Abstract
Summary This study shows that the microstructure of quenched plates of modified A710 steel is characterized by laths of ferrite, which have a very similar crystallographic orientation within each packet, and interlath particles of martensite and/or austenite. This structure is thus consistent with the multiphase structures termed granular bainite (13). The volume fraction of the second-phase particles is about 0.15, about half austenite and half martensite. During aging at 604°C, a small amount of austenite transforms to cementite. It is suggested that the nature of the second-phase particles may have a profound influence on the toughness of these and similar steels.
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