Assignment 3

Assignment 3 - Specify a practical precipitation heat...

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1 of 2 FACULTY OF ENGINEERING AND APPLIED SCIENCE ENGR 4250 - Advanced Materials Engineering Instructor: Dr. Ali Keshavarz TA: Maryam Talimi ASSIGNMENT # Due Date: Thursday, March 03, 2011 by NOON. Please submit your assignment with this cover page by noon to drop-box #3 located on ground floor OPG Building. Question 1 2 3 4 5 Total Mark NAME: ID: 3

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2 of 2 Chapter 11 Q1: Compute the volume percent of graphite V Gr in a 3.5 wt% C cast iron, assuming that all the carbon exists as the graphite phase. Assume densities of 7.9 and 2.3 g/cm 3 for ferrite and graphite, respectively. Q2: Compare the effectiveness of quenching in moderately agitated water and oil by graphing, on a single plot, radial hardness profiles for 65-mm (2 1 2 -in.) diameter cylindrical specimens of an 8630 steel that have been quenched in both media. Hint: See Figures 11.17a and 11.15 Q3: A solution heat-treated 2014 aluminum alloy is to be precipitation hardened to have a minimum tensile strength of 450 MPa (65,250 psi) and a ductility of at least 15%EL.
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Unformatted text preview: Specify a practical precipitation heat treatment in terms of temperature and time that would give these mechanical characteristics. Justify your answer. Hint: See Figures 11.27a Chapter 12 Q4: The modulus of elasticity for beryllium oxide (BeO) having 5 vol% porosity is 310 GPa (45 × 10 6 (a) Compute the modulus of elasticity for the nonporous material. psi). (b) Compute the modulus of elasticity for 10 vol% porosity. Chapter 13 Q5: The viscosity η of a glass varies with temperature according to the relationship η= A exp Q vis RT where Q vis is the energy of activation for viscous flow, A is a temperature-independent constant, and R and T are, respectively, the gas constant and the absolute temperature. A plot of ln η versus l/ T should be nearly linear, and with a slope of Q vis (a) make such a plot for the borosilicate glass, and /R . Using the data in Figure 13.7, (b) determine the activation energy between temperatures of 500 and 900°C....
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• Spring '08
• Brenan
• Tensile strength, Advanced Materials Engineering, moderately agitated water, Dr. Ali Keshavarz, Maryam Talimi, ground floor OPG

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Assignment 3 - Specify a practical precipitation heat...

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