Influence of Sticking on the Roll Topography at Twin-Roll Casting of Aluminum Alloys

2017 ◽  
pp. 827-831 ◽  
Author(s):  
Olexandr Grydin ◽  
Florian Nürnberger ◽  
Mirko Schaper
Keyword(s):  
Aluminum Alloys ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Twin Roll

scholarly journals Simulation of Solidified Microstructure and Experimental Comparative Study of Twin-Roll Casting Aluminum Alloys

2017 ◽  
Vol 2017 ◽  
pp. 1-7
Author(s):  
Teng Ma ◽  
Junting Zhang ◽  
Xiaochao Cui ◽  
Xiaosi Sun
Keyword(s):  
Aluminum Alloys ◽  
Solidification Process ◽  
Tensile Tests ◽  
Metallographic Examination ◽  
Twin Roll Casting ◽  
Dendrite Arm Spacing ◽  
Roll Casting ◽  
Cellular Automaton Method ◽  
Casting Aluminum ◽  
Twin Roll

A coupled macro-micro mathematical model of twin-roll casting was established in the study. The continuous solidification process of Al-10Mg aluminum alloys in front of the nip point was numerically simulated by the cellular automaton method and the solidification microstructure, dendritic grain radius, and secondary dendrite arm spacing were obtained through simulation to predict the mechanical property of wedge strips. In order to verify the reliability of the simulation results, the metallographic examination and tensile tests were performed with the as-cast specimens. The results showed that the gain size, the distribution characteristics of various grain regions, dendrite arm spacing, and the yield strengths obtained from simulation were consistent with experimental results.

scholarly journals Role of Roll Separating Force in High-Speed Twin-Roll Casting of Aluminum Alloys

Metals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 645 ◽  
Author(s):  
Min-Seok Kim ◽  
Hyoung-Wook Kim ◽  
Su-Hyeon Kim ◽  
Shinji Kumai
Keyword(s):  
Aluminum Alloys ◽  
Casting Speed ◽  
High Speed ◽  
Rolling Texture ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Fine Microstructure ◽  
Roll Separating Force ◽  
Twin Roll

The role of the roll separating force in the high-speed twin-roll casting of aluminum alloys was examined. In horizontal-type twin-roll casting, as the casting speed increased upon decreasing the roll separating force, the strip texture changed from a shear and rolling texture to a random texture. Direct temperature measurements during high-speed twin-roll casting showed that the roll separating force played a significant role in maintaining a good contact between the strip and the roll surface. This resulted in a high cooling rate around the roll nip and enabled the fabrication of a sound strip with a fine microstructure. Moreover, the high casting speed and lowered roll separating force gave a band structure consisting of fine globular grains in the mid-thickness region of the strip, which could be considered beneficial in the formation of a well-dispersed center segregation.

Twin-Roll Casting of Aluminum Alloys – An Overview

2014 ◽  
Vol 29 (6) ◽  
pp. 651-661 ◽  
Author(s):  
N. S. Barekar ◽  
B. K. Dhindaw
Keyword(s):  
Aluminum Alloys ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Twin Roll

Influence of Microstructural Constituents and Applied Thermomechanical Processes on Corrosion Behaviour of Aluminum Alloys Produced with Twin Roll Casting (TRC) Technique

2014 ◽  
Vol 794-796 ◽  
pp. 181-186 ◽  
Author(s):  
Cemil Işıksaçan ◽  
Mert Günyüz ◽  
Onur Birbaşar ◽  
Cengiz Konya ◽  
Murat Dündar
Keyword(s):  
Free Surface ◽  
Aluminum Alloys ◽  
Corrosion Behaviour ◽  
Corrosion Mechanism ◽  
General Corrosion ◽  
Corrosion Performance ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Thermomechanical Processes ◽  
Twin Roll

