Metallurgy Flashcards
What is the name given by scientists to a
substance made only of one type of atom?
a. Phase
b. Element
c. Ferrite
d. BCC
b. Element
What is an alloy?
a. High strength low toughness steel
b. Formable grade of aluminum
c. A material composed of two or more
elements.
d. A mixture of ferrite and martensite
c. A material composed of two or more elements.
What are the three states of matter?
a. Plasma, solid, gas
b. Solid, gas, liquid
c. Gas, liquid, solid
d. Ferrite, solid, liquid
b. Solid, gas, liquid
Name the three most common steel numbering
systems;
a. CSA, TSSA, BCSA
b. CSA, ASTM, AISI
c. CSA, ASME, ABSA
d. CSA, ABSA, BCSA
b. CSA, ASTM, AISI
Candian Standards Association
American Society of Mechanical Engineers
American Iron and Steel Institute
What is the main difference between steel and cast iron?
a. Steel cannot be cast
b. Cast iron has more carbon
c. Cast iron is easily forged
d. Steel is lighter than cast iron
b. Cast iron has more carbon
Which crystalline structure does iron adopt at room temperature?
a. FCC
b. BCC
c. HCP
d. BCT
b. BCC
What do we see when we look at metals under a
microscope?
a. Bacteria
b. BCC crystals
c. Grains
d. Carbon
c. Grains
If a low alloy steel is cooled rapidly to room
temperature from above 910 ·c;
a. The steel will be softened
b. The steel will becomes harder
c. The steel produce large grains
d. The steel will reject its alloys
b. The steel will becomes harder
What is martensite?
a. A hard structure caused by fast cooling
b. A tough phase made by slow cooling
c. Another name for complex iron carbide
d. A phase created during stress relief
a. A hard structure caused by fast cooling
What is a phase diagram?
a. A “road map” of what structures ideally
want to form
b. A series of hardness curves
c. A cooling rate chart
d. A heat treatment chart
a. A “road map” of what structures ideally want to form
What is the melting point (temperature) of pure
iron?
a. 500 ·c
b. 723 ·c
c. 910 ·c
d. 1535 ·c
d. 1535 ·c
Why do we temper a “quenched” steel?
a. To increase its’ strength
b. To anneal the structure
c. To increase it’s toughness
d. To remove distortion
C. To increase it’s toughness
One number corresponds to one letter.
1. Fused zone
2. HAZ
3. Bonding zone
4. Zone not affected by heat
A. Surface near the fused zone
B. No chemical or physical modifications
C. Where there is grain growth
D. Where metal reached a liquid state
1-D, 2-C, 3-A, 4-B
Which element in steel contributes substantially to hardenability?
Carbon. Next highest in hardenability is manganese.
A fine grained steel such as used for pipelines has what benefit?
a. Low carbon and controlled alloying
make it strong and tough
b. Fast cooling when welding produces
brittle martensite
c. High carbon content make them easily
heat treated
d. Reduces ductility at lower operating
temperatures
a. Low carbon and controlled alloying
make it strong and tough
Which is the hardest type of structure (phase)?
a. bainite
b. austenite
c. martensite
d. ferrite
c. martensite
Join the terms in the column to letters
A - Physical property or B - Mechanical property
Thermal conductivity
Elongation
Density
Hardness
Elasticity
Elongation = B - Mechanical property ,
density= A - Physical property
hardness= B - Mechanical property
elasticity= B - Mechanical property
Thermal conductivity=A - Physical property
What series of stainless steel can be hardened by
heat treatment?
a. Ferritic
b. Pearlitic
c. Martensitic
d. Austenitic
c. Martensitic
Which of the following heat treatments produces
the softer metal?
a. quenching
b. tempering
c. normalizing
d. annealing
e. stress relief
d. annealing
Why can’t you weld austenitic stainless steel with
mild steel filler rod?
a. Causes lack of fusion
b. It will form martensite
c. The steel will be sensitized
d. Produces excessive porosity
b. It will form martensite
- What is the main difficulty in welding martensitic
stainless steels?
a. Cluster porosity
b. Internal undercut
c. Hydrogen cracking
d. Angular distortion
c. Hydrogen cracking
When welding stainless steels the heat
affected zone can become sensitize What is
“sensitization”?
a. Excessive hardness
b. Loss of corrosion resistance
c. Martensitic nodules
d. Delayed hydrogen cracking
b. Loss of corrosion resistance
What is the difference between 304 and 304L
grades of stainless?
a. 304L has a lower carbon content
b. 304 has a lower carbon content
c. 304 has a lower nickel content
d. 304L has a lower chromium content
a. 304L has a lower carbon content
What are the four basic types of Stainless steel
a. Ferritic, martensitic, austenitic, duplex
b. Ferritic, pearlitic, martensitic, bainitic
c. Ferritic, martensitic, duplex, pearlitic
d. Ferritic, martensitic, bainitic, duplex
a. Ferritic, martensitic, austenitic, duplex
What physical property affects the feeding ability
of aluminum GMAW electrodes?
a. Low stiffness (modulus of elasticity)
b. Low yield strength (yield point)
c. Low density (weight per volume)
d. Low elongation (ductility)
a. Low stiffness (modulus of elasticity)
The ability to conduct heat (thermal conductivity)
is much different between aluminum alloys?
Which alloy conducts heat faster?
a. 6061
b. 5083
a. 6061
What is the main cause of cracking in aluminum
welds?
a. Delayed hydrogen
b. Weld chemistry
c. High stresses
d. Excessive distortion
b. Weld chemistry
Cast iron repair welds are prone to porosity
because;
a. Oils will soak into the fracture surfaces
b. The heat affected zone is very hard
c. Nickel easily absorbs oily vapours
d. Cast iron is naturally full of gas
a. Oils will soak into the fracture surfaces
