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