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Quiz 7 (TTT) Questions and Answers Fully Solved
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Exam of 3 pages for the course TTT at TTT (Quiz 7 (TTT))
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Quiz 7 (TTT)Austenite ->slow cooling - answer Pearlite + a proeutectoid phase
Austenite ->moderate cooling - answer Bainite
Austenite ->rapid quench - answer Martensite
Softest structure. Good for machining. – answer Spherulite
Most stable structure. Moderately soft. Good ductility - answer Pearlite
Intermediate hardness & strength. Maintains ductility. - answer Bainite
Very high hardness & strength. Very brittle & NO ductility. Requires tempering to be
useful. - answer Martensite
Shear transformation (shearing action).
From FCC lattice to a BCT (body centered tetragonal) lattice. Single Phase. Needle-
shaped grains - answer Martensite
Diffusionless process - answerMartensite
________ are not time dependent they are temperature dependent. - answerThermal
Transformation Diagram
relatively small Fe3C spherlike particles in an aplha-ferite matrix - answerSpheroidite
Alternating layers of aplha-ferrite and Fe3C that are relatively thick - answerCoarse
Pearlite
Alternating layers of aplha-ferrite and Fe3C that are relatively thin - answerFine Pearlite
Very fine and elongated particles of Fe3C in an aplha ferrite matrix - answerBainite
Steel with 0.8% carbon has a 100% microstructure called ___________ and is referred
to as ________________ steel. - answermartenstic, hypereutectoid
The process of heating a steel to it's proper heating temperature _________________ -
answer(austentizing)
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