Matse259 Outline - Sheyla M Matos MATSE 259 OUTLINE...

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Sheyla M Matos MATSE 259- OUTLINE Properties and Processing of Engineering Materials 1. What are some general categories of properties of engineering materials? Mechanical Electrical Thermal Magnetic Optical Deteriorative 2 . Materials science is the study of the relationships between the structures and properties of materials. 3 . Materials engineering is the design or engineering of a material to produce the desired properties. 4. Primary Classes of Materials a) Metals (e.g. aluminum, iron, and titanium) b) Ceramics (e.g. Al2O3, Fe3C, and SiC) c) Polymers (e.g. acrylic, polyethylene, and nylon) Other “classes” Composites Semiconductors (e.g. silicon, germanium, and SiC) d) Composition
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e) Structure/Bonding f) Properties 5. Low and Medium Carbon Steel Nomenclature Four digit number First two give alloy Second two give wt% carbon × 100 UNS number starts with G Some alloy types 10XX, plain carbon 41XX, Cr + Mo 43XX, Ni + Cr + Mo
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6. Tool and Stainless Steel Nomenclature Tool steels High carbon content (0.6-1.4 wt. %) AISI code denoted by letter+number e.g. M1, A2, etc. UNS number starts with T Stainless steels >11 wt. % Cr 3XX series, austenitic 4XX series, ferritic and martensitic XX-XPH, precipitation hardened UNS number starts with S 7. Properties of hot rolled and normalized steels Type Tensile strength 1020 64.0 ksi 1030 75.5 ksi 1040 85.5 ksi 1050 108.5 ksi 1060 112.5 ksi 1080 146.5 ksi
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8. How else can steel properties be changed? Steel Tensile strength 1040 hot rolled and normalized 86 ksi 1040 quenched and tempered at 400 F 130 ksi 8640 quenched and tempered at 400 F 270 ksi (8640: Fe - 0.5%Cr - 0.5%Ni - 0.2%Mo - 0.4%C) 9. Tensile Behavior of Steels Features Elastic response Yielding behavior Ultimate strength Failure Influence of alloy chemistry 10. What do these things do in steels? Change C content Mechanical work Change “structure” Heat treat Alloying elements Changing structure changes properties
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Introduction to Aluminum Alloys 11. Aluminum Alloy Overview Low density (~34% of steel) High thermal and electrical conductivity Corrosion resistant in ambient air Low melting point (660°C) Modified mechanical properties via cold work, alloying, and heat treating 12. Aluminum Alloy Nomenclature Aluminum Association Number 4 digit number + temper designation (letter and sometimes numbers) Wrought vs. cast designation 4 digits, no punctuation (e.g. 6061) 4 digits, decimal point between last two digits (e.g. 295.0) Table First digit indicates alloy group 1XXX Aluminum ≥99.00% 2XXX Copper 3XXX Manganese 4XXX Silicon 5XXX Magnesium 6XXX Magnesium + Silicon 7XXX Zinc
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8XXX other elements
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