Briefly describe the simplest continuouscooling heat treatment procedure that would be used in converting a 4340 steel from one microstructure to another.
(a) (Martensite + ferrite + bainite) to (martensite + ferrite + pearlite + bainite)
(b) (Martensite + ferrite + bainite) to spheroidite
(c) (Martensite + bainite + ferrite) to tempered martensite
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