1
what is an alloy?
alloys are mixtures of metals with other metals and non metals pg 6
the two classes of alloys are?
alloys containing iron (ferrous alloys) alloys that do not contain iron (non ferrous alloys) pg6
what is the CSA?
Canadian Standards Association pg 9
what materials does the CSA not cover?
material used in pressure equipment. pg 10
in SAE/AISI systems, what is the second of the four digits indicatind?
sub class (major alloying agent) pg11
what does the term "admixture"refer to?
the action of adding or mixing something in order to improve its properties. pg16
what is "Curie point"? and at what temperature does it occure?
the temperature at which ferromagnetic materials can no longer be magnetized. 770*c/1418*f pg16
what is "metallurgy"?
the scientific study of extracting and refining metals and their structural properties. pg18
what is "phase transformation"
when heated metals (solids) will gradually transform into liquids and gasses. pg 22
what is the only metal not found in the solid state?
Mercury pg 22
what are the two atom structures found in steel?
BBC (ferrite) FCC (austenite)
at what point are both BCC and FCC found in steel? (transition temperature)
723*c /1333*f (eutectoid point) pg23
what can be done to change steels properties completely after fabrication?
heat treatment pg23
what are two examples of a quenched condition forming martensite?
tack welds stray arks pg27
martensite can form in the HAZ as a result of ?
fast cooling pg28
what are "substitutional" alloying atoms?
atoms that are the same size or larger than the iron atoms. pg 29
what is Nickle (ni) as an alloying agent useful for?
hardenability pg29
what is the process called when steel is heated sufficiently to cause the structure to transform and new grains grow?
"Recrystallization" pg30
at what temperature does pure iron become liquid?
liquid state 1538*c / 2800*f pg31
what are the four basic temperature zones in a weld joint?
the weld zone the fusion zone the fusion boundary the HAZ pg32
what kind of structure does the molten weld form as it begins to solidify?
Lattice structure pg34
when cooling rate is rapid, the metal is harder? T/F
"T" pg34
what is angular distortion caused by?
"transverse shrinkage" pg46
the "coefficient thermal expansion" of austenitic stainless steel is how many times greater than that of carbon steel?
1.5 times greater pg53
sensitization of austenitic stainless steel causes loss of what?
corrosion resistance pg54