Reduction of Surface Cracks at Al-Mg Alloy Strip Surface Cast by Unequal Diameter Twin Roll Caster

Haga, Toshio; Yamazaki, Kazuki; Watari, Hisaki; Nishida, Shinichi

doi:10.4028/www.scientific.net/msf.1007.6

Cited by 8 publications

(5 citation statements)

References 10 publications

(10 reference statements)

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“…Surface cracking and center-line segregation occur in Al-Mg strip cast using the highspeed twin-roll caster. A molten-metal pouring method to reduce the surface cracking was proposed [43]. However, the reduction of the center-line segregation is difficult.…”

Section: Unequal Diameter Twin Roll Castermentioning

confidence: 99%

High Speed Roll Caster for Aluminum Alloy

Haga

2021

Metals

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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.

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Section: Unequal Diameter Twin Roll Castermentioning

confidence: 99%

High Speed Roll Caster for Aluminum Alloy

Haga

2021

Metals

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“…The unequal-diameter twin-roll caster (UDTRC) can cast the Al-25%Si strip [6][7][8][9]. The UDTRC is equipped with copper rolls.…”

Section: Introductionmentioning

confidence: 99%

Strip Casting of Al-25%Si-4%Mg Using Unequal Diameter Twin Roll Caster Equipped with Steel Rolls

Haga,

Ochi,

Fuse

et al. 2024

10th International Conference on Advanced Materials, Mechanics and Structural Engineering (AMMSE)

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Strip casting of Al–25%Si was tested using an unequal-diameter twin-roll caster equipped with steel rolls. To increase the cooling ability, the shell thickness was decreased to 6 mm. The solidification length was 180 mm to solidify Al–25%Si, which has large latent heat. 4% Mg was added to Al–25%Si to prevent the strip sticking to the roll without using parting material. A grooved roll was adopted for the upper roll to prevent solidification shrinkage and strip cracking during rolling. Al–25%Si–4%Mg strip could be cast at a roll speed of 10 m/min by these enhancements. The as-cast strip could be hot rolled down to 1 mm. A cross section of the strip was investigated using optical microscopy, and the primary Si and eutectic Si were found to be very fine.

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“…Some studies have also reported on degradation prevention due to Fe impurities in this alloy by the vertical-type high-speed twin-roll caster [8]. Al-Mg alloy cast in strips using a twin-roll caster has typical defects, including centerline segregation and surface cracks [9]. A single-roll caster equipped with a scraper can cast a strip without centerline segregation or surface cracking [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Strip Casting of Al-4.7%Mg with Impurity Fe Using a Single Roll Caster with a Scraper

Haga

Oida

Yamazaki

et al. 2022

MSF

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Fe was added to Al-4.7%Mg to make model alloys of recycled Al-Mg alloy. The effect of Fe addition on the mechanical properties of the Al-4.7%Mg strip cast using a single-roll caster equipped with a scraper was investigated. The added Fe content was 0.2, 0.4, 0.6, and 0.8%. The as-cast strip cast at 30 m/min was cold rolled down to a thickness of 1 mm thick annealed to conduct a tensile test and a cup test. The as-cast strip could be cold rolled without cracking. The tensile stress and the 0.2% proof stress were only slightly affected by the addition of Fe. The elongation gradually decreased as the Fe content increased. When the Fe content was 0.8%, the elongation in the casting direction was 27.7%. The limiting drawing ratio did not deteriorate until the Fe content was 0.4%. When the Fe content was 0.4% and 0.8%, the limiting drawing ratios were 2.0 and 1.7, respectively.

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Reduction of Surface Cracks at Al-Mg Alloy Strip Surface Cast by Unequal Diameter Twin Roll Caster

Cited by 8 publications

References 10 publications

High Speed Roll Caster for Aluminum Alloy

High Speed Roll Caster for Aluminum Alloy

Strip Casting of Al-25%Si-4%Mg Using Unequal Diameter Twin Roll Caster Equipped with Steel Rolls

Strip Casting of Al-4.7%Mg with Impurity Fe Using a Single Roll Caster with a Scraper

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