Effect of Cooling Rate on Microstructure and Properties of Twin-Roll Casting 6061 Aluminum Alloy Sheet

Xu, Zhiwu; Wang, Sixue; Wang, Hongbin; Shu, Hua; Li, Shengli; Chen, Xingyu

doi:10.3390/met10091168

Cited by 30 publications

(13 citation statements)

References 30 publications

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“…It is likely that this is attributed to the grains size which is significantly affected by the cooling rate, where the size of the grains increases, thus decreasing the hardness, with decreasing the cooling rate. These results are in agreement with data reported in literature [8,10,12]. The amount of heat dissipated from the first mould (Mould No.…”

Section: Hardnees Resultssupporting

confidence: 93%

“…It is well known that the microstructure of the material has a significant effect on the mechanical properties, where decreasing the grain size leads to improve mechanical properties, such as ductility and hardness [7] and resistance to corrosion [8]. In addition, decreasing in the size of the grains results in reducing the interface between the matrix and the phases and gives rise to a uniform distribution of solute components as well [9,10].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Mould Thickness on Microstructure, Hardness and Wear of AL-Cu Cast Alloys

Soliman

Ramadan

Yagoob

2021

IJE

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Aluminium-copper alloys have a wide range of industrial applications especially in military vehicles, rocket fins and aerospace. Solidification plays a vital role in controlling the mechanical and tribological properties, and influencing the microstructure of metallic alloys in general and aluminium alloys in particular. Therefore, the researchers have made many efforts to figure out the solidification behaviour of Al-Cu alloys. Despite all these endeavors, however, the behavior is not yet fully understood. This research aims to investigate the effect of cooling rate on the microstructure, mechanical and tribological properties of aluminium-copper cast alloys (Al-Cu alloys) under dry sliding conditions. Four cooling rates were achieved by using four various steel moulds made of different thicknesses and one of them was surrounded with green sand, to get a lower cooling rate, with the same respective mould hole geometries. The microstructure results showed that the grain size increases with decreasing the cooling rate. While the hardness increased largely due to the refinement of the microstructure. Finally, it was concluded that the wear rate increases with decreasing the cooling rate, and that is due to the reduction in hardness.

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Section: Hardnees Resultssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Influence of Mould Thickness on Microstructure, Hardness and Wear of AL-Cu Cast Alloys

Soliman

Ramadan

Yagoob

2021

IJE

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“…The difference in density values that occurred between samples was due to the porosity within the DTM feedstock billets. The porosity inside the feedstock billets occurred when molten metal shrinks and the gas trapped within the feedstock billets during the solidification [9,11]. The combination of pouring temperature, which closes to liquidus temperature, and longer holding time allowed the gas within the copper mould to vanish to the environment.…”

Section: Resultsmentioning

confidence: 99%

“…The processing parameters, such as pouring temperature and holding time, play a major role in SSMP to produce globular microstructure. The pouring temperature above the liquidus temperature, at 652 °C, provides a high cooling rate effect and improved the nucleation rate during the solidification stage [7,11]. The low pouring temperature enhanced the formation of spheroidal formation.…”

Section: Introductionmentioning

confidence: 99%

Effects of Direct Thermal Method Processing Parameters on Mechanical Properties of Semisolid A6061 Feedstock

Tajudin

Ahmad

Rashidi

2021

IJAME

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This paper highlights the effects of pouring temperature and holding time on the mechanical properties of aluminium 6061 semisolid feedstock billets. The semisolid metal feedstock billets were prepared by a direct thermal method (DTM), in which the molten metal was poured into a cylindrical copper mould with a different combination of pouring temperature and holding time before it was solidified in room temperature water. The results show that the sample with pouring temperature slightly above aluminium 6061 liquidus temperature has the lowest porosity, thereby the highest mechanical properties value. The sample with a pouring temperature of 660 °C and holding time of 60 s has the density, tensile strength and hardness properties of 2.701 g/cm3, 146.797 MPa, and 86.5 HV, respectively. Meanwhile, the sample at a pouring temperature of 640 °C and holding time of 20 s has density, tensile strength and hardness properties of 2.527 g/cm3, 65.39 MPa, and 71.79 HV, respectively. The density and fractography tests were conducted to confirm the existence of porosity within the samples. The results from these experimental works suggested that the mechanical properties of DTM semisolid feedstock billet merely depended on processing parameters, which influenced the porosity level within the feedstock billet, thus directly affected their mechanical properties.

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“…This means that the productivity is low. The roll speed of the CTRCA is lower than 5 m/min [1][2][3][4][5][6][7][8][9][10][11]. The roll speed of most CTRCAs is usually slower than 2 m/min.…”

Section: Introductionmentioning

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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Effect of Cooling Rate on Microstructure and Properties of Twin-Roll Casting 6061 Aluminum Alloy Sheet

Cited by 30 publications

References 30 publications

Influence of Mould Thickness on Microstructure, Hardness and Wear of AL-Cu Cast Alloys

Influence of Mould Thickness on Microstructure, Hardness and Wear of AL-Cu Cast Alloys

Effects of Direct Thermal Method Processing Parameters on Mechanical Properties of Semisolid A6061 Feedstock

High Speed Roll Caster for Aluminum Alloy

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