PENETRANT
INSPECTION |
NON-DESTRUCTIVE
TEST TO CHECK FOR THE EXISTENCE OR EXTENT OF
DISCONTINUITIES THAT ARE OPEN TO THE SURFACE.
A PENETRATING DYE IS USED FOR THIS TEST. |
PERMALLOY |
NICKEL
ALLOYS CONTAINING ABOUT 20 -60% FE, USED FOR
THEIR HIGH MAGNETIC PERMEABILITY AND ELECTRICAL
RESISTIVITY. |
PERMANENT
SET |
THE
DEFORMATION OF METAL UNDER STRESS, THAT OCCURS
AFTER PASSING ITS ELASTIC LIMIT. |
PHYSICAL
PROPERTIES |
THE
PROPERTIES, OTHER THAN MECHANICAL, THAT PERTAIN
TO THE PHYSICS OF A MATERIAL. I.E. DENSITY,
HEAT AND ELECTRICAL CONDUCTIVITY, THERMAL EXPANSION
ETC. |
PICKLING |
REMOVING
SURFACE OXIDES FROM METALS BY CHEMICAL OR ELECTROCHEMICAL
REACTION. IN STAINLESS IT TURNS MATERIAL GRAY. |
PIN
EXPANSION TEST |
A
TEST FOR DETERMINING THE ABILITY OF TUBES TO
BE EXPANDED OR FOR REVEALING THE PRESENCE OF
CRACKS OR LONGITUDINAL WEAKNESS. |
PIN
HOLES |
MICROSCOPIC
IMPERFECTIONS IN THE SURFACE OR THROUGH A LAYER
OR THICKNESS OF METAL. |
PIPE |
1)
A TUBULAR METAL PRODUCT. 2) DEFECT. A CAVITY
IN A CASTING BILLET OR INGOT CAUSED BY CONTRACTION
OR SHRINKAGE. |
PITTING |
SMALL
SHARP CAVITIES IN A METAL SURFACE. |
PLANIMETRIC
METHOD |
A
METHOD OF MEASURING GRAIN SIZE. THE GRAINS
WITHIN A SPECIFIC AREA ARE COUNTED. |
PLASTIC
DEFORMATION |
SEE
PERMANENT SET |
PLASTICITY |
THE
ABILITY OF A METAL TO BE DEFORMED EXTENSIVELY
WITHOUT RUPTURE. |
PLATING |
A
THIN COAT OF METAL LAID ON ANOTHER METAL BY
ELECTRO- PLATING, GALVANIZING, TINNING, ETC. |
POT ANNEALING |
SEE
BOX ANNEALING |
POWDER
METALLURGY |
THE
ART OF PRODUCING POWDERED METALS AN UTILIZING
METAL POWDERS FOR PRODUCTION OF PARTS. |
PRECIPITATION
HARDENING |
HARDENING
CAUSED BY THE PRECIPITATION OF A CONSTITUENT
FROM A SUPERSATURATED SOLID SOLUTION. |
PRECIPITATION HEAT TREATMENT |
RELATES
TO NON-FERROUS METAL ANY OF THE VARIOUS AGING
TREATMENTS, DONE AT ELEVATED TEMP- ERATURES
TO IMPROVE CERTAIN MECHANICAL PROPERTIES. |
PRIME |
MATERIAL
FREE FROM VISIBLE SURFACE DEFECTS. |
PROCESS
ANNEALING |
THE
FERROUS ALLOY IS HEATED TO A TEMPER- ATURE
JUST BELOW THE LOWER LIMIT OF THE TRANSFORMATION
TEMPERATURE AND THEN COOLED. THIS SOFTENS THE
MATERIAL. |
PROOF
STRESS |
1)
THE STRESS THAT WILL CAUSE A SPECIFIED SMALL
PERMANENT SET IN A MATERIAL. 2) A SPECIFIED
STRESS TO BE APPLIED TO A MEMBER OR STRUCTURE
TO INDICATE ITS ABILITY TO WITHSTAND SERVICE
LOADS. |
PULSE-ECHO METHOD |
A
NON-DESTRUCTIVE TEST IN WHICH PULSES OF ENERGY
ARE DIRECTED INTO A PART AND THE TIME FOR THE
ECHO TO TO RETURN FROM ONE OR MORE REFLECTING
SURFACE IS MEASURED. |
PUNCH |
MOVABLE
PART THAT FORCES METAL INTO A DIE. USED FOR
BLANKING, COINING, EMBOSSING, DRAWING, STAMPING,
ETC. |
QUENCHING |
THE
STEP OF COOLING METALS QUICKLY. THE QUENCHING
CAN BE DONE IN WATER OR OIL. |
RADIOGRAPHY |
A
NON-DESTRUCTIVE METHOD IN INTERNAL EXAMINATION.
METAL OBJECTS ARE EXPOSED TO X-RAYS OR GAMMA
RADIATION. |
RECRYSTALLIZATION |
A
PROCESS WHERE DISTORTED GRAIN STRUCTURES IN
COLD WORKED METAL IS REPLACED BY NEW, STRESS
FREE GRAIN STRUCTURES BY CERTAIN ANNEALING
PROCESSES. |
REFINING TEMPERATURE |
A
TEMPERATURE USED IN HEAT TREATMENT OF STEEL
TO REFINE THE STRUCTURE AND GRAIN SIZE. |
REFRACTORY |
A
HEAT RESISTANT MATERIAL, USUALLY NONMETALLIC,
WHICH IS USED FOR FURNACE LINING. |
REFRACTORY ALLOY |
METAL
WITH EXTREMELY HIGH MELTING POINT. |
RESIDUAL
STRESS |
MACROSCOPIC
STRESSES THAT ARE SET UP WITHIN A METAL AS
A RESULT OF NON-UNIFORM PLASTIC DEFORMATION. |
RESIDUALS |
THE
"TRACE" ELEMENTS NOT NAMED IN SPECIFICATIONS.
THEY ARE THE RESULT OF CONTAMINATED SCRAP. |
RIBBON WOUND |
STRIP
WOUND LAYER ON TOP OF LAYER...AS A ROLL OF
TAPE. THIS TYPE OF ROLLING IS DONE AROUND A
CORE. |
RIPPLE |
DEFECT.
SLIGHT TRAVERSE WAVE OR SHADOW APPEARING AT
INTERVALS ALONG THE STRIP OR SHEET. |
ROCKWELL HARDNESS |
A
STANDARD METHOD OF MEASURING HARD- NESS. IT
IS A MEASUREMENT OF PENETRATION UNDER SPECIFIC
LOAD. |
ROLLED
EDGE |
THE
DEBURRING OF AN EDGE BY A SYSTEM OF ROLLERS
WHICH SHAPE THE EDGE OF THE MATERIAL. |
ROTARY
SHEAR |
A
CUTTING MACHINE WITH SHARPENED CIRCULAR BLADES.
A SLITTER. |
SALT FOG (SPRAY) TEST |
A
CORROSION TEST IN WHICH THE METAL IS SUBJECTED
TO A FINE MIST OF SALT WATER. |
SCAB |
A
BLEMISH ON A CASTING. |
SCALING |
1)
LAYERS OF OXIDATION 2) THE REMOVAL OF SCALE
FROM METAL |
