Engineering Board Exam Reviewer · Engineering Materials · hard
A 0.40% C steel is slowly cooled to just below 727 °C. What is the mass fraction of pearlite? (Use 0.022% C for ferrite and 0.76% C for the eutectoid.)
- 0.526
- 0.488
- 0.512
- 0.060
Answer
C. 0.512
Solution
Lever rule: Wp = (C0 - 0.022)/(0.76 - 0.022) = 0.378/0.738 = 0.512.
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