Impact Test - Determines the energy absorbed in fracturing a test bar at high velocity. Test may be in tension or bending, or may be a notch test (Izod V-Notch or Charpy Key-Hole) in which the notch creates multiaxial stresses.
Impact Values - Resistance to shock and ability to distribute localized stress as measured by an impact test, usually expressed in foot-pounds.
Inclusions - Particles of non-metallic material usually oxides, sulphides, silicates and such which are entrapped mechanically or are formed during solidification or by subsequent reaction within the solid metal.
Induction Hardening - A hardening process in which the part is heated above the transformation range by electrical induction.
Ingot - A casting intended for subsequent rolling or forging. Usually cast in metallic molds.
Ingot Iron - Open hearth iron low in carbon, manganese and other impurities. Commonly called "pure iron". Sometimes used for making enameling sheets with silicon added for high grade electrical sheets.
Intergranular Corrosion - Electrochemical corrosion along the grain boundaries of an alloy, usually caused because the boundary regions contain material anodic to the center of the grain.
Iron - A metallic element. However, in the steel industry, iron represents the product of a blast furnace containing 92% to 94% iron. Blast furnace iron is also called pig iron or hot metal.
IZOO Test - A test made to determine the notched toughness of a material. The test gives the energy required to break a standard notched specimen supported as a cantilever beam.