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Aerospace Engineering-mat > Ferrous Metals > Flashcards

Ferrous Metals Flashcards

1
Q

Why steel ? (3)

A

Low cost, high density and high yield strength

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2
Q

What is good about stainless steel?

A

Corrosion resistance

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3
Q

Does steel need a lot of energy to produce

A

no

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4
Q

Is steel easy to recycle?

A

yes

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5
Q

Properties of alpha iron (ferrite)- structure

A

bcc

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6
Q

Properties of alpha iron (ferrite)- hardness

A

soft

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7
Q

Properties of alpha iron (ferrite)- amount of carbon

A

less than 2%

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8
Q

Properties of alpha iron (ferrite)- Ferromagnetic?

A

yes up to 1043K

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9
Q

Properties of Fe3C (cementite)- structure

A

orthorhombic

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10
Q

Properties of Fe3C (cementite)- strength

A

hard

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11
Q

Properties of Fe3C (cementite)- ferromagnetic

A

yes but lower temp then alpha

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12
Q

Properties of gamma iron (austenite)- structure

A

fcc

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13
Q

Properties of gamma-iron (austenite)- when present

A

high temp phase

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14
Q

What is eutectoid

A

At this point the iron will turn into 100 % pearlite

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15
Q

what is pearlite

A

Layers of alpha and cementite

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16
Q

Hypoeutectoid- forms?

A

low carbon matrix is alpha

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17
Q

Hypereutectoid- forms?

A

more carbon- matrix is cermentite

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18
Q

Why is pearlite good properties wise?

A

Because it is strong and malleable

19
Q

What happens if we cool the iron really fast

A

Martensite or Bainite is formed

20
Q

Structure of martensite

A

fcc but with carbon stretching the structure so no longer cubic

21
Q

Why do we not just try and get properties we want from fast cool in one go?

A

difficult to control, so quench and then temper to change properties

22
Q

What is good about martensite?

A

really big tensile strength

23
Q

How does increasing tempering temperature effect material

A

reduces amount of martensite so more malleable

24
Q

What happens with higher carbon steels in the phase diagram

A

Graphite is also formed

25
Q

Grey iron- what?

A

Graphite flakes in ferrite matrix

26
Q

Grey iron- properties(3)

A

hard, brittle, wear resistant

27
Q

Ductile iron- what?

A

Graphite nodules in ferrite matrix

28
Q

Ductile iron properties(2)

A

strong, ductile

29
Q

White iron- what?

A

Cementite and Pearlite

30
Q

White iron- properties(3)

A

Brittle, compressive strength, wear resistance

31
Q

Malleable iron- what?

A

Graphite rosettes in a ferrite matrix

32
Q

Malleable iron- properties(1)

33
Q

Compacted graphite iron- what?

A

Graphite particles in a ferrite matrix

34
Q

Compacted graphite iron- properties

A

Grey iron but more strength and ductility

35
Q

Effect of Chromium(3)

A 
Hardness Y
Toughness Y
Wear resistance Y
Resistance of strain and shocks
Heat resistance
Corrosion
Strength
36
Q

Effect of Cobalt

A 
Hardness 
Toughness 
Wear resistance 
Resistance of strain and shocks
Heat resistance Y - used for cutting tools
Corrosion
Strength
37
Q

Effect of Manganese

A 
Hardness Y
Toughness 
Wear resistance 
Resistance of strain and shocks Y
Heat resistance
Corrosion
Strength Y
38
Q

Effect of Molybdenum

A 
Hardness 
Toughness 
Wear resistance 
Resistance of strain and shocks Y
Heat resistance Y
Corrosion
Strength Y
39
Q

Effect of Nickel

A 
Hardness 
Toughness Y
Wear resistance 
Resistance of strain and shocks
Heat resistance
Corrosion Y
StrengthY
40
Q

Effect of Tungsten

A 
Hardness Y
Toughness 
Wear resistance 
Resistance of strain and shocks Y- improves grain structure
Heat resistance Y
Corrosion
Strength
41
Q

Effects of Vanadium

A 
Hardness 
Toughness Y
Wear resistance 
Resistance of strain and shocks Y
Heat resistance
Corrosion Y
Strength Y
42
Q

Effects of Chromium- Vanadium

A 
Hardness 
Toughness
Wear resistance 
Resistance of strain and shocks
Heat resistance
Corrosion
Strength- Y but hard to bend and cut
43
Q

How much CR does stainless steel have

A

More then 12%

Aerospace Engineering-mat (8 decks)

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