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(a)(b)(c)(d)Figure 4: Samples tempered at 753 ◦ Cforavariety<strong>of</strong>timeperiods. Thesymbolsα, α ′ , θ <strong>and</strong>Pst<strong>and</strong>forferrite,martensite,cementite<strong>and</strong>pearliterespectively. (a) After 30 min, showing theprecipitation <strong>of</strong> carbides. (b) After 12 h, with austenite (now α ′ )formation<strong>and</strong>dissolution<strong>of</strong>somecarbides. (c) After 20 days <strong>of</strong> tempering. (d) After 42 days <strong>of</strong> tempering.9
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