(j) Why does the nose region in atime-temperature-transformation (TTT) diagram have the shortesttransformation beginning and ending time?...
Question:
(j) Why does the “nose” region in atime-temperature-transformation (TTT) diagram have the shortesttransformation beginning and ending time? (k) Is bainite atwo-phase alloy? If so, what are they?
(l) Why is fine pearlite stronger but less ductile than coursepearlite? Why is lower bainite stronger but less ductile than upperbainite?
(m)In a continues-cooling transformation (CCT) diagram, why arethe two C-shaped curves shifted rightwards? Why are the lowerportion of the two C-shaped curves removed?
(n) What is the difference between tempered martensite andmar-tempering heat treatment?
(o) What is the difference between hardness and hardenability ofmetals?
(p) How and why does % carbon affect the hardness achievable inquenching of steels?
(q) Why do alloying elements improve hardenability ofsteels?
(r) Why are stainless steels of 200-300 series non-magnetic andcalled austenitic, while stainless steels of 400-500 series calledferritic or martensitic?
(s) What crystal structure does Ti have at room temperature? Whycan adding Cr or Mo to Ti produce a two phase structure (?+?) atroom temperature?
OM operations management
ISBN: 978-1285451374
5th edition
Authors: David Alan Collier, James R. Evans