MSELAB5 - Chase Machemehl MSE 150L Phase Equlibria The...

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Chase Machemehl MSE 150L Phase Equlibria 4-14-06
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The purpose of this laboratory experiment was to analyze the lead-tin equilibrium, creating a equilibrium phase diagram and relating it to a binary system. A carbon steel sample was polished and etched in order to show the distribution at the microscopic level in equilibrium. Also, a cooling curve was established for varying concentrations of lead-tin mixes. Procedure Composed of three parts, the experiment aimed to establish a lead tin-phase diagram cooling curve, identify the composition of steel samples by comparing the metallography of etched and polished samples to the equilibrium phase diagram, and measure the profile of a Jominy bar test with 4140 and 1045 steels. First, seven different samples of lead-tin, ranging from 100% lead to 100% tin, were heated and then cooled while being monitored with labview to determine their temperatures of phase change. Second, a carbon steel sample was polished and etched with a 2% Nitol solution. Last, two samples, 4140 and 1045 steel, were hardness tested on the Rockwell-C hardness machine after undergoing Jominy bar end-quench hardening. Hardness was taken at 1mm intervals for the first 2cm, and then 2mm intervals for the latter 2cm. Results
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MSELAB5 - Chase Machemehl MSE 150L Phase Equlibria The...

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