types of material ie 351 lecture 3. why materials ??? ashby,: material selection in mechanical...
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Types of Material
IE 351
Lecture 3
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Why Materials ???
Ashby,: Material Selection in Mechanical Design
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Engineering Materials
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Materials
Nanomaterials, shape-memory alloys, superconductors, …
Ferrous metals: carbon-, alloy-, stainless-, tool-and-die steels
Non-ferrous metals: aluminum, magnesium, copper, nickel, titanium, superalloys, refractory metals, beryllium, zirconium, low-melting alloys, gold, silver, platinum, …
Plastics: thermoplastics (acrylic, nylon, polyethylene, ABS,…) thermosets (epoxies, Polymides, Phenolics, …) elastomers (rubbers, silicones, polyurethanes, …)
Ceramics, Glasses, Graphite, Diamond, Cubic Boron Nitride
Composites: reinforced plastics, metal-, ceramic matrix composites
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Properties of materials
Mechanical properties of materialsStrength, Toughness, Hardness, Ductility,Elasticity, Fatigue and Creep
Chemical propertiesOxidation, Corrosion, Flammability, Toxicity, …
Physical propertiesDensity, Specific heat, Melting and boiling point,Thermal expansion and conductivity,Electrical and magnetic properties
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Material Specification
• Chemical composition
• Mechanical properties – Strength, hardness (under various conditions: temperature, humidity, pressure)
• Physical properties – density, optical, electrical, magnetic
• Environmental – green, recycling
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Metals
• Ferrous Metals– Cast irons– Steels
• Super alloys– Iron-based– Nickel-based– Cobalt-based
• Non-ferrous metals– Aluminum and its alloys– Copper and its alloys– Magnesium and its alloys– Nickel and its alloys– Titanium and its alloys– Zinc and its alloys– Lead & Tin– Refractory metals– Precious metals
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General Properties and Applications of Ferrous Alloys
• Ferrous alloys are useful metals in terms of mechanical, physical and chemical properties.
• Alloys contain iron as their base metal.
• Carbon steels are least expensive of all metals while stainless steels is costly.
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Carbon and alloy steels
Carbon steels
• Classified as low, medium and high:
1. Low-carbon steel or mild steel, < 0.3%C, bolts, nuts and sheet plates.
2. Medium-carbon steel, 0.3% ~ 0.6%C, machinery, automotive and agricultural equipment.
3. High-carbon steel, > 0.60% C, springs, cutlery, cable.
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Carbon and alloy steels
Alloy steels
• Steels containing significant amounts of alloying elements.
• Structural-grade alloy steels used for construction industries due to high strength.
• Other alloy steels are used for its strength, hardness, resistance to creep and fatigue, and toughness.
• It may heat treated to obtain the desired properties.
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Carbon and alloy steels
High-strength low-alloy steels
• Improved strength-to-weight ratio.
• Used in automobile bodies to reduce weight and in agricultural equipment.
• Some examples are:
1. Dual-phase steels
2. Micro alloyed steels
3. Nano-alloyed steels
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Stainless steels• Characterized by their corrosion resistance,
high strength and ductility, and high chromium content.
• Stainless as a film of chromium oxide protects the metal from corrosion.
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Stainless steels
• Five types of stainless steels:
1. Austenitic steels
2. Ferritic steels
3. Martensitic steels
4. Precipitation-hardening (PH) steels
5. Duplex-structure steels
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Typical Selection of Carbon and Alloy Steels for Various Applications
TABLE 5.1Product Steel Product SteelAircraft forgings,
tubing, fittingsAutomobile bodiesAxlesBall bearings and racesBoltsCamshaftsChains (transmission)Coil springsConnecting rodsCrankshafts (forged)
4140, 8740
10101040, 4140521001035, 4042, 48151020, 10403135, 314040631040, 3141, 43401045, 1145, 3135, 3140
Differential gearsGears (car and truck)Landing gearLock washersNutsRailroad rails and wheelsSprings (coil)Springs (leaf)TubingWireWire (music)
40234027, 40324140, 4340, 87401060313010801095, 4063, 61501085, 4063, 9260, 615010401045, 10551085
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Mechanical Properties of Selected Carbon and Alloy Steels in Various Conditions
TABLE 5.2 Typical Mechanical Properties of Selected Carbon and Alloy Steels in the Hot-Rolled,Normalized, and Annealed ConditionAISI Condition Ultimate
tensilestrength(MPa)
YieldStrength(MPa)
Elongation in50 mm (%)
Reduction ofarea (%)
Hardness(HB)
1020
1080
3140
4340
8620
As-rolledNormalizedAnnealedAs-rolled
NormalizedAnnealed
NormalizedAnnealed
NormalizedAnnealed
NormalizedAnnealed
448441393
1010965615891689
1279744632536
346330294586524375599422861472385357
363536121124192412222631
596766172045575036495962
143131111293293174262197363217183149
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AISI Designation for High-Strength Sheet Steel
TABLE 5.3Yield Strength Chemical
CompositionDeoxidation
Practice
psi x 103 MPa
35404550607080
100120140
240275310350415485550690830970
S = structural alloy
X = low alloy
W = weathering
D = dual phase
F = killed plus sulfide inclusion control
K = killed
O = nonkilled
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Room-Temperature Mechanical Properties and Applications of Annealed Stainless Steels
TABLE 5.4 Room-Temperature Mechanical Properties and Typical Applications of Selected AnnealedStainless Steels
AISI(UNS)
Ultimatetensile
strength(MPa)
Yieldstrength(MPa)
Elongationin 50 mm
(%) Characteristics and typical applications303(S30300)
550–620 240–260 53–50 Screw machine products, shafts, valves, bolts,bushings, and nuts; aircraft fittings; bolts; nuts;rivets; screws; studs.
