Interpreting the Microstructure of Steels

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Interpreting the Microstructure 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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AllotriomorpicIdiomorphicferrite
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Pearlite
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Initiation of pearlite (Howell)
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20 µm
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Jaramillo et al., 2004
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Spheroidisation
Ferrer et al., 2005
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Martensite
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s
d
c
r
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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upper bainite
1 µm
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lower bainite
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Surface 1
Surface 2
50 µm
Srinivasan Wayman, 1968
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DISPLACIVE
RECONSTRUCTIVE
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Widmanstättenferrite
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Watson and McDougall, 1973
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More mixed microstructures
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Thermal etching
Peet, 2005
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Thermal grooves, Chatterjee, 2005