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Review for test 3 - Eutectic if it has liquid at the top...

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Picture 1 Picture 2 Picture 3 Picture 4 Picture 5 Picture 6 Picture 7 Picture 8 Picture 9 Picture 10 Picture 11 Picture 12 Review Thursday, November 04, 2010 10:34 AM Which is better hard or ductile matrix? Ductile matrix Particles should be nice rounded because of stress concentrations. Good dispersion of fine particles works better First step of precipitation hardness is solutionize. by heating the single phased region. To alpha. Then you quench to give a super saturated alpha. Then you age which is reheating to form small coherent theta particles Curve of time vs. hardness
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Unformatted text preview: Eutectic if it has liquid at the top its eutectoid Time Hardness Red = over aging but a low temp The blue is a higher temp but low hardening Know pearlite. If you take a steel from high temp (gamma) to a bucket of water you'll get marten site. Which is hard and brittle. You then heat it (called tempering) to fix the brittleness. Process Anneal Annealing- From gamma to furnace cool Normalizing- form gamma to air cool Spheroid zing heat to below Eutectoid. Forms round spheres Stainless steel add chromium oxide to prevent corrosion...
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