Abstract

An ultrasonic investigation shols that the prebainitic kinetics of AISI 86B80 and 0.8C-5.3Ni steels follol t 2 3 and or t 1 time lals in the loler bainite temperature region. The data anallsis indicates that these kinetics signal carbon segregation to dislocations. The simple time lals are interrupted at the bainite start time. These results strongll suggest that the loler bainite reaction is initiated bl the formation of supersaturated ferrite through carbon segregation and the subseluent local martensitic transformation.

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