Process parameters and roll separation force in horizontal twin roll casting of aluminum alloys

2015 ◽  
Vol 218 ◽  
pp. 48-56 ◽  
Author(s):  
Yun-Soo Lee ◽  
Hyoung-Wook Kim ◽  
Jae-Hyung Cho
Keyword(s):  
Aluminum Alloys ◽  
Process Parameters ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Separation Force ◽  
Twin Roll

scholarly journals Analysis of Thermal Stress during of Twin-Roll Casting of Magnesium Alloy

2012 ◽  
Vol 217-219 ◽  
pp. 1928-1933
Author(s):  
Yu Cheng Zhang ◽  
Tian Yang Han ◽  
Zheng Yi Jiang ◽  
Dong Bin Wei
Keyword(s):  
Numerical Simulation ◽  
Thermal Stress ◽  
Magnesium Alloy ◽  
Process Parameters ◽  
Element Model ◽  
Spray Angle ◽  
Thermal Cracks ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Twin Roll

The process of twin-roll casting including pouring, solidifying, rolling and cooling can be accomplished in a very short time. Consequently, some important process parameters in the twin-roll casting that are difficult to be obtained in experiment can be acquired using numerical simulation. In this paper, a numerical simulation based on a 2D finite element model of vertical twin-roll strip casting of magnesium alloy has been conducted, and the thermal stress fields are significantly discussed. The influences of key process parameters consisting of submerged nozzle depth and nozzle spray angle have been studied. The thermal cracks on the surface of the strip are analysed according to the thermal stress distribution.

scholarly journals Effect of Casting Parameters on Roll Separation Force during Twin Roll Casting

2014 ◽  
Vol 81 ◽  
pp. 1547-1552 ◽  
Author(s):  
Yun-Soo Lee ◽  
Hyoung-Wook Kim ◽  
Jae-Hyung Cho
Keyword(s):  
Twin Roll Casting ◽  
Roll Casting ◽  
Separation Force ◽  
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.

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