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Chapter 9_Part_11

# Chapter 9_Part_11 - Microstructure of hypereutectoid steel...

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51 MSE 2090: Introduction to Materials Science Chapter 9, Phase Diagrams Microstructure of hypereutectoid steel

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52 MSE 2090: Introduction to Materials Science Chapter 9, Phase Diagrams Hypereutectoid alloys contain proeutectoid cementite (formed above the eutectoid temperature) plus perlite that contain eutectoid ferrite and cementite. Microstructure of hypereutectoid steel (II)
53 MSE 2090: Introduction to Materials Science Chapter 9, Phase Diagrams How to calculate the relative amounts of proeutectoid phase ( α or Fe 3 C) and pearlite? Application of the lever rule with tie line that extends from the eutectoid composition (0.75 wt% C) to α – ( α + Fe 3 C) boundary (0.022 wt% C) for hypoeutectoid alloys and to ( α + Fe 3 C) – Fe 3 C boundary (6.7 wt% C) for hipereutectoid alloys . Fraction of α phase is determined by application of the lever rule across the entire ( α + Fe 3 C) phase field.

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54 MSE 2090: Introduction to Materials Science Chapter 9, Phase Diagrams Example for hypereutectoid alloy with composition C 1 Fraction of pearlite: W P = X / (V+X) = (6.7 – C 1 ) / (6.7 – 0.76)
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Chapter 9_Part_11 - Microstructure of hypereutectoid steel...

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