Chapter10-2 - Chapter 10 Kinetics Heat Treatment Issues to...

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Unformatted text preview: Chapter 10 Kinetics Heat Treatment Issues to address Phase transformations take time to occur How does the rate of transformation depend on time and temperature? How does heat treatment affect microstructure? TTT Diagram Figure 10-11 Martensite Continuous Cooling Transformation Diagram Figure 10-14 TTT Diagram for a Hypereutectiod Composition igure 10-15 TTT diagram for a Hypoeutectiod Composition Figure 10-16 (a) (b) (c) (d) (e) (f) Small, thin pieces of 0.25mm thick hot-rolled strips of eutectoid steel are heated for 1h at 900C and then given the heat treatments shown in the following isothermal transformation diagram. Determine the microstructures of the samples after each heat treatment. 7 Isothermal Heat Treatment Example Problems On the isothermal transformation diagram for a 0.45 wt% C, Fe-C alloy, sketch and label the time-temperature paths to produce the following microstructures: a) 42% proeutectoid ferrite and 58% coarse pearlite b) 50% fine pearlite and 50% bainite c) 100% martensite d) 50% martensite and 50% austenite 8...
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This note was uploaded on 10/03/2011 for the course EMCH 371 taught by Professor Dai-hattrick during the Spring '11 term at South Carolina.

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Chapter10-2 - Chapter 10 Kinetics Heat Treatment Issues to...

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