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Old 06-11-2006, 10:23 AM
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Shade Tree Welder Shade Tree Welder is offline
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Default Transformation Diagrams (One Minute Mentor)

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June 9, 2006
Transformation Diagrams

Transformation diagrams are used to describe what happens during phase transformations in steel upon heating and cooling. Four types of transformation diagrams are isothermal transformation diagrams to describe the formation of austenite (ITh diagrams); isothermal transformation (IT) diagrams or time-temperature-transformation (TTT) diagrams to describe the decomposition of austenite; continuous heating transformation (CHT) diagrams; and continuous cooling transformation (CCT) diagrams. An isothermal transformation diagram shows what happens when steel is held at a constant temperature for a prolonged period of time. One way to follow the development of the microstructure with time is to hold small specimens at a constant temperature, then quench them one at a time after increasing holding times, and view the amount of phases formed. An alternative method uses a single specimen and a dilatometer, which records specimen elongation as a function of time.
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Last edited by Shade Tree Welder; 06-11-2006 at 11:22 AM.
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Old 06-11-2006, 10:57 AM
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I think I know what a dilatometer is used for..

(see, I did read what ya writ..)
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Old 06-27-2006, 06:58 PM
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AH soph year of college, and Natures of Materials class... good stuff
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