Download - M C T R C
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MC-TRCMelt conditioned twin roll casting
MC-TRCMelt conditioned twin roll casting
Z BCAST (Brunel Centre for Advanced Solidification Technology)
Brunel University
UK
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Introduction
Key challenges in the development of twin roll casting (TRC) include elimination of central line segregation, increasing cast speed, increasing the range of twin roll castable alloys.
MC-TRC=TRC+MCAST
Melt conditioned alloy melt contains well dispersed oxide particles which enhances heterogeneous nucleation
Enhanced nucleation allows fully equiaxed solidification
Fine and equiaxed grains reduces/eliminates central line segregation
All these will increase casting speed and enlarge the ranges of twin roll castable alloys.
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MC-TRC ProcessMC-TRC Process
Melt Conditioned Twin Roll Casting Process
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Microstructure of TRC Al-alloy strip
Microstructure of TRC Al-alloy strip
TL
TRC
5754 (0.4%Fe)
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MicrostructureMicrostructure
TL
MC-TRC + GR
5754 (0.4%Fe)
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MicrostructureMicrostructure
MC-TRC
AZ31 strip, 4mm thickness, as-cast
TRC
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0.0 0.2 0.4 0.6 0.8 1.00
100
200
300
400
500
600
700 TRCMC-TRC
Gra
in s
ize
(mic
ron
)
Normalised thickness
AZ91D
0.0 0.2 0.4 0.6 0.8 1.00
100
200
300
400
500
600
700 TRCMC-TRC
Gra
in s
ize
(mic
ron
)
Normalised thickness
AZ91D
Microstructural variationMicrostructural variation
4mm AZ91D strip
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Elemental distributionElemental distribution
0.0 0.2 0.4 0.6 0.8 1.05
10152025
01234
78849096
Normalized thickness
Al
Zn
Mg,
Al a
nd Z
n co
nten
t (w
t. %
) Mg
0.0 0.2 0.4 0.6 0.8 1.05
10152025
01234
78849096
Nomorlized thickness
Al
Zn
Mg,
Al a
nd Z
n co
nten
t (w
t. %
) Mg
TRC
4mm AZ91D strip
MC-TRC
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Microstructural evolutionMicrostructural evolution
AZ31 stop sample
TRC
TRC
MC-TRC
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Solidification mechanismsSolidification mechanisms
Tip Roll
L L+S S Nip
L
L+S
S
L
L+S
S
L
L+S
S
L
L+S
S
MC-TRCTRC
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Mechanical propertiesMechanical properties
AZ91
(As-cast)
YS.
(MPa)
UTS
(MPa)
Elongation
(%)
TRC, tested at 3500C 11.0 47.0 43.4
MC-TRC, tested at 3500C 8.5 38.5 118.1
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Mechanical propertiesMechanical properties
AZ31
(Rolled)
YS.
(MPa)
UTS
(MPa)
Elongation
(%)
TRC, Rolled at 4000C 181.6±4.3 243.1±6.1 9.6±1.6
MC-TRC, Rolled at 4000C 177.7±8.0 251.1±5.2 27.7±5.2
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Advantages of MC-TRC over TRC
Increased melt fluidity, reduced sensitivity to processing conditions
Fine and uniform microstructure through the strip thickness
Eliminated/reduced central line segregation
Increased casting speed
Increased tolerance to impurity elements and inclusions
Enlarged twin roll castable alloy range
Increased deformability
Enhanced mechanical properties
Applicable to both Al-alloys and Mg-alloys