HWCH11Spring - (a) 100% coarse pearlite. (b) 100% tempered...

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Homework Ch. 11 2 Introduction to Materials Science 11.1 Name the two stages involved in the formation of particles of a new phase. Briefly describe each. 11.6 (10.6) Below, the fraction recrystallized–time data for the recrystallization at 600oC of a previously deformed steel are tabulated. Assuming that the kinetics of this process obey the Avrami relationship, determine the fraction recrystallized after a total time of 22.8 min. 11.15 Make a copy of the isothermal transformation diagram for an iron– carbon alloy of eutectoid composition (Figure 11.14) and then sketch and label on this diagram time– temperature paths to produce the following microstructures:
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Unformatted text preview: (a) 100% coarse pearlite. (b) 100% tempered Martensite. (c) 50% coarse pearlite, 25% bainite, and 25% Martensite. 3 Introduction to Materials Science 11.29 Cite two reasons why martensite is so hard and brittle. 11.40 What is the principal difference between natural and artificial aging processes? 11.D8 (D9) A solution heat-treated 2014 aluminum alloy is to be precipitation hardened to have a minimum tensile strength of 450 MPa and a ductility of at least 15%EL. Specify a practical precipitation heat treatment in terms of temperature and time that would give these mechanical characteristics. Justify your answer. 4...
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HWCH11Spring - (a) 100% coarse pearlite. (b) 100% tempered...

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