Research on the Rolling of AZ31 Strip Prepared by Twin Roll Casting

2009 ◽  
Vol 610-613 ◽  
pp. 844-847 ◽  
Author(s):  
Jian Wang ◽  
Bin Jiang ◽  
Pei Dao Ding ◽  
Guang Jie Huang ◽  
Fu Sheng Pan
Keyword(s):  
Thin Sheet ◽  
Rolling Process ◽  
Minimum Thickness ◽  
Small Thickness ◽  
Cast Strip ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Az31 Sheet ◽  
Conventional Rolling ◽  
Twin Roll

The AZ31 thin sheet (minimum thickness less than 1mm) was obtained by rolling the cast strip which was prepared by vertical twin roll casting in this paper. Since the absolute deformation during rolling was smaller,due to the small thickness of the strip of 3mm, the rolling of cast strip was different from the conventional rolling process. It was found that homogenizing time at 400°C for the cast strip was 4h and reduction per pass should be 8-10% for producing thinner (1-1.5mm) rolled AZ31 sheet at 350°C. Mechanical properties of the sheet were equivalent to conventional rolling sheet’s.

Microstructure and Texture of MX20 after Conventional Rolling and Rolling from Twin Rolled Cast Strip

2018 ◽  
Vol 941 ◽  
pp. 1418-1423
Author(s):  
Gerrit Kurz ◽  
Tom Petersen ◽  
Roland Hoppe ◽  
Jan Bohlen ◽  
Dietmar Letzig
Keyword(s):  
Magnesium Alloy ◽  
Rolling Process ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Internally Cooled ◽  
Twin Roll Cast ◽  
Conventional Rolling ◽  
Twin Roll ◽  
Free Magnesium ◽  
Feedstock Material

Two main impediments are currenty discussed with respect to the industrial application of magnesium sheets. First, the low formability of magnesium sheets requires many rolling passes to roll cast slabs to final gauge, which leads, second, to high costs for the production of magnesium sheets. An alternative cost-saving process chain for magnesium sheets with enhanced properties is the feedstock production by twin roll casting (TRC). In the TRC process, liquid metal proceeds from a furnace over a pipe into a crucible and then flows between a pair of counter rotating, internally cooled rolls. The metal solidifies upon touch with the cooled rolls and gets rolled to a strip. This paper refers to the comparison of the two processing routes on the example of the aluminum-free magnesium alloy MX20 (2 wt% Mn and 0.5 wt% Ca). Both kinds of production processes like casting and twin roll casting have an influence on the microstructure and texture of the feedstock material for the subsequent rolling process. The paper reports on the results of casting and twin roll casting experiments of this alloy. Furthermore, rolling trials are conducted and the deformation behavior of the sheets are presented and discussed with respect to the developed microstructures and textures. The different morphology of precipitates in the cast and twin roll cast feedstock material is used to improve the ductility of the magnesium alloy MX20.

scholarly journals Asymmetric Twin-Roll Casting of an Al-Mg-Si-Alloy

2018 ◽  
Vol 918 ◽  
pp. 48-53 ◽  
Author(s):  
Olexandr Grydin ◽  
Mykhailo Stolbchenko ◽  
Maria Bauer ◽  
Mirko Schaper
Keyword(s):  
Mechanical Properties ◽  
Casting Process ◽  
Rolling Process ◽  
Age Hardening ◽  
Process Conditions ◽  
Shear Stresses ◽  
Asymmetric Rolling ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Twin Roll

The industrial application of high-alloyed Al-Mg-Si alloys for the production of thin strips by means of twin-roll casting is limited due to the structural inhomogeneity and segregation formation. To reach the highest mechanical properties of the finished product, a direct influence on the strip formation conditions during the twin-roll casting can be applied. Analogous to the asymmetric rolling process, additional shear stresses were created in the strip forming zone by using different circumferential velocities and torques of the caster rolls. To provide the asymmetric process conditions, only one caster roll was left driven and the second one was left idling during the casting process. The microstructure and the mechanical properties of the strips in the as-cast state as well as after the homogenization and subsequent age-hardening were analyzed. A comparison of the test results showed a positive influence of the asymmetry conditions on the strips’ properties.

Texture Evolution in Non-Oriented Silicon Steel Processed by Twin-Roll Casting

2012 ◽  
Vol 452-453 ◽  
pp. 7-11 ◽  
Author(s):  
Wei Pei ◽  
Yu Hui Sha ◽  
Fang Zhang ◽  
Liang Zuo
Keyword(s):  
Cold Rolling ◽  
Texture Evolution ◽  
Casting Process ◽  
Rolling Process ◽  
Silicon Steel ◽  
Recrystallization Annealing ◽  
Twin Roll Casting ◽  
Steel Sheets ◽  
Roll Casting ◽  
Twin Roll

In this paper, non-silicon steel sheets were produced by both twin-roll casting method and conventional process. Orientation characteristics and texture evolution of the sheets during casting, cold rolling and recrystallization annealing were investigated for comparison. It was found that the subsurface of twin-roll casting strips are characterized by weak {100} orientation while the central layer by random orientation. Twin-roll casting process can decrease α fiber (//RD) and increase γ fiber (//ND) during cold rolling process. Consequently, the η fiber (//RD) favorable for magnetic properties of non-silicon steels is enhanced and the detrimental {111} component is suppressed after annealing.

