CHARPY: The name of an impact-testing machine that tests a specimen by striking it with a swinging hammer. The
specimen is placed against anvil supports that are 40 millimeters apart.
CHATTER: In machining or grinding,
A vibration of the tool, wheel or workpiece producing a wavy surface on the work.
The finish produced by such vibration.
CHECKS (CHECK MARKS): Numerous, very small cracks in metal or other material caused in processing.
CHEMICAL FOG (AERIAL FOG) (RT): Fog caused by unwanted chemical reactions during processing of film.
A metal insert imbedded in the surface of a sand mold or core or placed in a mold cavity to increase the
cooling rate at that point.
White iron occurring on a gray iron casting, such as the chill in the wedge test.
(Unfused chaplets) A uniform line or band outlining the object and indicating the lack of fusion between
the metal and the casting.
CHLORINATION: The process of passing dry chlorine gas through molten aluminum alloys to remove trapped oxides
and dissolved gases.
CINE-FLUOROGRAPHY (RT): Cine-radiography of images produced on a fluorescent screen.
CINE-RADIOGRAPHY (RT): The production of a series of radiographs that can be viewed rapidly in sequence, thus
creating an illusion of continuity.
CIRCULAR MAGNETISM (MT): When an electric current is passed through a solid magnetic conductor, a circular
magnetic field is developed not only around the conductor, but also within the conductor.
CLADDING: A process wherein a metallic coating is applied to a base metal by simultaneously rolling the base metal
and the cladding material.
CLEAN: Free of solid or liquid contamination from the surface or in the voids of the flaw that may interfere with the
penetration of the dye penetrant into the flaws, or with the occurrence of the inspection process.
The gap or space between two mating parts.
Space provided between the relief of a cutting tool and the surface cut.
CLEARING TIME (RT): The time required for the first stage of fixing during which the whiteness (opaqueness) of the
CLEAVAGE: The splitting (fracture) of a crystal on a crystallographic plane of low index.
CLEAVAGE FRACTURE: A fracture, usually of a polycrystalline metal, in which most of the grains have failed by
cleavage, resulting in bright reflecting facets. It is one type of crystalline fracture. Contrast with SHEAR FRACTURE.