QUESTION 5 The slowest cooling rate that yields the maximum martensitic transformation is termed the OI. relative II. terminal III. curie IV. critical QUESTION 6 Choose the microconstituent product that is the most stable, moderately soft with good ductility. 1. spheroidite II. pearlite III. ferrite IV. bainite cooling rate. Martensite must be I. tempered II. quenched twice O III. carburized O IV. de-carburized QUESTION 8 so as to impart ductility/toughness prior to it being put into service. What BCT microconstituent structure has needle like grains and is very hard and very brittle? I. martensite II. millerlite III. cementite IV. bainite