metalurgy

Information about metalurgy

Published on January 5, 2008

Author: FunnyGuy

Source: authorstream.com

Content

Agricultural Mechanics CD Identifying Metals and Their Physical Properties :  Agricultural Mechanics CD Identifying Metals and Their Physical Properties Lesson A5–1 Slide2:  A. Metal is an element. There are over 100 known elements, and about 75 percent of them are classified as metals. B. An alloy is a mixture of two or more metals, or of metals and one or more non-metals.:  B. An alloy is a mixture of two or more metals, or of metals and one or more non-metals. 1. The elements added to a metal to form an alloy may be either metal or non-metal. 2. In most cases alloys have more desirable properties and are less expensive than pure metals. Slide4:  C. High temperature creep is the slow stretching of steel under stress at high temperatures. D. Adhesion is the sticking together of two unlike metals involving a mechanical bond. The mechanical bond involves the flowing of a metal in a liquid form into the pores of a metal in a solid form. Slide5:  E. Annealing is the softening of metal and removing of the brittleness. The annealing process is done by heating the metal to a cherry red and then allowing it to cool slowly in vermiculite, dry hot sand, or a furnace. F. Tempering is obtaining the desired hardness and toughness in metal. G. The process of making steel harder is known as hardening. :  G. The process of making steel harder is known as hardening. This is done by heating the steel to a cherry red color, then cooling it quickly in water. 1. Hardened steel is not only extremely hard but also brittle. 2. Hardening is the first step in tempering. 3. Hardness is the ability of a material to resist being indented. Slide7:  H. Casting is pouring melted metal into a mold so that it will be a certain shape after cooling. I. The capability of being extended or shaped by being beaten with a hammer or by being pressed by rollers is known as malleable. What are the properties and structures of metals?:  What are the properties and structures of metals? The distinct characteristics used to help identify a given metal are referred to as its properties.:  The distinct characteristics used to help identify a given metal are referred to as its properties. A. These characteristics include::  A. These characteristics include: brittleness color corrosion resistance ductility malleability strength. B. These properties can be categorized into seven broad classifications. :  B. These properties can be categorized into seven broad classifications. 1. Mechanical properties:  1. Mechanical properties hardness brittleness ductility percent elongation toughness wear strength a. Tensile strength is the ability of a metal to resist being pulled apart.:  a. Tensile strength is the ability of a metal to resist being pulled apart. b. Compressive strength is the ability of a metal to resist deformation by forces pushing it together.:  b. Compressive strength is the ability of a metal to resist deformation by forces pushing it together. c. Shear strength is the ability of a metal to resist forces acting in opposite directions.:  c. Shear strength is the ability of a metal to resist forces acting in opposite directions. d. Fatigue strength is the ability of a metal to take repeated loads without deforming.:  d. Fatigue strength is the ability of a metal to take repeated loads without deforming. Slide17:  e. Impact strength is the ability of a metal to resist shock. f. Flexure strength is the ability of a metal to bend without deforming or breaking. 2. Chemical properties:  2. Chemical properties refers to the chemical make-up of the metal and its ability to resist reaction with the environment. 2. Chemical properties (Cont.):  2. Chemical properties (Cont.) a. Chemical properties are oxide or compound composition, acidity or alkalinity of the metal; corrosion resistance; resistance to acids and salts; and resistance to other chemicals. b. Corrosion resistant metal will resist deterioration from heat, sunlight, water, and humidity. 3. Physical properties:  3. Physical properties relates to the dimensions, shape, specific gravity, and weight of the metal. 4. Thermal properties:  4. Thermal properties Characteristics such as: expansion contraction thermal conductivity specific heat 5. Optical properties:  5. Optical properties luster color light transmission light reflection 6. Electromagnetic properties:  6. Electromagnetic properties electrical conductivity magnetic permeability galvanic action C. Crystal Structure:  C. Crystal Structure The crystal structure of a metal is the way molecules of a substance are arranged or how they are packed or fitted together. The pattern these atoms make is called a space lattice. C. Crystal Structure (Cont.):  C. Crystal Structure (Cont.) There are 14 lattices involved in the study of metals Only three of the most common structures are of real importance here. C. Crystal Structure (Cont.):  C. Crystal Structure (Cont.) 1. The body-centered cubic arrangement has nine atoms. a. The main characteristic is their strength and the difficulty with which they are worked when cold. b. Examples: iron, molybdenum, chromium, tungsten, and vanadium at room temperature. C. Crystal Structure (Cont.):  C. Crystal Structure (Cont.) 2. The face-centered cube arrangement has fourteen atoms. a. The main characteristic is that they are