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Immersed Scanning |
In ultrasonics, a planned, systematic
movement of the beam relative to the object being inspected, the
search unit being coupled to this object through a column of liquid.
In most cases the object and the search unit are submerged in water. |
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Impact |
A part formed in a confining die from
a metal slug, usually cold, by rapid single stroke application of
force through a punch causing the metal to flow around the punch
and/or through an opening in the punch or die. |
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Impact Energy (Impact Value) |
The amount of energy required to
fracture a material, usually measured by means of an Izod or Charpy
test. The type of specimen and testing conditions affect the values
and therfore should be specified. |
|
Impact Test |
- Test designed to determine the
resistance of metal to breakage by impact, usually by
concentrating the applied stress to a notched specimen.
- A test to determine the behavior
of materials when subjected to high rates of loading, usually in
bending, tension, or torsion. The quantity measured is the
energy absorbed in breaking the specimen by a single blow, as in
the Charpy or Izod.
- A test for determining the
behavior of materials when subjected to high rates of loading
under conditions designed to promote fracture, usually in
bending, tension or torsion. The quantity measured is the energy
absorbed when the specimen is broken by a single blow.
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Impurities |
Elements or compounds whose presence
in a material is undesired. |
|
Inclusion |
- A nonmetallic material in a solid
metallic matrix.
- Particles of impurities (usually
oxides, sulfides, silicates, etc.) that are held mechanically or
are formed during the solidification or by subsequent reaction
within the solid metal.
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Inclusion, Stringer |
An impurity, metallic or
non-metallic, which is trapped in the ingot and elongated
subsequently in the direction of working. It may be revealed during
working or finishing as a narrow streak parallel to the direction of
working. |
|
Indentation Hardness |
The resistance of a material to
indentation. This is the usual type of hardness test, in which a
pointed or rounded indenter is pressed into a surface under a
substantially static load. |
|
Induction Heating |
A process of heating by electrical
induction. |
|
Inert-Gas Shielded-Arc Welding |
Arc welding in an inert gas such as
argon or helium. |
|
Ingot |
- A casting suitable for hot working
or remelting.
- A casting for subsequent rolling
or forging.
|
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Inhibitor |
A substance which retards some
specific chemical reaction. |
|
Inspection Lot |
- For non-heat treated tempers, an
identifiable quantity of material of the same mill form, alloy,
temper, section and size submitted for inspection at one time.
- For heat treated tempers, an
identifiable quantity of material of the same mill form, alloy,
temper, section and size traceable to a heat treat lot or lots
and submitted for inspection at one time. (For sheet and plate,
all material of the same thickness is considered to be of the
same size.)
|
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Intercrystalline |
Between crystals, or between grains.
Same as intergranular. |
|
Intergranular Corrosion |
Corrosion occurring preferentially at
grain boundaries. (Also termed intercrystalline corroison). |
|
Interleaving |
The placing of a sheet of paper
between two adjacent layers of metal to facilitate handling and
shearing of rectangular sheets, or to prevent sticking or
scratching. |
|
Intermediate Annealing |
An annealing treatment given to
wrought metals following cold work hardening for the purpose of
softening prior to further cold working. |
|
Interrupted Aging |
The aging of an alloy at two or more
temperatures by steps, and cooling to room termperature after each
step. Compare with progressive aging. |
|
Interrupted Quenching |
Quenching in which the metal object
being quenched is removed from the quenching medium while the object
is at a temperature substantially higher than that of the quenching
medium. |
|
Interstitial Solid Solution |
A solid solution in which the solute
atoms occupy (interstitial) positions between the atoms in the
structure of the solvent. |
|
Intracrystalline |
Within or across crystals or grains.
Same as transcrystalline and transgranular. |
|
Ironing |
Thinning the walls of deep drawn
articles by reducing the clearance between punch and die. |
|
Izod Test |
A pendulum type of single-blow impact
test in which the specimen, usually notched, is fixed at one end and
broken by a falling pendulum. The energy absorbed, as measured by
the subsequent rise of the pendulum, is a measure of impact strength
or notch toughness. |
