Design of TRIP-Assisted Steels for Automobiles. Microstructure has been extensively studied...
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Design of TRIP-Assisted Steels for Automobiles
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• Microstructure has been extensively studied
• Microstructure understood: most aspects can be calculated
• Mechanical properties cannot be calculated
• Mechanical properties badly related to microstructure
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Bhadeshia & Edmonds, (1980)
Typical composition:
Fe-0.15C-1.5Si-1.5Mn wt%
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Bhadeshia & Edmonds, (1980)
b
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Swallow & Bhadeshia, 1996
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engineering strain
engi
neer
ing
stre
ss /
MP
a
Mizui et al. (1997)
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Jacques et al. (2001)
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Ro et al. (1994)
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transformation-induced plasticity
50 m
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s
1
s
1
1
uniaxial dilatation
simple shear
general invariant-plane
strain
s=0.26
=0.03
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c
r
s
1
Transformation is a deformation on habit plane
Can be induced by stress
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Bhadeshia, 1982
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50 m
polycrystalline austenite
Bhadeshia, 1982
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sz3
z1
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u v
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Sakuma et al. (1991)
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abso
rbed
ene
rgy
/ kJ
Yoshitake et al. (1996)
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Bhadeshia & Edmonds, (1980)
Composite of soft and hard phase
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Bhadeshia & Edmonds, (1980)
strain in soft phase
Str
ain
in h
ard
phas
e
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Tomota (1976)
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Bhadeshia & Edmonds, (1980)
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Chester and Bhadeshia, 1997
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Chester and Bhadeshia, 1997
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Chester and Bhadeshia, 1997
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Chester and Bhadeshia, 1997
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low silicon high silicon
Jacques et al. (2001)
silicon causes scale
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Summary
• Assistance from TRIP is less than 1.4% of total strain
• Emphasis could be shifted from retained austenite to studies of composite deformation
• Low silicon steels can perform well (Jacques)