Chapter 2 Flashcards

1
Q

True or False:

Steels and cast irons can also contain other alloying elements besides carbon

A

True

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2
Q

Occurs with high friction or speed.

A

surface cracking

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3
Q

True or False:

Metals conduct heat better than ceramics or polymers

A

True

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4
Q

The pure properties of this alloy are ductile, malleable,good electrical / thermal conductor and very soft

A

copper alloys

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5
Q

Special grades of alloy steels used for a variety of tooling, with very close control of the alloying element additions

A

tool steels

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6
Q

___ refers to heating and soaking metal at suitable temperature for a certain time, and slowly cooling

A

Annealing

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7
Q

Cross section of a round rod / wire is reduced by pulling it through a die.

A

drawing

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8
Q

Deformation that occurs under constant temperature

A

Isothermal forming

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9
Q

___ is the resistance to sliding along an interface

A

Friction

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10
Q

Also called noble metals because chemically inert

A

precious metals

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11
Q

Starting form of casting

A

cast

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12
Q

It is so-called for having high-performance alloys for strength and resistance to surface degradation at high service temperatures

A

superalloys

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13
Q

Remarkable metal for it has the highest melting point among metals, one of the densest, also the stiffest (highest modulus of elasticity) and hardest of all pure metals

A

tungsten

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14
Q

Plastic deformation below the recrystallization temperature

A

cold working

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15
Q

A hollow ram pushes the die back through a stationary, confined billet

A

indirect extrusion

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16
Q

True or False:

The usage of lubricants in metal forming can decrease the force or power requirements

A

True

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17
Q

True or False:

Wrought metal is the metal that has been worked or can be worked before casting

A

False

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18
Q

Heated billet is fed into the gap between two large, convex-tapered rolls and forces the billet to deform into a rotating ellipse

A

piercing

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19
Q

Primarily selected to reduce friction and tool wear, but may be used as a thermal barrier, coolant, or corrosion retardant

A

lubrication

20
Q

___ is a mixture or compound of two or more elements, at least one of which is metallic.

21
Q

High-pressure fluid surrounds the workpiece and applies the force to execute extrusion

A

hydrostatic extrusion

22
Q

True or False:

Heat treating is done to enhance properties of metals

23
Q

Large increase in hardenability with very small addition of element

24
Q

True or False:

In cold working, heavier and more powerful equipment and stronger tooling are required

25
It can predict how a material will respond to a rolling process, fill a forging die, flow through an extrusion die, or solidify in a casting
models
26
Metals capable of enduring high temperatures - maintaining high strength and hardness at elevated temperatures
refractory metals
27
True or False: | Tin-lead alloys melt at lower temperatures that's why it is considered to be in eutectic composition
True
28
High strength aircraft structures
aluminum alloys
29
True or False: | Ferrous, non ferrous and alloys are the classification of metals
False
30
Designated as cold when combined with other forging operations. This is also called as impact extrusion
Cold extrusion
31
True or False: | Steel and cast iron belong to non ferrous metals
False
32
True or False: | Force or power requirements belongs to dependent variables in metal forming
True
33
The phase at room temperature is alpha called
ferrite
34
True or False: | In metals, as the carbon content increases, the tensile strength also increases.
True
35
Metals whose major element is not Iron
Non – ferrous metals
36
It is similar to heating and soaking cycle as in full annealing, but faster cooling rates.
Normalizing
37
The pure metal properties of this alloy are lightweight,strong (per unit volume) and flammable in fine sizes
magnesium alloys
38
Plastic deformation of metals at a temperature above the recrystallization temperature
hot working
39
Metal is compressed and forced to flow through a shaped die to form a product with a constant cross section
extrusion
40
True or False: | Most engineering applications require the enhanced properties obtained by alloying
True
41
True or False: | In metals, as the carbon content increases, the percentage of elongation also increases.
False
42
capacity to absorb energy better than other classes of materials
toughness
43
Deformations produced at temperatures intermediate to cold and hot working
warm working
44
It is the ability of a material to flow as a solid without deterioration of properties
plasticity
45
It is used to describe it because its chemical composition is intermediate between two phases
intermediate phase