304(S30400)
565–620 240–290 60–55 Chemical and food processing equipment,brewing equipment, cryogenic vessels, gutters,downspouts, and flashings.
316(S31600)
550–590 210–290 60–55 High corrosion resistance and high creep strength.Chemical and pulp handling equipment,photographic equipment, brandy vats, fertilizerparts, ketchup cooking kettles, and yeast tubs.
410(S41000)
480–520 240–310 35–25 Machine parts, pump shafts, bolts, bushings, coalchutes, cutlery, tackle, hardware, jet engine parts,mining machinery, rifle barrels, screws, andvalves.
416(S41600)
480–520 275 30–20 Aircraft fittings, bolts, nuts, fire extinguisherinserts, rivets, and screws.
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Tool and die steels
• Designed for high strength, impact toughness, and wear resistance at a range of temperatures.
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Basic Types of Tool and Die Steels
TABLE 5.5Type AISIHigh speed
Hot work
Cold work
Shock resisting
Mold steels
Special purpose
Water hardening
M (molybdenum base)T (tungsten base)H1 to H19 (chromium base)H20 to H39 (tungsten base)H40 to H59 (molybdenum base)D (high carbon, high chromium)A (medium alloy, air hardening)O (oil hardening)SP1 to P19 (low carbon)P20 to P39 (others)L (low alloy)F (carbon-tungsten)W
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Processing and Service Characteristics of Common Tool and Die Steels
TABLE 5.6 Processing and Service Characteristics of Common Tool and Die Steels
AISIdesignation
Resistance todecarburization
Resistance tocracking
Approximatehardness(HRC) Machinability Toughness
Resistance tosoftening
Resistance towear
M2 Medium Medium 60–65 Medium Low Very high Very highT1 High High 60–65 Medium Low Very high Very highT5 Low Medium 60–65 Medium Low Highest Very highH11, 12, 13 Medium Highest 38–55 Medium to high Very high High MediumA2 Medium Highest 57–62 Medium Medium High HighA9 Medium Highest 35–56 Medium High High Medium to
highD2 Medium Highest 54–61 Low Low High High to very
highD3 Medium High 54–61 Low Low High Very highH21 Medium High 36–54 Medium High High Medium to
highH26 Medium High 43–58 Medium Medium Very high HighP20 High High 28–37 Medium to high High Low Low to
mediumP21 High Highest 30–40 Medium Medium Medium MediumW1, W2 Highest Medium 50–64 Highest High Low Low to
medium
Source: Adapted from Tool Steels, American Iron and Steel Institute, 1978.
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Aluminium and aluminium alloys• Factors for selecting are:
1. High strength to weight ratio
2. Resistance to corrosion
3. High thermal and electrical conductivity
4. Ease of machinability
5. Non-magnetic
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Magnesium and magnesium alloys• Magnesium (Mg) is the lightest metal.
• Alloys are used in structural and non-structural applications.
• Typical uses of magnesium alloys are aircraft and missile components.
• Also has good vibration-damping characteristics.
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Copper and copper alloys
• Copper alloys have electrical and mechanical properties, corrosion resistance, thermal conductivity and wear resistance.
• Applications are electronic components, springs and heat exchangers.
• Brass is an alloy of copper and zinc.
• Bronze is an alloy of copper and tin.
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Nickel and nickel alloys
• Nickel (Ni) has strength, toughness, and corrosion resistance to metals.
• Used in stainless steels and nickel-base alloys.
• Alloys are used for high temperature applications, such as jet-engine components and rockets.
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Superalloys• Superalloys are high-temperature alloys use
in jet engines, gas turbines and reciprocating engines.
