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170_Lab_4 - Effects of Heat Treatment on Steel Aluminum and...

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Effects of Heat Treatment on Steel, Aluminum and Brass Alloys MSE-170 Introduction to Materials Science Laboratory-IV Laura Andersen Student # 0528137 Group: Craig Williams, James Coe, Kaifu Lam Professor: Hanson Fong TA: Ashleigh Cooper Date: 11/26/2007 Abstract The following lab studies the effects of heat treatment on metals. Two steels of different carbon content, brass, and aluminum will be used as the four samples. The samples were heated, cooled by two different methods, and half were reheated. The heat tested samples were then tested for hardness and the values compared. An analysis of the hardness values showed that the aluminum hardened with recrystalliztion and become less hard due to grain growth, the brass had little change in hardness between the different forms of heat treatment, and the steels become harder through a quicker cooling rate due to the formation of martensite. 1
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Effects of Heat Treatment on Steel, Aluminum and Brass Alloys Introduction The following lab involves heating four metal alloy samples and cooling them in two different manners; cooled slowly to equilibrium or quenched to a non-equilibrium state. The four samples include 4340 steel and 1018 (A36) steel, 2024 aluminum, and 70-30 (260) brass. The 4340 steel has a higher carbon concentration than the 1018. The purpose of this lab is to observe and compare the effects of heat treatment, cooling rates and reheating on the microstructure and mechanical properties of steel, aluminum and brass alloys. Due to limited time and availability of instruments the principal mechanical property measured is hardness. The following report presents some background information, the procedures for the experiment, the results of the experiment, and an analysis of those results. Background Information In order to fully understand the analysis of this report, a sufficient background of the metal alloys is necessary because the composition of each alloy determines the properties and microstructures before and after the heat-treatment. Two different steel were chosen because their composition differs enough to create very different properties. The first steel sample, steel 1018 (A36), is a low-carbon steel, consisting of less than 0.25% carbon and small but notable amounts of Manganese and Copper. 1 Moreover, the second steel sample is considered to be medium-carbon steel consisting of about 0.40% carbon and small but noteworthy amounts of nickel, chromium and molybdenum. On the other hand, aluminum 2024 is a wrought aluminum containing about 4% copper and small additions of magnesium and manganese. 2 Its high strength and relatively low density makes aluminum 2024 a common alloy used in airplane structures, rivets, truck wheels, and machine products. And last but not least, 70-30 (260) brass is not surprisingly about 30% zinc and 70% copper. 3 The compositions of each of the alloys used are important when considering the effects of the heat-treatment and are necessary for a complete analysis.
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