Solidification Microstructure and Mechanical Properties of Hot Rolled and Annealed Mg Sheet Produced through Twin Roll Casting Route

2011 ◽  
Vol 690 ◽  
pp. 331-334 ◽  
Author(s):  
M. Aljarrah ◽  
Elhachmi Essadiqi ◽  
D.H. Kang ◽  
In Ho Jung
Keyword(s):  
Mechanical Properties ◽  
Fuel Efficiency ◽  
Direct Chill ◽  
Alloy Sheet ◽  
Process Conditions ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Average Grain Size ◽  
Az31 Sheet ◽  
Twin Roll

The use of wrought magnesium for automobile structural components is an important component of the mass reduction strategy for automobiles to improve their fuel efficiency. Compared to Direct chill casting, Twin Roll Casting (TRC) allows major reduction of hot rolling steps in the production of Mg sheet due to the thin thickness of the as-cast strip. This TRC route can substantially reduce the time and cost to produce Mg alloy sheet product. In this work, AZ31 magnesium alloy was casted to 5 and 6 mm thick strips under different process conditions. Microstructure of these strips was analyzed using optical microscopy, SEM and EPMA. TRC strip was annealed under two different conditions: 2 hours at 330 and 1 hour at 400°C. It has been found that heat treatment at 400°C for 1 hour reduces centerline segregation significantly. TRC strips were rolled down to 2 mm and annealed at 450°C for 2 minutes. The average grain size was 4-6 µm and mechanical properties were comparable with commercial AZ31 sheet.

scholarly journals Analysis of twin-roll casting AA8079 alloy 6.35-μm foil rolling process

2016 ◽  
Vol 50 (6) ◽  
pp. 861-868 ◽  
Author(s):  
Ahmet Can ◽  
Hüseyin Arikan ◽  
Kadir Çinar
Keyword(s):  
Rolling Process ◽  
Twin Roll Casting ◽  
Foil Rolling ◽  
Roll Casting ◽  
Twin Roll

Properties of AZ31 and AZ91 Sheets Made by Twin Roll Casting

2007 ◽  
Vol 539-543 ◽  
pp. 1650-1655 ◽  
Author(s):  
Masatada Numano ◽  
Nobuyuki Mori ◽  
Yoshihiro Nakai ◽  
Nozomu Kawabe
Keyword(s):  
Tensile Strength ◽  
Rolling Process ◽  
Alloy Sheet ◽  
Equiaxed Dendrite ◽  
Roll Casting ◽  
Finish Rolling ◽  
Az31 Sheet ◽  
The Press ◽  
Twin Roll ◽  
Press Formability

A feasibility study has been made to produce the Mg alloy sheet of high tensile strength and formability by strip casting and an optimized rolling process. 4mm thickness AZ31 and AZ91 strips were cast successfully. While the microstructure of the cast AZ31 strip consisted of columnar zones, the cast AZ91 strip consisted of fine, equiaxed dendrite and fine precipitations. All samples were rolled to 0.5 mm thickness using an optimized finish-rolling schedule, and their grain size was around 4μm. The ultimate tensile strength (UTS), yield strength (YS) (0.2% offset) and elongation (EL) of the rolled AZ31 sheet were higher than those of commercial AZ31B sheet, and the UTS and YS of the rolled AZ91 sheet were 30% higher than commercial AZ31B sheet. The press formability of the rolled AZ31 and AZ91 sheet was equal or superior to commercial AZ31B sheet.

scholarly journals Study of the Mechanical Properties of Strips Obtained in TRC Line

2016 ◽  
Vol 61 (2) ◽  
pp. 1101-1108 ◽  
Author(s):  
A. Mamala ◽  
W. Ściężor ◽  
P. Kwaśniewski ◽  
J. Grzebinoga ◽  
R. Kowal
Keyword(s):  
Mechanical Properties ◽  
Chemical Composition ◽  
Cold Rolling ◽  
Rolling Process ◽  
Twin Roll Casting ◽  
Integrated Method ◽  
Casting Technology ◽  
Roll Casting ◽  
Processing Line ◽  
Twin Roll

Abstract Twin Roll Casting technology belongs to modern, integrated method of processing aluminum and its alloys. This method includes preparation of liquid metal and its continuous casting between the rotating cylindrical crystallizers, optional homogenizing treatment, cold rolling and optional interoperation or final heat treatment. Final products of TRC method are strips with a thickness from few to several millimeters, which can be directly subjected to cold rolling process to afford a sheet. Properties of final product are limited by the material’s condition, its chemical composition and also selected path of its processing technology. The paper presents research results of chemical composition and mechanical properties of strips obtained in Twin Roll Casting processing line.

Experimental Study of In-Line Heat Treatment for Twin Roll Casting of Magnesium Alloy AZ31

2006 ◽  
Vol 15-17 ◽  
pp. 513-518 ◽  
Author(s):  
Dong Ying Ju ◽  
Xiao Dong Hu ◽  
Hong Yang Zhao
Keyword(s):  
Heat Treatment ◽  
Magnesium Alloy ◽  
Alloy Sheet ◽  
Cast Strip ◽  
Twin Roll Casting ◽  
Coarse Dendrite ◽  
Good Surface ◽  
Roll Casting ◽  
Oil Tank ◽  
Twin Roll

Strip casting is a promising route to directly produce magnesium alloy sheet by twin roll casting method. As-cast strips with proper microstructure and good surface quality are requested to serve as next rolling feedstock. In order to restrain the coarse dendrite growth and get uniform grain, a new method of in-line heat treatment was proposed. The as-cast strip was dipped into an oil tank after exiting the rolls and then was quenched with oil at various temperatures. The effect of oil temperature, casting speed and pouring temperature on microstructure and mechanical properties of cast strip was investigated.

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