Chap 10 Solns-6E - CHAPTER 10 PHASE TRANSFORMATIONS IN...

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CHAPTER 10 PHASE TRANSFORMATIONS IN METALS PROBLEM SOLUTIONS 10.11 We are called upon to consider the isothermal transformation of an iron-carbon alloy of eutectoid composition. (a) From Figure 10.13, a horizontal line at 550 ° C intersects the 50% and reaction completion curves at about 2.5 and 6 seconds, respectively; these are the times asked for in the problem. (b) The pearlite formed will be fine pearlite. From Figure 10.21(a), the hardness of an alloy of composition 0.76 wt% C that consists of fine pearlite is about 265 HB (27 HRC). 10.14 This problem asks us to determine the nature of the final microstructure of an iron-carbon alloy of eutectoid composition, that has been subjected to various isothermal heat treatments. Figure 10.13 is used in these determinations. (a) 50% coarse pearlite and 50% martensite (b) 100% spheroidite (c) 50% fine pearlite, 25% bainite , and 25% martensite (d) 100% martensite (e) 40% bainite and 60% martensite (f) 100% bainite (g) 100% fine pearlite (h)
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This note was uploaded on 08/30/2011 for the course EGN 3365 taught by Professor Staff during the Spring '11 term at University of Florida.

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Chap 10 Solns-6E - CHAPTER 10 PHASE TRANSFORMATIONS IN...

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