Metallurgy Flashcards
During the iron ore refining process, the main function of limestone is to?
a) increase steel hardness
b) reduce cast iron cracking
c) provide the heat required to melt the iron within the iron ore
d) combine with impurities in the molten metal and form slag
d) combine with impurities in the molten metal and form slag
a heat of steel when poured into a mold is commonly referred to as an?
a) bar
b) ingot
c) brick
d) billet
b) ingot
Of these elements common to cast iron and steel, the one that most affects hardness and strength is?
a) phosphorous
b) carbon
c) nickel
d) molybdenum
b) carbon
The percentage of the element carbon together with iron will determine?
a) the hardness of steel
b) whether the outcome product is cast iron or cast steel
c) the alloy content of the outcome prodcut
d) both A & C
whether the outcome product is cast iron or cast steel
Carbon levels for cast iron are typically?
a) 0.02-0.25%
b )0.25-.050%
c) 0.5-2.00%
d) 2.00-4.00%
d) 2.00-4.00%
Carbon levels for medium carbon steel are typically?
a) 0.02- 0.25%
b) 0.25-0.50%
c) 0.50-2.00%
d) 2.00-4.00%
b) 0.25-0.50%
Alloy agents are mixed with steels to?
a) reduce steel costs
b) improve the steel physical properties
c) provide case hardening
d) reduce inclusion quantities
b) improve the steel physical properties
The harness rating system that measure the depth of an indentation through testing is?
a) Brinnell system
b) Rockwell system
c) ball rebound hardness test
d) combination of both brinnell and rockwell
b) Rockwell system
The Rockwell rating that shows the highest hardness is?
a) Rc33
b) Rc43
c) Rc53
d) Rc63
d) Rc63
Toughness is?
a) the metal ability to resist denting by a blow
b) improved by making parts softer
c) improved by making parts harder
d) a parts ability to absorb high energy without breaking
d) a parts ability to absorb high energy without breaking
parts possessing ductility
a) can absorb high energy without fracturing
b) are fractured easily when struck
c) are dented easily
d) can tolerate twisting and stretching
d) can tolerate twisting and stretching
Yield strength is?
a) the stretching of a part beyond its plastic range
b) a parts ability to carry a load without permanent stretching
c) the bending the beyond its yield strength
d) ability to carry high load without breaking
b) a parts ability to carry a load without permanent stretching
Fatigue strength is?
a) a parts ability to endure repeated load cycles without breaking
b) Testing parts endurance
c) a parts ability to carry load without permanent stretching
d) a parts ability to endure stress without breaking
a) a parts ability to endure repeated load cycles without breaking
Cast steel is?
a) resistant to shock load
b) stronger then cast iron
c) is easily welded
d) all of the above answers
d) all of the above answers
The primary purpose for rolling an ingot is to?
a) form steel into a shape such as a billet or plate
b) flatten a piece of steel
c) make steel stronger and tougher
d) relieve internal stresses
c) make steel stronger and tougher
Forged steel parts?
a) have random internal grain structure
b) have a low tensile strength
c) are usually forged at room temps
d) are cost effective because parts are manufactured relatively easily
d) are cost effective because parts are manufactured relatively easily
Powder mettallurgy is a metal forming process in which?
a) metal powders are compacted into shape and then sintered
b) parts do not require closes tolerances
c) metal is heated and hammered into
d) metal powders are melted, poured into a mold and sintered
a) metal powders are compacted into shape and then sintered
The extrusion process results in manufactured parts that are?
a) case hardened
b) harder on the outside and tougher in the middle
c) highly finished and tougher
d) relieved of internal stress
c) highly finished and tougher
The correct sequence of a typical heat treatment process is?
a) tempering, austenitizing and quenching
b) Austenitizing, quenching, tempering
b) Austenitizing, quenching, tempering
The temperature at which changes in the cell structure of plain steel begin to occur is about?
a) 875 F
b) 1400 F
c) 1550 F
d) 1660 f
b) 1400 F
During the austenitizing proccess?
a) carbon atoms enter FCC structure if enough time and temperature are provided
b) the parts must be through heated
c) the part must be heated to the upper critical temperature
d) all of the above
d) all of the above
Quenching?
a) causes distortion in metal and cracking can occur
b) varies in cooling plates
c) cools metal to achieve a desired hardness
d) all of the above
d) all of the above
The tempering stage?
a) allows a slight amount of carbon to escape from the unit cell
b) requires temperatures above the lower critical critical temperatures
c) decrease part toughness
d) is not common
a) allows a slight amount of carbon to escape from the unit cell
The case harndening process that requires A,Q,T before case hardening is?
a) induction
b) carburizing
c) carbonitriding
d) nitriding
d) nitriding
