800 Eutectoid temperature 700 A 4. Using the isothermal time-temperature transformation diagram, determine the nature of

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800 Eutectoid Temperature 700 A 4 Using The Isothermal Time Temperature Transformation Diagram Determine The Nature Of 1 (129.02 KiB) Viewed 17 times

800 Eutectoid temperature 700 A 4. Using the isothermal time-temperature transformation diagram, determine the nature of the final microstructure in terms of micro-constituents present and their approximate percentages of the following three heat treatments represented. In each case, assume that the specimen begins at 760°C and that it has been held at this temperature long time enough to have achieved a complete and homogeneous & austenitic structure. (15 pts) 600 500 B Temperature (°C) 400 Solution: A 300 a) 100% Pfine M (start) 200 M + 50% b) 100% tempered M c) 25% B, 25% m, 50% Pcoarse M (50%) M (90%) 100 100% tempered M 0 25% B, 25% M, 50% coarle P 100% fine P Me) (a) 1 10 102 103 Time (s) 10-1 104 105