首页|Characterization of age hardening mechanism of low-temperature aged low-carbon steel by transmission electron microscopy
Characterization of age hardening mechanism of low-temperature aged low-carbon steel by transmission electron microscopy
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NSTL
Elsevier
Low-temperature aging treatment at 323 K results in the dramatical increase in hardness in low-carbon ferritic steels quenched from 983 K, possibly caused by carbon clusters and/or fine epsilon-carbides. In this study, transmission electron microscopy (TEM) analysis was carried out to characterize the change of the microstructure during the low-temperature aging treatment. Until the early stage of the peak hardness, the carbon clusters were formed homogeneously with zig-zag structures. At the latter stage of the peak hardness, it was found that the epsilon-carbides were partially precipitated within the carbon clusters, which suggested that the carbon clusters might have acted as the precursors of epsilon-carbides. In-situ tensile TEM observations showed that dislocation motions were free-glide type, and carbon clusters and fine-carbides interacted with dislocations via cutting-type. Dislocation interaction force was also evaluated, which suggested that the lattice misfit played as important role of the interaction mechanism.
Low-carbon steelCarbon clusterCarbideDislocation-obstacle interactionTransmission electron microscopyIn -situ tensile TEM experimentsSITU TEM OBSERVATIONIN-SITUCARBIDE PRECIPITATIONDISLOCATION MOVEMENTIRONMICROSTRUCTUREMARTENSITE
NSTL
Elsevier
