ADVANCED MATSE 259 FINAL EXAM PREP WITH GRADE QUESTIONS AND ANSWERS

ADVANCED MATSE 259 FINAL EXAM PREP WITH GRADE QUESTIONS AND ANSWERS What is important in the Austenite -- Pearlite Transformation - Temperature, Rate of transformation (S-Curve) for a eutectoid alloy_______temp (decreased supercooling), _______ the rate of transformation - for a eutectoid alloy increasing temp (decreased supercooling), slows down the rate of transformation Austenite -- Pearlite transformation occurs only if an alloy is _______to a temp ______ the eutectoid. - Austenite -- Pearlite transformation occurs only if an alloy is supercooled to a temp below the eutectoid. Austenite -- Pearlite transformation at temps ______ the eutectoid, it takes a ______ time to reach 50% transformation. - Austenite -- Pearlite transformation at temps just below the eutectoid, it takes a longtime to reach 50% transformation. Austenite -- Pearlite transformation at higher levels of undercooling, the transformation occurs much more _______. - Austenite -- Pearlite transformation at higher levels of undercooling, the transformation occurs much more Rapidly. Coarse Pearlite at a temp just below the eutectoid, thick layers of ferrite and cementite form, and _____ diffusion allows C atoms to diffuse ______ distances and creates a _______ Lamellae. - Coarse Pearlite at a temp just below the eutectoid, thick layers of ferrite and cementite form, and high diffusion allows C atoms to diffuse long distances and creates a thick Lamellae. Pic Fine Pearlite at a temp just below the eutectoid, thin layers of ferrite and cementite form, and _____ diffusion allows C atoms to diffuse ______ distances and creates a _______ Lamellae. Forms at 540 degrees Celsius - Fine Pearlite at a temp just below the eutectoid, thin layers of ferrite and cementite form, and lower diffusion rates allows C atoms to diffuse short distances and creates a thin Lamellae. Forms at 540 degrees Celsius Pic