scholarly journals Mg-Based Materials with Quasiamorphous Phase Produced by Vertical Twin-Roll Casting Process

Metals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 452 ◽  
Author(s):  
Hai Liu ◽  
Wenxin Li ◽  
Zhipu Pei ◽  
Mengyuan Yan
Keyword(s):  
Casting Speed ◽  
Cast Alloy ◽  
Casting Process ◽  
Cooling Capacity ◽  
Strip Casting ◽  
Fine Grained ◽  
Rare Earth Alloy ◽  
Roll Casting ◽  
Casting Experiment ◽  
Twin Roll

Metallic materials with micron grains, submicron grains, or amorphous structures have attracted great interest in recent decades owing to their excellent mechanical properties and corrosion resistance. Compared with traditional forming processes, rapid solidification technology has shown great superiority and potential in the preparation of materials in such structures. In this study, fine-grained quasiamorphous Mg-based alloy strips fabricated by a twin-roll strip casting process were explored using simulation and experimental methods. The concept of critical casting speed was proposed to reflect the optimum casting conditions. The product of critical casting speed and strip thickness was used to evaluate the cooling capacity of the casting system. Based on simulation results, a twin-roll strip-casting experiment was performed on a Mg-rare earth alloy. A novel puddle-like microstructure of the as-cast alloy strip was obtained. Tensile testing results showed that the novel strip exhibited improved ductility.

405 Continuous strip casting of copper alloy by vertical twin roll casting process

2015 ◽  
Vol 2015.23 (0) ◽  
pp. 137-138
Author(s):  
Tomohisa TAKADA ◽  
Fumiya YAMANO ◽  
Yuki AKAIKE ◽  
Yoshitaka SATO ◽  
Masaru FUJITA ◽  
...  
Keyword(s):  
Copper Alloy ◽  
Casting Process ◽  
Strip Casting ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Twin Roll ◽  
Continuous Strip

Influence of Casting Speed on Temperature and Flow Fields in Molten Pool during Twin-Roll Strip Casting Process

2006 ◽  
Vol 505-507 ◽  
pp. 1315-0
Author(s):  
Xiao Ming Zhang ◽  
Zheng Yi Jiang ◽  
Xiang Hua Liu ◽  
Guo Dong Wang ◽  
L.M. Yang ◽  
...  
Keyword(s):  
Casting Speed ◽  
Molten Pool ◽  
Metal Flow ◽  
Flow Analysis ◽  
Casting Process ◽  
Strip Casting ◽  
The Stability ◽  
Twin Roll ◽  
Temperature And Flow Fields

In twin-roll strip casting process, the casting speed has a significant influence on the metal flow and temperature distribution in the molten pool, which will affect the stability of this process and the quality of the produced products. Based on a 3D coupled thermal-flow analysis, a combination of the experimental results for twin-roll strip casting of stainless steel, heat equilibrium calculation and simulation results was conducted, and the boundary conditions of the heat exchange between the rolls and molten pool has been treated effectively. The effect of the casting speed on the flow and temperature in the molten pool was given. Simulation result is in agreement with the measured value.

Flow and Temperature Analysis of Molten Pool in Twin-Roll Strip Casting Process

2007 ◽  
Vol 340-341 ◽  
pp. 695-700 ◽  
Author(s):  
Xiao Ming Zhang ◽  
Zheng Yi Jiang ◽  
L.M. Yang ◽  
Xiang Hua Liu ◽  
Guo Dong Wang
Keyword(s):  
Molten Pool ◽  
Metal Flow ◽  
Casting Process ◽  
Strip Casting ◽  
Roll Casting ◽  
Quality Of Products ◽  
The Stability ◽  
Experimental Values ◽  
Twin Roll

In twin-roll strip casting process, metal flow and temperature distribution in the molten pool directly affect the stability of the process and the quality of products. In this paper, a 3D coupling temperature-flow finite element simulation during twin-roll strip casting has been carried out, and the influences of the outlet angle and the submerged depth on the temperature and flow fields in the molten pool were investigated for the twin-roll casting of stainless steel. An inverse method was used to determine the boundary conditions between the roll and molten pool. Simulation results are consistent with the experimental values. Numerical simulation is helpful to optimise the twin-roll strip casting process and to improve the quality of products in practice.

Casting speed optimal design of 304 stainless steel during twin roll strip casting process by 3D modelling

2014 ◽  
Vol 30 (12) ◽  
pp. 1453-1460
Author(s):  
Y. Y. Liu ◽  
L. G. Liu ◽  
J. Guo ◽  
L. L. Liu ◽  
Y. Zhang ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Optimal Design ◽  
Casting Speed ◽  
Casting Process ◽  
3D Modelling ◽  
Strip Casting ◽  
304 Stainless Steel ◽  
Twin Roll

scholarly journals Review on Vertical Twin-Roll Strip Casting: A Key Technology for Quality Strips

2016 ◽  
Vol 2016 ◽  
pp. 1-13 ◽  
Author(s):  
Seshadev Sahoo
Keyword(s):  
Casting Process ◽  
Strip Casting ◽  
Iron And Steel Industry ◽  
Iron And Steel ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Near Net Shape ◽  
The Subject ◽  
Twin Roll ◽  
Metal Delivery

Nowadays near-net-shape casting technology is an important area of research in the iron and steel industry. Among different kinds of near-net-shape casting process, twin-roll casting process has received much attention among researchers. Twin-roll casting (TRC) has been the subject of extensive research, not only to develop the technology but also to achieve an understanding of microstructural evolution and to produce quality strips. The main issues concerning the design and operation of twin-roll casters are metal-mold heat transfer, metal delivery system, and their possible effects on the solid shell formation and characteristics of the strips. The present review gives an idea about the process aspect, modeling, and quality issues in vertical twin-roll strip casting process and helps to improve the design of twin-roll strip caster.

