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Abstract
Dual phase microstructures with various ferrite grain sizes and martensite fractions were obtained by a variety of heat treatment conditions on the as-received cold rolled sheet steels. The static (0.01 mm/s) and dynamic (25 m/s) mechanical properties of various microstructures were measured by means of shear punch testing. It was found that both static and dynamic strengths decreased with the increase of ferrite grain size. It was also observed that variation of the dynamic factor with static strength was independent of grain size, but a higher alloying level gave higher dynamic factor values.
Dual phase microstructures with various ferrite grain sizes and martensite fractions were obtained by a variety of heat treatment conditions on the as-received cold rolled sheet steels. The static (0.01 mm/s) and dynamic (25 m/s) mechanical properties of various microstructures were measured by means of shear punch testing. It was found that both static and dynamic strengths decreased with the increase of ferrite grain size. It was also observed that variation of the dynamic factor with static strength was independent of grain size, but a higher alloying level gave higher dynamic factor values.
On a obtenu des microstructures biphases à tailles de grains de ferrite et de fractions de martensite variées au moyen d'une variété de traitements thermiques pour des tôles d'acier laminées à froid telles quelles. On a mesuré les propriétés mécaniques statiques (0.01mm/s) et dynamiques (25 m/s) des diverses microstructures, au moyen d'un essai au poinçon. On a trouvé que les résistances tant statique que dynamique diminuaient avec l'augmentation de la taille du grain de ferrite. On a également observé que la variation du facteur dynamique en fonction de la résistance statique était indépendante de la taille de grain mais qu'un niveau plus élevé d'éléments d'alliage donnait des valeurs plus élevées du facteur dynamique.