Flashcards in 18. Phase Diagrams III Fe-C System Deck (14):
What wt% C is pure cementite (Fe3C) formed at?
What is the 𝛼 phase called?
What is the 𝛾 phase called?
What is the symbol for the ferrite phase?
What is the symbol for the Austentite phase?
When a liquid at the eutectic composition of iron and carbon is cooled below the eutectic point what is the substance formed?
Pearlite (a lamellar microstructure)
Is ferrite brittle or ductile?
Is cementite brittle or ductile?
How do you find the weight fraction of pearlite in the 𝛼 + Fe3C region at a non-eutectic composition?
Draw a tie line just above the eutectic isotherm to determine the weight fraction of 𝛾. The 𝛾 present here will all become pearlite.
The prefix hypo means _____
ie before the eutectic composition
The prefix hyper means ____
ie after the eutectic composition
The strength of Pearlite increases with _____ interlaminar spacing, S
Fine pearlite is ____ (weaker/stronger) than coarse pearlite