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materials > metals 2 > Flashcards

metals 2 Flashcards

1
Q

what is heat treatment of steel?

A

when steel in heat to resolve its crystal structure and grains

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2
Q

what are the 6 heat treatment methods?

A 
Full annealing 
Normalising
Process annealing
Hardening
Quenching
Tempering
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3
Q

what is full annealing?

A

when steel is heated to gamma and cooled slowly

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4
Q

what is normalising?

A

when steel is heated to gamma and cooled in the air (quick)

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5
Q

what is quenching?

A

when steel is heated to gamma and cooled in water or oil

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6
Q

what is tempering?

A

after quenching the steel is reheated

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7
Q

what is work hardening?

A

when steel is loaded until it reaches its yield point, the low is then taken off and then it reloaded again ( 2nd yield point is higher)

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8
Q

what is produced after quenching?

A

martensite

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9
Q

what are the different types of iron, and how carbon do they contain?

A

pig iron- 3.5-4.5%
wrought iron- 0.02-0.25%
cast iron- 2-5%
molten iron- (melted pig iron)

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10
Q

what are carbon steel and alloy steel?

A

carbon steel- contains steel and carbon

alloy steel- contains steel, carbon and other impurities

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11
Q

describe the process of manufacturing iron?

A

take raw iron (iron oxide) from ironstone
melt to 1535 degree
add coke (to produce carbon)
add limestone (to remove impurities)

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12
Q

describe the process of manufacturing cast iron?

A

molten iron from furnace poured into moulds

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13
Q

describe the process of manufacturing wrought iron?

A

reheating pig iron at 800-900 degrees and hammering and folding it repeatedly

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14
Q

describe the process of manufacturing steel?

A

iron oxide+ coke+ limestone+ pure air/ oxygen

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15
Q

what are the three categories of steel shapes?

A

slabs, blooms and billets

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16
Q

what are the characteristic of high carbon steel?

A

(>0.7%) hard, strong and brittle

17
Q

what are the characteristic of low carbon steel?

A

(<0.3%)soft, tough and ductile

18
Q

describe the two ways of shaping steel

A

hot working: pressing while hot (less accurate)

cold working: pressing in room temperature (more accurate)

materials (10 decks)

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