Materials Final Review (TESTS I‚ II‚ & III) Part I : Multiple Choice 1) As the temperature of a polymer increases‚ its density a. Increases b. Decreases c. Remains fairly constant 2) Which one of the three polymer types does not involve cross-linking: a. Elastomers b. Thermoplastics c. Thermosets 3) Degree of polymerization is which of the following: a. Average number of mers in the molecule chain b. Proportion of the monomer that has been polymerized c. Sum of the molecule weights of the
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Analysis………………………………………………………………………………………7 Conclusions……………………………………………………………………………………………….11 Works Cited………………………………………………………………………………………………12 Statement of Intent The purpose of the experiment was to run a Charpy Impact Test and compare the energy absorbed between 4130 steel and A36 hot rolled steel and find the ductile to brittle transition for each. Background The Charpy test works by suspending a notched specimen at both ends and then breaking the specimen by a falling pendulum. The energy absorbed‚ as read on the machine‚
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The Iron–Iron Carbide (Fe–Fe3C) Phase Diagram • In their simplest form‚ steels are alloys of Iron (Fe) and Carbon (C). • The Fe-C phase diagram is a fairly complex one‚ but we will only consider the steel part of the diagram‚ up to around 7% C b d Carbon. • Phases present α-ferrite‚ γ-ferrite‚ δ-ferrite‚ Fe3C (iron carbide or cementite) Fe-C liquid solution School of Mechanical and Building Sciences‚ VIT University‚ Vellore 1 Phases in Fe–Fe3C Phase Diagram α-ferrite
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the raw materials‚ right through to the end products and finishing treatments‚ with some technical info in between. Information has been extracted from various sources‚ books‚ both old and modern‚ the internet and general companies that process steel‚ that I have come across in my working environment. Production and Properties of Metals The term metal production refers to all of the processes involved in the conversion of a raw material‚ such as a metallic ore‚ to a final form in which the
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materials are used in the R.C.C. structures:- (1) Cement (2) Steel (3) Sand (4) Aggregates (5) Water 2. Different types of steel bars used in R.C.C. works are mentioned below: 1) Mild Steel plain bars (Generally M.S. round bars are used) 2) Medium Tensile Steel bars 3) High yield strength deformed bars (H.Y.S.D. bars) 1. Mild Steel Bars (M.S. Bars) In past‚ mild steel was available in two different categories. 1. M.S. Plain
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a. 0.0125. b. 0.0125Nm-2. A Load (N) B C D Extension (m) c. 0.125. 4. The graph to the right is an example of what type of material? a. Ferrous metal. b. Non-ferrous metals. c. Plastics. 5. The Vickers test uses: a. Small steel ball bearing. b. A conical shaped‚ diamond tipped indenter. c. A square based‚ diamond tipped indenter. 6. Creep occurs at temperatures: a. At or above 0.4T where T = melting point in Kelvin. b. At or above 0.5T where T = boiling point
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1.1 Steel Manufacturing Process Steel production involves several processing stages including iron making‚ primary and secondary steel making‚ casting and hot rolling. These are followed by some of the following fabrication processes: cold rolling‚ forming‚ forging‚ joining‚ machining‚ coating and/or heat treatment. Steels can be made either from raw materials (e.g. iron ore‚ coal and limestone) or by recycling steel scrap. In response to the requirements of society‚ steel processing is
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Case 1‚ Armco Inc. – Midwestern Steel Division Armco Inc is a steel manufacturer that used to be the sixth largest in its industry in United States in 1990. The Kansas City Works within its Midwestern Steel Division was hit by the decline in the business in the US steel industry. The firm produces grinding media and carbon wire rod. The first one has been successful in the industry with its great durability compared to the competitors. Carbon wire rods on the other hand were non profitable and covered
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characteristics of the product. It contains the process of heat treatment including heating by means of withholding the material at a given temperature so that the phase ferrit and transform into pearlite austenite phase. Heating process is done depends on carbon content contained on the material. If you want to convert the material into austenite phase as a whole until keinti then the time warming up must be added. The speed of the warming also must be controlled so as not to cause gradients between surface
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us with oxygen‚ which is essential for our bodies to live. Without it‚ we would die within minutes. Pure air is a mixture of several gases that are invisible and odourless. It consists of about 78% nitrogen‚ 21% oxygen‚ and less than 1% of argon‚ carbon dioxide‚ and other gases — as well as varying amounts of water vapour. Pollution is one of the major problems of our country. Air pollution is the introduction into the atmosphere of chemicals‚ particulates‚ or biological materials that cause discomfort
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