Analysis of Casting Roll Temperature Field during Twin-Roll Thin Strip Casting

2008 ◽  
Vol 32 ◽  
pp. 169-172 ◽  
Author(s):  
Xiao Ming Zhang ◽  
Zheng Yi Jiang ◽  
Hei Jie Li ◽  
Z. Fan ◽  
Xiang Hua Liu ◽  
...  
Keyword(s):  
Temperature Field ◽  
Thermal Deformation ◽  
Casting Process ◽  
Processing Parameters ◽  
Strip Casting ◽  
Thin Strip ◽  
Surface Cracks ◽  
Roll Temperature ◽  
Roll Casting ◽  
Twin Roll

In twin-roll strip casting process, the temperature variation of casting roll can result in roll thermal stress and fatigue. It not only affects the thermal deformation of casting roll and the generation of the roll surface cracks significantly, but also influences the surface quality, shape and profile of the produced strip, and the service life of the casting roll. In this paper, a 3D coupling thermal-flow finite element modelling has been conducted. For twin-roll casting of stainless steel, the influences of the casting speed and liquid level in molten pool on the temperature field of casting roll have been simulated and discussed. The developed model is very helpful in optimising the processing parameters and the design of casting roll during twin-roll thin strip casting.

The Microstructure and Processing in Twin Roll Casting of Magnesium Alloy Strip

2005 ◽  
Vol 488-489 ◽  
pp. 427-430 ◽  
Author(s):  
Chun Mei Yang ◽  
Ding Fei Zhang ◽  
Pei Dao Ding ◽  
Fu Sheng Pan
Keyword(s):  
Magnesium Alloy ◽  
Casting Process ◽  
Strip Casting ◽  
Casting Temperature ◽  
Process Stability ◽  
Cast Strip ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Twin Roll ◽  
Cast Microstructure

Magnesium has a hexagonal close-packed crystal structure which makes it more difficult to deform than aluminum. Conventional strip production usually requires several process steps to reach the final strip thickness. Strip casting can reduce some of the process steps and make strip processing simpler and easier, especially for alloys with poor deformability. The twin-roll casting process can directly obtain strips with thickness less than one or two millimeters. In this paper, the metallurgical characteristics of the twin-roll strip casting process were analyzed and discussed. A laboratory scale vertical twin roll caster in prepared AZ31 magnesium alloy strips, with 1.0 to 2.0 mm thick and 150mm wide. Process stability in the thin strip casting process of the alloy has been studied, the casting temperature (superheat) was proven to be a key factor influencing process stability and casting strip quality. The as-cast microstructure of the alloy was analyzed and evaluated by optical microscopy, which showed that the as-cast microstructure was composed of developed dendrites when the superheat was high, and of a rosebush-like structure when the superheat was low. When the casting temperature was close to the liquid phase temperature，the as-cast microstructure became global or grainy, and the grain size of the cast strip was very small. This remarkably improved the deformability of the as-cast strip.

Mechanical Properties and Metallurgical Qualities of Magnesium Alloy Sheets Manufactured by Twin-Roll Casting

2007 ◽  
Vol 345-346 ◽  
pp. 165-168 ◽  
Author(s):  
Hisaki Watari ◽  
Ryoji Nakamura ◽  
R. Paisern ◽  
Nobuhio Koga ◽  
Keith Davey
Keyword(s):  
Magnesium Alloy ◽  
Casting Process ◽  
Rolling Process ◽  
Extrusion Process ◽  
Strip Casting ◽  
Drawing Ratio ◽  
Magnesium Sheet ◽  
Roll Casting ◽  
Cast Magnesium ◽  
Twin Roll

This paper is concerned with a manufacturing process and technology to facilitate the economical manufacture of high-quality magnesium alloy sheets. Magnesium alloys AZ31, AZ61, AM60 and AZ91 were used to investigate the appropriate anufacturing conditions for use in twin-roll strip casting. Temperatures of the molten materials and roll speeds were varied to find the appropriate manufacturing conditions. The effects of manufacturing conditions on possible forming were clarified in terms of roll speeds and roll gaps between upper and lower rolls. In addition, microscopic observation of the microstructure of the finished casting was performed. It was clarified that a magnesium sheet of 2.5 to 4.5mm thickness could be produced at a speed of 20 m/min by a horizontal copper roll caster. It was also found that the cast magnesium sheet of AZ31, AZ61, AM60 and AZ91 manufactured by roll strip casting could be used for plastic forming if the appropriate magnesium sheets were produced after the roll casting process. By a warm deep drawing test, it also demonstrated that a limiting drawing ratio of 2.4 was possible in the case of AZ91 sheet that was difficult to be manufactured by conventional extrusion process or DC casting and hot-rolling process for magesium alloy sheets with high aluminium contents.

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