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Unformatted text preview: MSE 230 QUIZ # 4 (30 pts) ' 10 min Name: Ker/l Score: (1) (7 pts) Consider an alloy containing 0.4 wt% C that is held at 1200 °C for 2 hours
and then cooled slowly to 650 °C. What wt% of the resulting microstructure will be pro-eutectoid a—ferrite?
KWA M (v 7’: #45 ‘2': (3”30 Z
[email protected] W%%/rz>m( wow (2) (7 pts) Consider an alloy at the eutectoid composition that is held at 1000 °C for 2
hours and then cooled slowly to 650 °C. What wt% of the alloy will be cementite (F63C)?
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Wﬂ CéC’Q (3) (7 pts) Consider an alloy containing 1.5 wt% C that is cooled slowly from 1200 °C to
room temperature. Please draw the resulting microstructure in the circle provided
below. You must label the phases present or otherwise clearly indicate them. z%m%g~ﬂa¢kaém%
a/We. Vlad/vi 19%
gzoeprw/ 53c Wm ,/ (4) (8 pts) Determine the final microstructural constituents for all 6 different heat-treatments for
the time-temperature—transformation diagram given below and rank the hardness of the
microstructures that you find (lowest to highest). - Furnace cooling COQCCe - Air cooling - Austempering barge - Martempering marmav'fg,
- Oil quench ﬁW¢W¥5 - Water quench WWW at ﬁbre/Mac; ,’ ﬂarm'ﬁ > Eyre/M l/anéma'ﬁ > ﬁst/241% 7 51¢
Fear/#9, Transformation Start Transformation Finish T
E Furnace Cool
E 'Air Cool
U a ,_ it , a
MW- .- NW...“ mm m-.. m . Mme WWW" _.,,_._ _ WW m- M f Wafey,0u’ench ' Oil Quench Martempering LOG ~ TIME ...
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This note was uploaded on 04/03/2012 for the course MSE 230 taught by Professor Trice during the Spring '08 term at Purdue.
- Spring '08