3501-15 - METALS COMMON CHARACTERISTICS: (1) The atoms or...

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1 METALS COMMON CHARACTERISTICS: (1) The atoms or molecules are in ______________ with the electrons from the outer shell of the atoms in a common "electron gas," which binds the molecules together. Metallic Bond (2) Atoms are packed in _________________ . COMMON CHARACTERISTICS OF METALS: (3) High _____________________ (4) High ___________ One plane of close-packed atoms can slide over another one without fracture. TWO GROUPS OF METALS: (1) ____________ metals- metals in which the principal element is not Iron, as in Copper, Tin, Lead, Nickel & Aluminum. (2) ___________ metals - metals in which the principal element is Iron. THREE COMMON FORMS OF FERROUS METAL: 1. WROUGHT IRON - iron containing a small amount of ____ (less than 3%) and a very small amount of ______ (less than 0.1%). Slag particles appear as long fibrous elements in the iron. - high ductility and toughness. 2. CAST IRON - contains __________________ . (A) Gray cast iron - produced by _____________ of molten iron. Most of the carbon are separated in the form of __________ (in flake form) - easily machined but low in ductility.
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2 (B) White cast iron - produced by ___________ of molten iron. Most of the carbon remained combined with iron in the form of ___________ . - high strength - very brittle - not easily machined - abrasion resistant (C) Ductile Cast Iron- contains 0.05% of ___________ . Most of the carbon are in the form of spheroidal graphite. -higher _______________________ as compared with gray cast iron. 3. STEEL -- .05% to 2.0% Carbon (usually less than _______ ) Properties depend on : (A) Carbon content (B) Alloying elements (C) Microstructure (which can be modified through heat treatments) (D) Mechanical work (such as work - hardening) Principal uses in construction: (A) structural steel (B) reinforcing bars (C) form works TESTS ON METALS 1. TENSION TEST - to obtain stress-strain diagram & the following properties: (A) Yield Strengths at certain offset (B) Ultimate Tensile Strength (C) Elastic Modulus (D) % Elongation at failure (measure of ductility) 2. HARDNESS TEST (A) Brinell Hardness test Brinell Hardness Number (BHN) = load mass/ indented area = p / [ π D/2 ( D - (D 2 -d 2 ) ) ]
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3 (B) ROCKWELL HARDNESS TEST A minor load is first applied to seat the indenter. A major load is then applied. The indentation (d) by the major load is then measured (after the major load is removed).
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This note was uploaded on 05/26/2011 for the course CGN 3501 taught by Professor Mang during the Fall '10 term at University of Florida.

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3501-15 - METALS COMMON CHARACTERISTICS: (1) The atoms or...

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