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7/29/2019 Steel Microstructure
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Interpreting theMicrostructure of Steels
www.msm.cam.ac.uk/phase-trans
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austenite
ferrite
cementite
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DISPLACIVE
RECONSTRUCTIVE
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Allotriomorpic
Idiomorphic
ferrite
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Pearlite
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20 m
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Jaramillo et al., 2004
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Ferrer et al., 2005
Spheroidisation
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Martensite
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50 mm
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c
r
s
1
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austenite
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Chang and Bhadeshia
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transformation twins (Wayman)
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Bainite
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1 m
upperbainite
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lowerbainite
S f 1 S f 2
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Surface 1 Surface 2
Srinivasan & Wayman, 196850 m
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DISPLACIVE
RECONSTRUCTIVE
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Widm nsttt n
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Widmanstttenferrite
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Watson and McDougall, 1973
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More mixedmicrostructures
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100 m
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Peet, 2005
Thermal etching
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Thermal grooves,Chatterjee, 2005