Welding Inspection & Metallurgy API ICP Self Study Notes

Quiz
1) See the figure below for possible solutions. The thought process behind
these is as follows:
a) 100% coarse pearlite: We want to keep the temperature above the nose of
the IT curve in order for the diffusion process to allow larger growth of the
eutectoid (pearlite) structure.
b) 100% tempered martensite: We want first to form 100% martensite, which
would be by cooling rapidly enough to miss the nose of the IT curve, and to
pass completely through the Mf temperature. Then perform a tempering heat
treatment at low temperatures for a short (1 hour) period of time.