IMOS EXAM 2.0 Questions And Answers| Graded A
Why transition from bronze age to iron age? Correct Answer: 1. Growing scarcity
of copper and tin
2. Increased processing temperatures
Forging Correct Answer: shaping metal by heating and hammering/beating
Casting Correct Answer: Pouring a liquid into a mold
Forms of iron from least carbon to most Correct Answer: Wrought iron, steel, cast
iron/pig iron
Wrought iron (paper clip) Correct Answer: 0-0.2% carbon
soft, malleable, easily wrought
highest melting point (>1500 degC)
bloomery
Steel (bobby pin) Correct Answer: 0.2-2.1% carbon
very strong, hard, forgable
properties depend on how fast you cool it
1000X harder than pure Fe
high melting point (>1400 degC)
bessemer
Cast iron, pig iron Correct Answer: 2.3-4.3% carbon
low melting point, not forgable
brittle
can only be cast
blast furnace
Iron phase diagram Correct Answer: where the second line from the top has a
sharp point or touches the top
(0.2, 2.1, 4.3)
Two phases of iron Correct Answer: Ferrite (can dissolve very little carbon
(<0.02%)
Austentite (can dissolve lots (<2.1%)
, Annealing Correct Answer: Slow cool
removes dislocations
makes material softer
quench Correct Answer: fast cool
brittle
tempering Correct Answer: heating again to move carbon around
Bloomery furnace Correct Answer: makes wrought iron
blast furnace Correct Answer: cast iron
finery forge Correct Answer: converts cast to wrought iron
caborization Correct Answer: converts wrought iron to steel
bessimer furnace Correct Answer: converts cast iron to steel
Coking Correct Answer: driving off impurities in coal
basic oxygen process (BOP) Correct Answer: used today
inject pure oxygen
add alloying agents and carbon after removing it
Challenges with aluminum Correct Answer: It's oxide is very hard to reduce
Phlogiston Correct Answer: A hypothetical substance thought to be formed when
things are burned—obsolete.
Hall-Heroult process Correct Answer: the process in which the alumina is
dissolved in the mineral cryolite and electricity is used to remove aluminum metal
precipitation hardening Correct Answer: Adding precipitates to aluminum, which
block dislocations
Cyclic Fatigue Correct Answer: Pressure cycling, small cracks
Why transition from bronze age to iron age? Correct Answer: 1. Growing scarcity
of copper and tin
2. Increased processing temperatures
Forging Correct Answer: shaping metal by heating and hammering/beating
Casting Correct Answer: Pouring a liquid into a mold
Forms of iron from least carbon to most Correct Answer: Wrought iron, steel, cast
iron/pig iron
Wrought iron (paper clip) Correct Answer: 0-0.2% carbon
soft, malleable, easily wrought
highest melting point (>1500 degC)
bloomery
Steel (bobby pin) Correct Answer: 0.2-2.1% carbon
very strong, hard, forgable
properties depend on how fast you cool it
1000X harder than pure Fe
high melting point (>1400 degC)
bessemer
Cast iron, pig iron Correct Answer: 2.3-4.3% carbon
low melting point, not forgable
brittle
can only be cast
blast furnace
Iron phase diagram Correct Answer: where the second line from the top has a
sharp point or touches the top
(0.2, 2.1, 4.3)
Two phases of iron Correct Answer: Ferrite (can dissolve very little carbon
(<0.02%)
Austentite (can dissolve lots (<2.1%)
, Annealing Correct Answer: Slow cool
removes dislocations
makes material softer
quench Correct Answer: fast cool
brittle
tempering Correct Answer: heating again to move carbon around
Bloomery furnace Correct Answer: makes wrought iron
blast furnace Correct Answer: cast iron
finery forge Correct Answer: converts cast to wrought iron
caborization Correct Answer: converts wrought iron to steel
bessimer furnace Correct Answer: converts cast iron to steel
Coking Correct Answer: driving off impurities in coal
basic oxygen process (BOP) Correct Answer: used today
inject pure oxygen
add alloying agents and carbon after removing it
Challenges with aluminum Correct Answer: It's oxide is very hard to reduce
Phlogiston Correct Answer: A hypothetical substance thought to be formed when
things are burned—obsolete.
Hall-Heroult process Correct Answer: the process in which the alumina is
dissolved in the mineral cryolite and electricity is used to remove aluminum metal
precipitation hardening Correct Answer: Adding precipitates to aluminum, which
block dislocations
Cyclic Fatigue Correct Answer: Pressure cycling, small cracks
