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The three photograph above show the fracture surfaces of Charpy impact
test samples of a low carbon steel. The left hand sample was tested at
-200 C, the center sample at +20 C, and the right hand sample at + 200
C. At the low temperature the behavior is brittle, and at the other two
temperatures the behavior is ductile. Microscopic examination of the fracture
surfaces shows transgranular cleavage at the lowest temperature and ductile
microvoid coalesence at the two higher temperatures. Large shear lips are
seen on the high temperature samples.
From:
Manchester Materials Science Center,
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