SHOP 1 METAL

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Information about SHOP 1 METAL
Education

Published on July 23, 2009

Author: zaido66

Source: authorstream.com

Slide 1: Ken Youssefi PDM I, SJSU 1 PROPERTIES OF METALS OBJECTIVES : Ken Youssefi PDM I, SJSU 2 OBJECTIVES IDENTIFY PROPERTIES OF METALS DESCRIBE CLASSIFICATION OF STEEL DESCRIBE THE EFFECT OF ALLOYING ELEMENTS ON STEEL. Slide 3: Ken Youssefi PDM I, SJSU 3 INTRODUCTION METALS SUCH AS IRON,ALUMINUM,&COPPER ARE AMONG THE MOST COMMON ELEMENTS FOUND IN NATURE.IRON,WHICH IS FOUND IN MOST PARTS OF THE WORLD,WAS CONSIDERED A RARE & PRECIOUS METALS IN ANCIENT TIMES.THROUGHOUT THE AGES,IRON WAS TRANSFORMED INTO STEEL,& TODAY IT IS OF A MORE VERSATILE METALS MAY BE SHAPED IN SEVERAL WAYS. CASTING CUTTING & JOINING DRAWING & FORMING FORGING Slide 4: Ken Youssefi PDM I, SJSU 4 TO BETTER UNDERSTAND THIS VERSATILE METAL,KNOWLEDGE OF ITS PROPERTIES & MANUFACTURE IS DESIRABLE. PHYSICAL METALLURGY IS THE SCIENCE CONCERNED WITH THE PHYSICAL AND MECHANICAL PROPERTIES OF METALS.THE PROPERTIES OF METALS & ALLOYS ARE AFFECTED BY THREE VARIABLES: CHEMICAL PROPERTIES-THOSE THAT A METAL ATTAINS THROUGH THE ADDITION OF VARIOUS CHEMICAL ELEMENTS. PHYSICAL PROPERTIES-THOSE THAT ARE NOT AFFECTED BY OUTSIDE FORCES,SUCH AS COLOR,DENSITY,CONDUCTIVITY OR MELTING TEMPERATURE. MECHANICAL PROPERTIES-THOSE THAT ARE AFFECTED BY OUTSIDE FORCES SUCH AS ROLLING,FORMING,DRAWING,BENDING,WELDING AND MACHINING. Properties of Materials : Ken Youssefi PDM I, SJSU 5 Properties of Materials Properties of Materials Slide 6: Ken Youssefi PDM I, SJSU 6 TO BETTER UNDERSTAND THE USE OF VARIOUS METALS,ONE SHOULD BECOME FAMILIAR WITH THE FOLLOWING TERMS: BRITTLENESS-PROPERTY OF METAL THAT PERMITS NO PERMANENT DISTORTION BEFORE BREAKING.(EX.CAST IRON) Slide 7: Ken Youssefi PDM I, SJSU 7 DUCTILITY-THE ABILITY OF METAL TO BE PERMANENTLY DEFORMED WITHOUT BREAKING(EX:COPPER,MACHINE STEEL WHICH MAY BE DRAWN INTO WIRE,ARE DUCTILE MATERIALS.) Slide 8: Ken Youssefi PDM I, SJSU 8 ELASTICITY-THE ABILITY OF METAL TO RETURN TO ITS ORIGINAL SHAPE AFTER ANY FORCE ACTING ON IT HAS BEEN REMOVED.PROPERLY HEAT-TREATED SPRINGS ARE GOOD EXAMPLES OF ELASTIC MATERIALS. Slide 9: Ken Youssefi PDM I, SJSU 9 HARDNESS-MAY BE DEFINE AS THE RESISTANCE TO FORCIBLE PENETRATION OR PLASTIC DEFORMATION. Slide 10: Ken Youssefi PDM I, SJSU 10 MALLEABILITY-THE PROPERTY OF METAL THAT PERMITS IT TO BE HAMMERED OR ROLLED INTO OTHER SIZES AND SHAPE. Slide 11: Ken Youssefi PDM I, SJSU 11 TENSILE STRENGTH-THE MAXIMUM AMOUNT OF PULL THAT A MATERIAL WILL WITHSTAND BEFORE BREAKING TOUGHESS-PROPERTY OF METAL TO WITHSTAND SHOCK AN OPPOSITE CONDITION OF BRITTLENESS. Slide 12: Ken Youssefi PDM I, SJSU 12 CLASSIFICATION OF STEEL STEEL MAY BE CLASSIFIED INTO TWO GROUPS: PLAIN CARBON STEELS ALLOY STEELS. Slide 13: Ken Youssefi PDM I, SJSU 13 MAY BE CLASSIFIED AS THOSE THAT CONTAIN ONLY CARBON AND NO OTHER MAJOR ALLOYING ELEMENT. LOW-CARBON STEEL-CONTAINS FROM 0.02%TO 0.30% CARBON BY MASS. MOST COMMON STEEL KNOWN AS MILD STEEL. BOLTS,NUTS,WASHERS,SHEET METAL,AND SHAFTS. MEDIUM-CARBON STEEL CONTAINS FROM 0.30% TO 0.60% CARBON USED WHERE HIGH STRENGTH IS REQUIRED LIKE ENGINE COMPONENTS WRENCHES,HAMMERS,AND SCREW DRIVERS. HIGH-CARBON STEEL CONTAINS OVER 0.60% CARBON AND MAY RANGE AS HIGH AS 1.7%. ALSO KNOWN AS TOOL STEEL CUTTING TOOLS,PUNCHES,TAPS,DIES,DRILLS,AND REAMERS. PLAIN CARBON STEEL Slide 14: Ken Youssefi PDM I, SJSU 14 ALLOY STEELS MAY BE DEFINE AS STEEL CONTAINING OTHER ELEMENTS,IN ADDITION TO CARBON. THE ADDITION OF ALLOYING ELEMENTS MAY IMPART ONE OR MORE OF THE FOLLOWING PROPERTIES TO THE STEEL: INCREASE IN TENSILE STRENGTH INCREASE IN HARDNESS INCREASE IN TOUGHNESS ALTERATION OF THE CRITICAL TEMPERATURE OF THE STEEL. INCREASE IN WEAR ABRASION RED HARDNESS CORROSION RESISTANCE Slide 15: Ken Youssefi PDM I, SJSU 15 COMMONLY ADDED ELEMENTS Mn : TO IMPROVED STRENGTH AND HARDNESS Cr : TO IMPROVED STRENGTH AND WEAR RESISTANCE Cu : TO IMPROVED STRENGTH AND CORROSION RESISTANCE Mo : TO IMPROVED HEAT RESISTANCE AND TOUGHNESS Ni : TO IMPROVED STRENGTH AND TOUGHNESS. Si : TO IMPROVED STRENGTH AND TOUGHNESS. SOURCE:TECHNOLOGY OF MACHINE TOOLS SIXTH EDITION KRAR,GILL,SMID

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