Practice3

# Practice3 - ME 083 Spring 2001 Structure and Properties of...

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ME 083 Spring 2001 Structure and Properties of Solids Practice Exam #3 April 3, 2002 Problem 1: Microstructure Thin strips of AISI 1045 steel are heated into the austenite region and allowed to come to equilibrium. Sketch and label the the resulting microstructure of the samples, and calculate the weight fraction of each phase if the steel is: (a) furnace cooled to room temperature (b) quenched rapidly to room temperature 1

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(c) quenched rapidly to room temperature and then heated to just below the eutectoid tem- perature and held for a long time before slow cooling to room temperature Problem 2: Microstructure On the axes below, draw a schematic TTT diagram for a plain carbon steel containing 0.45 wt% carbon. The eutectoid temperature as well as M s and M f temperatures are shown on the graph. The nose of the curve is at 0.5 s and 580 o C. Be sure to label all transformations. Time [ sec ] 0.1 1 10 100 1000 Temperature [ o C ] 0 200 400 600 800 1000 M s M f Figure 1: TTT diagram for plain carbon steel containing 0.45 wt% C.
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Practice3 - ME 083 Spring 2001 Structure and Properties of...

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