Exam (elaborations)
Heating TTT Questions with Solutions
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Exam of 3 pages for the course TTT at TTT (Heating TTT)
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Heating TTT1. Heat to hold to form 100% Austenite - answer(T > T Eutectoid)
2. Cool to temp that allows production of desired alloy. - answer Perlite - 720C to 540C
Banite - 540C to 250C
3. What to do to produce desired microstructure? - answer Hold alloy at chosen temp
for specific time to produce desired microstructures
4. How to retain the microstructure - answer Cool to room temperature
TTT curve - answer Time-Temperature-Transformation shows how cooling rate affects
the transformation of austenite into various possible phases.
Various phases for transformation of austenite - answer1. Alternative forms of ferrite
and cementite
2.Alternative forms martensite
Bainite - answerA mixture of ferrite and small particles of Fe3C produced by the
decomposition of austenite.
Bainite - answerIs an alternative mixture of the same phases that is produced by initial
rapid cooling to a temperature somewhat above Ms
Bainite - answerHas a fine dispersion of carbide, its strength exceeds that of fine
pearlite, and its ductility is retained because the soft ferrite is the continuous matrix.
Martensite - answerIf cooling occurs at a sufficiently rapid rate , austenite is transformed
into martensite
Martensite - answerNonequilibrium product of steel formed by the diffusionless
transformation of austenite.
Cooling phase of martensite - answerThe martensite transformation begins at a certain
temperature Ms and finishes at a lower temperature Mf
What happens at Ms and Mf? - answerAt points between these two levels, the steel is a
mixture of austenite and martensite
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