studies were carried out on the oriented silicon steel produced by thin slab casting and rolling (TSCR) and twin-roll strip casting in the laboratory. The precipitation of inhibiter, formation of microstructure and texture were investigated before cold rolling. The inhomogeneous microstructure and texture gradient were observed in the 7-pass hot-rolled strip（2mm）for TSCR process, and texture gradient was not changed after normalizing, and the twin-roll strip casting directly supplied a strip with approx 2mm of thickness being same as that of hot-rolled strip by TSCR. The microstructure of twin-rolling casting strip was almost composed of all equiaxed grains which similar to the normalizing microstructure in TSCR process, but the random texture was obtained by twin-rolling strip casting. The dispersed and clustered precipitates were presented in hot-rolled strip when the ingots were soaked at 1200°C and 1150°C respectively for the TSCR process. And disperse and acicular precipitates were observed by TEM for air-cooling cast strips for process twin-rolling casting.

Roll Casting of Aluminum Alloy Strip by a Single Roll Caster Equipped with a Scraper

2012 ◽  
Vol 445 ◽  
pp. 307-312 ◽  
Author(s):  
Toshio Haga ◽  
Kazuya Akitsu ◽  
Shinji Kumai ◽  
Hisaki Watari
Keyword(s):  
Aluminum Alloy ◽  
Contact Surface ◽  
Rolled Strip ◽  
Drawing Ratio ◽  
Cast Strip ◽  
Roll Casting ◽  
Single Side ◽  
Twin Roll Caster ◽  
Deep Drawing Test ◽  
Twin Roll

A single roll caster equipped with a scraper was devised to cast the strip with sound free solidified surface. A property of this single caster is equipment of the scraper. Semisolid metal on the free solidified surface was scribed by a scraper and the surface became flat. Center line segregation did not occur as the strip was solidified from single side. The AA5182 aluminum alloy could be cast at speeds up to 40m/min. Thickness was about 3mm. Pressure of the unit width from the scraper was ranging from 0.1N/mm to 1.0N/mm, and these pressure was enough to make the free solidified surface flat. Roll cast strip could be cold rolled down to 1mm. There was not difference between roll contact surface and the free solidified surface after cold rolling by a visual examination. Result of tension test of the roll cast strip was as same as that of D.C. cast and rolled strip. Deep drawing test was operated at the conditions both of the roll contact surface and the free solidified surface was outside. LDR (limited drawing ratio) was same at both conditions and they were 1.8. Thickness of the strip was controlled by the roll speed, solidification length (length of the melt pool) and pressure of the scraper. The single roll caster is simpler than a twin roll caster. Rigidity for rolling was not needed for the single roll caster. Cost of the roll is half comparing a twin roll caster. The equipment cost of the single roll caster is more economy than that of the twin roll caster.

Roll Casting of Al-SiCp Composite Strip

2010 ◽  
Vol 139-141 ◽  
pp. 481-484
Author(s):  
Ryoji Nakamura ◽  
Teppei Nakamura ◽  
Ryoji Nakamura ◽  
Hideto Harada ◽  
Shinji Kumai ◽  
...  
Keyword(s):  
Cold Rolling ◽  
High Speed ◽  
Alloy Strip ◽  
Thickness Direction ◽  
Composite Alloy ◽  
Cast Strip ◽  
Roll Casting ◽  
Twin Roll Caster ◽  
Twin Roll ◽  
Steel Rolls

Roll casting of Al-SiCp composite alloy strip was tried using a vertical type high speed twin roll caster equipped with mild steel rolls. The Al-20vol% SiCp and Al-30vol%SiCp alloy could be roll-cast to the strip. The casting speed was 30m/min. The thickness of as-cast strip was thinner than 2.5mm. The SiCp powder was dispersed uniformly at the thickness direction. The as-cast strip could be thin down to 1mm by the hot rolling and the cold rolling without broken.

Strip Casting of 6061 and Recycled 6061 Alloy by an Unequal Diameter Twin Roll Caster

2011 ◽  
Vol 264-265 ◽  
pp. 1911-1916 ◽  
Author(s):  
Toshio Haga ◽  
Hideki Inui ◽  
Ryoji Nakamura ◽  
Shinji Kumai ◽  
Hisaki Watari
Keyword(s):  
Aluminium Alloy ◽  
Surface Condition ◽  
Bending Test ◽  
Cast Strip ◽  
Fe Content ◽  
Strip Cast ◽  
Cold Rolled ◽  
Twin Roll Caster ◽  
6061 Aluminium Alloy ◽  
Twin Roll

A 6061 aluminium alloy and an alloy with increased Fe content, representing recycled 6061 aluminium alloy were cast into strips at speed of 30m/min by an unequal diameter twin roll caster. The Fe content of 6061 aluminium alloy and the model of recycled 6061 aluminium alloy was 0.36 mass% and 0.59 mass%, respectively. Ripple marks, which are typical surface defect of roll cast strips, did not occur on the surface of both as-cast strips. Fe content did not influence the surface condition of the roll-cast-strip. The as-cast strip was cold rolled down to 1 mm, T4 heat treatment was conducted, and then subjected to180 degrees bending test. The result of 180 degrees bending test shows that roll cast 6061 aluminium alloy and 6061 aluminium alloy with increased Fe as recycled had bending ability as same as that of roll-cast 6022 aluminium alloy. In the strip cast by the twin roll caster of the present study, increased Fe content did not influence on the result of the180 degrees bending test.

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