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Titanium and titanium alloys
• Titanium (Ti) is expensive, has high strength-to-weight ratio and corrosion resistance.
• Used as components for aircrafts, jet-engines, racing-cars and marine crafts.
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Refractory metals
• Refractory metals have a high melting point and retain their strength at elevated temperatures.
• Applications are electronics, nuclear power and chemical industries.
• Molybdenum, columbium, tungsten, and tantalum are referred to as refractory metal.
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Other nonferrous metals
1. Beryllium
2. Zirconium
3. Low-melting-point metals: - Lead- Zinc- Tin
4. Precious metals: - Gold - Silver- Platinum
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Special metals and alloys
1. Shape-memory alloys (i.e. eyeglass frame, helical spring)
2. Amorphous alloys (Metallic Glass)
3. Nanomaterials
4. Metal foams
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Heat Treatment of Metals
• Annealing– Full annealing– Normalising (faster rate of cooling)– Recovery annealing (longer holding time, slower
rate of cooling,)– Stress relieving (lower temperature)
• Martensite formation in steel– Austenitizing (conversion to austenite)– Quenching (control cooling rate– Tempering (reduce brittleness)
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Heat Treatment of Metals
• Precipitation hardening– Solution treatment (-phase conversion)– quenching– precipitation treatment (aging)
• Surface hardening– Carburizing– Nitriding– Carbonitriding– Chromizing and Boronizing
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Heat Treatment of Steel
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Precipitation Hardening
Solution treatment
Quenching
Precipitation treatment
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Furnaces for Heat Treatment
• Fuel fire furnaces– gas– oil
• Electric furnaces– batch furnaces
• box furnaces - door
• car-bottom furnaces - track for moving large parts
• bell-type furnaces - cover/bell lifted by gantry crane
– continuous furnaces
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Furnaces for Heat Treatment
• Vacuum furnaces
• Salt-bath furnaces
• Fluidized-bed furnaces
Some of the furnaces have special atmosphere requirements, such as carbon- and nitrogen- rich atmosphere.
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Surface Hardening Methods
• Flame hardening
• Induction heating
• High-frequency resistance heating
• Electron beam heating
• Laser beam heating
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Surface Hardening Methods
Inductionheating
High frequencyresistanceheating
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Classification of Ceramics
• Ceramics– Traditional ceramics– New ceramics– Glass
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Ceramics
• Traditional ceramics– clays: kaolinite– silica: quartz, sandstone– alumina– silicon carbide
• New ceramics– oxide ceramics : alumina– carbides : silicon carbide, titanium carbide, etc.– nitrides : silicon nitride, boron nitiride, etc.
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Glass
• Glass products– window glass– containers– light bulb glass– laboratory glass– glass fibers– optical glass
• Glass ceramics - polycrystalline structure
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Classification of Polymers
– Thermoplastics
– Thermosets
– Elastomers
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Polymers
• Thermoplastics - reversible in phase by heating and cooling. Solid phase at room temperature and liquid phase at elevated temperature.
• Thermosets - irreversible in phase by heating and cooling. Change to liquid phase when heated, then follow with an irreversible exothermic chemical reaction. Remain in solid phase subsequently.
• Elastomers - Rubbers
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Thermoplastics
– Acetals– Acrylics - PMMA– Acrylonitrile-Butadiene-Styrene - ABS– Cellulosics– Fluoropolymers - PTFE , Teflon– Polyamides (PA) - Nylons, Kevlar– Polysters - PET– Polyethylene (PE) - HDPE, LDPE– Polypropylene (PP)– Polystyrene (PS)– Polyvinyl chloride (PVC)
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Thermosets
• Amino resins
• Epoxies
• Phenolics
• Polyesters
• Polyurethanes
• Silicones
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Elastomers• Natural rubber
• Synthetic rubbers– butadiene rubber– butyl rubber– chloroprene rubber– ethylene-propylene rubber– isoprene rubber– nitrile rubber– polyurethanes– silicones– styrene-butadiene rubber– thermoplastic elastomers
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Classification of Composite Materials
– Metal Matrix Composites
– Ceramic Matrix Composites
– Polymer Matrix Composites
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Composite Materials
• Metal Matrix Composites (MMC)Mixture of ceramics and metals reinforced by strong,
high-stiffness fibers
• Ceramic Matrix Composites (CMC)Ceramics such as aluminum oxide and silicon carbide
embedded with fibers for improved properties, especially high temperature applications.
• Polymer Matrix Composites (PMC)Thermosets or thermoplastics mixed with fiber
reinforcement or powder.
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Composite Materials
1D fibre
Woven fabric
Random fibre
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Composite Materials
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Taxonomy of Materials Selection
Ashby,: Material Selection in Mechanical Design
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