Chapter 2 Flashcards
True or False:
Steels and cast irons can also contain other alloying elements besides carbon
True
Occurs with high friction or speed.
surface cracking
True or False:
Metals conduct heat better than ceramics or polymers
True
The pure properties of this alloy are ductile, malleable,good electrical / thermal conductor and very soft
copper alloys
Special grades of alloy steels used for a variety of tooling, with very close control of the alloying element additions
tool steels
___ refers to heating and soaking metal at suitable temperature for a certain time, and slowly cooling
Annealing
Cross section of a round rod / wire is reduced by pulling it through a die.
drawing
Deformation that occurs under constant temperature
Isothermal forming
___ is the resistance to sliding along an interface
Friction
Also called noble metals because chemically inert
precious metals
Starting form of casting
cast
It is so-called for having high-performance alloys for strength and resistance to surface degradation at high service temperatures
superalloys
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
tungsten
Plastic deformation below the recrystallization temperature
cold working
A hollow ram pushes the die back through a stationary, confined billet
indirect extrusion
True or False:
The usage of lubricants in metal forming can decrease the force or power requirements
True
True or False:
Wrought metal is the metal that has been worked or can be worked before casting
False
Heated billet is fed into the gap between two large, convex-tapered rolls and forces the billet to deform into a rotating ellipse
piercing
Primarily selected to reduce friction and tool wear, but may be used as a thermal barrier, coolant, or corrosion retardant
lubrication
___ is a mixture or compound of two or more elements, at least one of which is metallic.
Alloy
High-pressure fluid surrounds the workpiece and applies the force to execute extrusion
hydrostatic extrusion
True or False:
Heat treating is done to enhance properties of metals
True
Large increase in hardenability with very small addition of element
boron
True or False:
In cold working, heavier and more powerful equipment and stronger tooling are required
True
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
Metals capable of enduring high temperatures - maintaining high strength and hardness at elevated temperatures
refractory metals
True or False:
Tin-lead alloys melt at lower temperatures that’s why it is considered to be in eutectic composition
True
High strength aircraft structures
aluminum alloys
True or False:
Ferrous, non ferrous and alloys are the classification of metals
False
Designated as cold when combined with other forging operations. This is also called as impact extrusion
Cold extrusion
True or False:
Steel and cast iron belong to non ferrous metals
False
True or False:
Force or power requirements belongs to dependent variables in metal forming
True
The phase at room temperature is alpha called
ferrite
True or False:
In metals, as the carbon content increases, the tensile strength also increases.
True
Metals whose major element is not Iron
Non – ferrous metals
It is similar to heating and soaking cycle as in full annealing, but faster cooling rates.
Normalizing
The pure metal properties of this alloy are lightweight,strong (per unit volume) and flammable in fine sizes
magnesium alloys
Plastic deformation of metals at a temperature above the recrystallization temperature
hot working
Metal is compressed and forced to flow through a shaped die to form a product with a constant cross section
extrusion
True or False:
Most engineering applications require the enhanced properties obtained by alloying
True
True or False:
In metals, as the carbon content increases, the percentage of elongation also increases.
False
capacity to absorb energy better than other classes of materials
toughness
Deformations produced at temperatures intermediate to cold and hot working
warm working
It is the ability of a material to flow as a solid without deterioration of properties
plasticity
It is used to describe it because its chemical composition is intermediate between two phases
intermediate phase