Aluminum alloys produced with Twin Roll Casting (TRC) technology still necessitate to be thoroughly investigated in some areas. Corrosion mechanisms operating under special conditions with the contribution of unique features of the microstructure are among those. Materials produced with TRC have unique features inherently generated due to the solidification path of the material during casting. Contrary to the very fine particles at the locations close to the free surface, centerline segregation (CLS) occurring at the mid-plane of the thickness have different morphological and compositional features than rest of the microstructure. While, unless directly exposed, it has almost no contribution to the general corrosion behavior of the alloy, some manufacturing processes generation new free surfaces in the material for CLS to be exposed to the corrosive media can be harmful for overall general corrosion performance of the alloy. It differentiates itself in corrosion behaviour with its compositional and morphological features than rest of the microstructure. Hence, influence of CLS on corrosion behaviour of two different alloys in 3000 and 8000 series employed for heat exchangers and packaging applications, respectively, are studied in the present study. Since CLS does not disappear with rolling passes but only changes its morphology, samples were taken at appropriate thickness of the downstream process that allow corrosion tests to be conducted at the cross section of the samples. Metallographical preparation techniques were used to reveal the CLS. Samples were dipped in to the HCl-NaCl containing test solution to observe the progress of corrosion in the matrix and heavily populated CLS areas during the course of test. Open-circuit potential (OCP) measurements were carried out on the rolled free surface, quarter plane and mid plane of the samples after milling the surface of the samples. Different samples produced with compositional and thermomechanical processing route variants were used. Results show that composition of the alloy and applied thermomechanical processes influence the corrosion characteristics of CLS and accordingly the overall corrosion performance. Other important finding is the contribution of manufacturing method to corrosion mechanism whether if it reveals the CLS by creating new free cross sectional surfaces.

scholarly journals Application and Research Twin Roll Casting-Extruding Process for Production Longish Deformed Semi-Finished Products from Aluminum Alloys

2018 ◽  
Vol 918 ◽  
pp. 13-20 ◽  
Author(s):  
Sergey Sidelnikov ◽  
Roman Galiev ◽  
Andrey Bersenev ◽  
Denis Voroshilov
Keyword(s):  
Aluminum Alloys ◽  
Combined Treatment ◽  
Experimental Studies ◽  
Strength Properties ◽  
Drawing Ratio ◽  
Ferrous Alloys ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Traditional Technologies ◽  
Twin Roll

At present, Russia is actively developing methods of combined treatment of aluminum alloys, one of which is the method of twin roll casting-extruding. It is very suitable for processing aluminum alloys having a relatively low melting point. The method consists in pouring a melt into the rotating rolls, crystallizing it on the roll surfaces, rolling with a predetermined reduction amount, pressing out in front of the die and squeezing out the product of the predetermined configuration and dimensions through it with drawing ratio in the range of values 10-40. Analysis of technical and economic indicators showed that this method has a number of advantages in comparison with traditional technologies of semicontinuous extruding and continuous casting-rolling. So the output of a good metal at high production volumes can reach 95-97% at a productivity of up to 3-4 tons per hour. In addition, it is possible to quickly move from one profile size to another by changing the matrix. The authors proposed and patented various designs and methods for producing solid and hollow press products from non-ferrous alloys. On their basis, laboratory and pilot-industrial units for combined processing have been created, on which experimental studies have been carried out to obtain long-dimensioned deformed semi-finished products from aluminum alloys series 5xxx, 6xxx, 8xxx and others. The energy-power parameters of the process are determined and found that they are significantly smaller in comparison with traditional technologies (in 10-50 times). Investigations of the mechanical characteristics of press products have been carried out, which showed that when implementing such a treatment scheme, even when producing extruded products from low-plastic alloys, they have a high level of plastic and strength properties. Developed technologies based on the method twin roll casting-extruding now are tested in a laboratory of combined treatment methods in School of Non-ferrous Metals and Material Science in Siberian federal university and industrial conditions of a number of metallurgical plants.

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