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MMET Lecture 5

QuestionAnswer
What is martensite? BCT, not on the equilibrium diagram, starting phase needs to be FCC/BCC, then quenched to be formed
What are the stable phases of steel? Ferrite, austenite, & cementite
What is ferrite (F)? BCC iron w/ carbon in solid solution. Soft, ductile, magnetic
What is austenite (A)? FCC iron w/ carbon in solid solution. Soft, moderate strength, nonmagnetic, above AC_3
What is cementite (C)? Compound of iron & carbon Fe_3C. Hard & brittle
Order of phases from lowest to highest? Ferrite -> Iron-carbide -> Pearlite (P) -> Iron-carbide
Order of phases from lowest to highest carbon content? 100% F (~pure iron) -> P + F -> 100% P (eutectoid) -> Iron-carbide + pearlite (rivers of C)
What is the tensile strength of 100% F? 40 ksi
What is the tensile strength of 100% P? 120 ksi
How much carbon does P have? 0.8% or 8 pts
What is pearlite? BCC
What happens when you heat up F + P? Becomes F + P + A, then big grains form = bad
What happens when you heat up F + P, then cool it down? Big grains stay
List heat treating processes: Full annealing, hardening, tempering, stress relieving, spheroidizing, austempering, & martempering
Which heat treating processes go above the AC_3 line? Full annealing, hardening, austempering, & martempering
Which heat treating processes go below the AC_3 line? Tempering, stress relieving, spheroidizing
Steels having GREATER than the eutectoid amount of carbon (0.8%) are called hypereutectoid steels. True
Steels containing THE eutectoid amount of carbon (0.8%) are 100% pearlite. True
Steels having LESS than the eutectoid amount of carbon (0.8%) are called hypoeutectoid steels. True
There are 4 single-phase solids found on the Fe-Fe3C equilibrium diagram. Three of these occur in pure iron and the fourth is iron carbide intermetallic. The iron carbide intermetallic is also known as? Cementite
During cooling, the Curie point is the temperature that the iron undergoes an atomic level transition (not a phase change) and gains magnetism? True
What is a single phase solid that assumes a face-centered-cubic structure? Austenite
Iron wants to change crystal structure from FCC (austenite) to BCC (ferrite), but the ferrite can only contain 2 points carbon in solid solution. The excess carbon forms iron carbide, which is also called cementite. True
A hypoeutectoid steel with .4% (40 points) carbon is 50% Pearlite & 50% Ferrite. True
Heating steel with 0.8% carbon above the AC3 line, held for 1 hour at temperature and allowed to slowly cool in the furnace will result in the formation of _ at room temperature? Pearlite
A hypereutectoid steel containing 0.9% carbon is heated to 1250F, allowed to soak for 1 hour, then rapidly cooled using an oil quench will form martensite at room temperature. True
What is an interstitial atom? Small solute atoms located between atoms of host metal
What is an substitutional atom? Larger solute atoms displacing atoms of host atoms
Created by: Texi Rae
 

 



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