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Abstract
An ultrafine grained Nb microalloyed steel was produced by cold rolling of martensite followed by annealing heat treatments at different times to study its effect on the microstructure and mechanical behaviour of the ultrafine grained steel. High strength was achieved by this thermomechanical processing due to the formation of cell and subgrain dislocation substructure; however annealing reduced both strength and elongation.
An ultrafine grained Nb microalloyed steel was produced by cold rolling of martensite followed by annealing heat treatments at different times to study its effect on the microstructure and mechanical behaviour of the ultrafine grained steel. High strength was achieved by this thermomechanical processing due to the formation of cell and subgrain dislocation substructure; however annealing reduced both strength and elongation.
On a produit un acier à grains ultrafins, microallié au Nb, par laminage à froid de la martensite, suivi par des traitements de recuit de différentes durées pour étudier leurs effets sur la microstructure et le comportement mécanique de cet acier. On a obtenu une résistance élevée par ce traitement thermomécanique grâce à la formation de cellule et de sous-structure de dislocation de sousgrain; cependant, le trempage réduisait tant la résistance que l’élongation.
