#69 Make a copy of the isothermal transformation diagram

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Question

#69 Make a copy of the isothermal transformation diagram for an iron–carbon alloy of eutectoid composition (Figure 10.22) and then sketch and label time–temperature paths on this diagram to produce the following microstructures:

(a) 100% coarse pearlite
(b) 50% martensite and 50% austenite
(c) 50% coarse pearlite, 25% bainite, and 25% martensite

Figure 10.22 The complete isothermal transformation diagram for an iron–carbon alloy of eutectoid composition: A, austenite; B, bainite; M, martensite; P, pearlite.

Answer

Draw the isothermal transformation diagram for an iron-carbon alloy of eutectoid composition showing the given composition on it.