|
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 |