plastic and malleable. b. Examples: iron, aluminum, nickel, copper, lead, platinum, and silver. C. Crystal Structure (Cont.):  C. Crystal Structure (Cont.) 3. The close-packed hexagon arrangement has seventeen atoms. a. The main characteristics are that they are non-plastic and must be heated before they can be worked. b. Examples: cadmium, cobalt, bismuth, magnesium, titanium, and zinc. How is steel manufactured? :  How is steel manufactured? Steel is an alloy of iron and carbon and usually other metals.:  Steel is an alloy of iron and carbon and usually other metals. A. There are hundreds of different steels, ranging in composition from 99 percent iron and very small amounts of carbon, to steels containing less than 55 percent iron and a large percentage of other metals.:  A. There are hundreds of different steels, ranging in composition from 99 percent iron and very small amounts of carbon, to steels containing less than 55 percent iron and a large percentage of other metals. B. There are four major steel making processes::  B. There are four major steel making processes: the Bessemer furnace the open hearth furnace electric furnace the oxygen furnace All four processes are similar in principle in that pig iron is treated with an oxygen-bearing material to burn out the carbon and impurities. Alloying metals are then added. C. There are two general types of steel: carbon and alloy.:  C. There are two general types of steel: carbon and alloy. Approximately 80 to 90 percent of steel produced is carbon steel. Carbon steels contain 0.05 to 1 percent carbon and less than 1.5 percent of the other elements. C. There are two general types of steel(Cont.):  C. There are two general types of steel(Cont.) The strength of steel increases as the carbon content increases, but the hardness, brittleness, and difficulty of fabrication also increase. There are hundreds of alloy steels. The effects of additives varies. Some of these effects are as follows: Additive Effects:  Additive Effects 1. Chromium makes the alloy hard and increases the wear and corrosion resistance of steel. Steels containing more than 4 percent chromium are called stainless steels. 2. Sulfur is added to aid in machinability of the steel. Additive Effects:  Additive Effects 6. Tungsten is used to produce tool steels that will maintain a cutting edge at high heat. 7. Aluminum helps to provide a hardened surface. 8. Molybdenum tends to increase the hardness and the endurance limits of steel. How is metal classified?:  How is metal classified? A. Ferrous metals:  A. Ferrous metals Metals whose chief ingredient is iron. Pig iron, cast iron, wrought iron, and steel are examples. B. Non-ferrous metals:  B. Non-ferrous metals are those which have no iron and are made up of a single element. These are aluminum, copper, lead, magnesium, nickel, tin, tungsten, zinc, silver, and gold. 1. Aluminum:  1. Aluminum is a silver-white, malleable, ductile metal. It is known for it’s electrical conductivity, heat conductivity, rust resistance, and light weight. 2. Copper:  2. Copper reddish-brown in color is used for tubes, wire, sheets, and plates. It has excellent workability, either hot or cold, and the highest electrical and heat conductivity of all commercial metals. 3. Lead:  3. Lead has a bluish-white color and a bright luster. It is soft, highly malleable, and ductile; has slight tenacity; and is a poor conductor of electricity. It is used for making pipe and containers for corrosive liquids. C. Ferrous alloys:  C. Ferrous alloys metals made up largely of ferrous materials but having other elements in sufficient quantities to change the ferrous characteristics. D. Non-ferrous alloys are made up of two or more nonferrous elements. :  D. Non-ferrous alloys are made up of two or more nonferrous elements. 1. Brass :  1. Brass an alloy of copper and zinc. It is ductile, malleable, and acid resistant. 2. Bronze :  2. Bronze an alloy of copper and tin behaves very much like brass when welded. 4. Pewter:  4. Pewter an alloy of 92 percent tin, 5 percent antimony and 3 percent copper. What characteristics are used to identify metals?:  What characteristics are used to identify metals? A. The Appearance Test:  A. The Appearance Test involves identification of a metal by its appearance and use. Color and appearance make certain metals such as copper, brass, and bronze easy to identify. B. The Magnetic Test:  B. The Magnetic Test involves identification of metal by the use of a magnet. C. The Chisel Test:  C. The Chisel Test involves identification of metal by the use of a hammer and cold chisel. D. The Fracture Test:  D. The Fracture Test involves identification of metal by fracturing the metal and observing the grain. E. The Flame Test:  E. The Flame Test involves identification of metals by applying a flame to them and watching what occurs. F. The Spark Test:  F. The Spark Test involves identification of metals by applying them to a grinding wheel and observing the spark that is generated. The color, shape, average length, and activity of the sparks are characteristics of the material being tested. Review:  Review 1. Identify and explain the terms associated with metals. 2. Describe the properties and structures of metals. 3. Explain how steel is manufactured. 4. Describe how metal is classified. 5. Describe the characteristics used to identify metals.

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