quiz 4 solution

# quiz 4 solution - 106 04 146 3 3 3 = − = − = id...

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Name: Solution __ - 1 - MSE 230 (Spring 2008) Quiz #4 (30 pts) 1.(24 pts) The following question deals with the phase diagram of steel with 1.0 wt.% carbon that has been cooled to 700°C . (2 pts) a. At 700°C, the maximum solubility of carbon (C) in iron (Fe) is approximately ___0.022_ _____ wt. % C. (2 pts) b. What is the proeutectoid phase for this alloy? Fe 3 C (i.e. cementite) (4 pts) c. In the circles provided, make a sketch of the expected microstructure at 700°C, labeling the phases present.

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Name: Solution __ - 2 - (4 pts) d. What weight fraction of proeutectoid Fe 3 C phase would you observe? 04 . 0 76 . 0 7 . 6 76 . 0 0 . 1 3 = = id proeutecto C Fe W (4 pts) e. What weight fraction of total Fe 3 C would you observe? 146 . 0 022 . 0 7 . 6 022 . 0 0 . 1 3 = = total C Fe W (4 pts) f. What weight fraction of eutectoid Fe 3 C would you observe?
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Unformatted text preview: 106 . 04 . 146 . 3 3 3 = − = − = id proeutecto C Fe W total C Fe W eutectoid C Fe W (4 pts) g. What weight fraction of eutectoid pearlite would you observe in the eutectoid microstructure? (Hint: The eutectoid microstructure includes proeutectoid Fe 3 C phase a n d eutectoid pearlite ) 96 . 04 . 1 3 1 96 . 76 . 7 . 6 . 1 7 . 6 = − = − = = − − = id proeutecto C Fe W eutectoid pearlite W or eutectoid pearlite W 2. (6 pts) True or False The process of a phase transformation may be broken down into two distinct stages: nucleation and growth. (True / False) The microstructure of Bainite consists of ferrite ( α-Fe) and cementite (Fe 3 C) phases. (True / False)...
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quiz 4 solution - 106 04 146 3 3 3 = − = − = id...

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